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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@6319 a592a061-630c-0410-9148-cb99ea01b6c8
1438 lines
52 KiB
C++
1438 lines
52 KiB
C++
// (C) Copyright David Abrahams 2000. Permission to copy, use,
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// modify, sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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//
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// (C) Copyright Jeremy Siek 2000. Permission to copy, use, modify,
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// sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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// See http://www.boost.org/libs/utility/iterator_adaptors.htm for documentation.
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// Revision History:
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// 01 Feb 2002 Jeremy Siek
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// Added more comments in default_iterator_policies.
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// 08 Jan 2001 David Abrahams
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// Moved concept checks into a separate class, which makes MSVC
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// better at dealing with them.
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// 07 Jan 2001 David Abrahams
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// Choose proxy for operator->() only if the reference type is not a reference.
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// Updated workarounds for __MWERKS__ == 0x2406
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// 20 Dec 2001 David Abrahams
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// Adjusted is_convertible workarounds for __MWERKS__ == 0x2406
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// 03 Nov 2001 Jeremy Siek
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// Changed the named template parameter interface and internal.
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// 04 Oct 2001 Jeremy Siek
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// Changed projection_iterator to not rely on the default reference,
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// working around a limitation of detail::iterator_traits.
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// 04 Oct 2001 David Abrahams
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// Applied indirect_iterator patch from George A. Heintzelman <georgeh@aya.yale.edu>
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// Changed name of "bind" to "select" to avoid problems with MSVC.
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// 26 Sep 2001 David Abrahams
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// Added borland bug fix
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// 08 Mar 2001 Jeremy Siek
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// Added support for optional named template parameters.
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// 19 Feb 2001 David Abrahams
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// Rolled back reverse_iterator_pair_generator again, as it doesn't
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// save typing on a conforming compiler.
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// 18 Feb 2001 David Abrahams
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// Reinstated reverse_iterator_pair_generator
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// 16 Feb 2001 David Abrahams
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// Add an implicit conversion operator to operator_arrow_proxy
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// as CW and BCC workarounds.
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// 11 Feb 2001 David Abrahams
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// Switch to use of BOOST_STATIC_CONSTANT where possible
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// 11 Feb 2001 Jeremy Siek
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// Removed workaround for older MIPSpro compiler. The workaround
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// was preventing the proper functionality of the underlying
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// iterator being carried forward into the iterator adaptor.
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// Also added is_bidirectional enum to avoid EDG compiler error.
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// 11 Feb 2001 David Abrahams
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// Borland fixes up the wazoo. It finally works!
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// 10 Feb 2001 David Abrahams
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// Removed traits argument from iterator_adaptor<> and switched to
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// explicit trait specification for maximum ease-of-use.
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// Added comments to detail::iterator_defaults<>
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// Began using detail::iterator_defaults<> unconditionally for code clarity
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// Changed uses of `Iterator' to `Base' where non-iterators can be used.
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//
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// 10 Feb 2001 David Abrahams
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// Rolled in supposed Borland fixes from John Maddock, but not seeing any
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// improvement yet
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// Changed argument order to indirect_ generator, for convenience in the
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// case of input iterators (where Reference must be a value type).
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// Removed derivation of filter_iterator_policies from
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// default_iterator_policies, since the iterator category is likely to be
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// reduced (we don't want to allow illegal operations like decrement).
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// Support for a simpler filter iterator interface.
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//
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// 09 Feb 2001 David Abrahams
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// Improved interface to indirect_ and reverse_ iterators
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// Rolled back Jeremy's new constructor for now; it was causing
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// problems with counting_iterator_test
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// Attempted fix for Borland
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//
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// 09 Feb 2001 Jeremy Siek
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// Added iterator constructor to allow const adaptor
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// from non-const adaptee.
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// Changed make_xxx to pass iterators by-value to
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// get arrays converted to pointers.
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// Removed InnerIterator template parameter from
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// indirect_iterator_generator.
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// Rearranged parameters for make_filter_iterator
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//
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// 07 Feb 2001 Jeremy Siek
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// Removed some const iterator adaptor generators.
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// Added make_xxx_iterator() helper functions for remaining
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// iterator adaptors.
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// Removed some traits template parameters where they
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// where no longer needed thanks to detail::iterator_traits.
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// Moved some of the compile-time logic into enums for
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// EDG compatibility.
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//
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// 07 Feb 2001 David Abrahams
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// Removed iterator_adaptor_pair_generator and
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// reverse_iterator_pair_generator (more such culling to come)
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// Improved comments
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// Changed all uses of std::iterator_traits as default arguments
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// to boost::detail::iterator_traits for improved utility in
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// non-generic contexts
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// Fixed naming convention of non-template parameter names
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//
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// 06 Feb 2001 David Abrahams
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// Produce operator-> proxy objects for InputIterators
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// Added static assertions to do some basic concept checks
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// Renamed single-type generators -> xxx_generator
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// Renamed const/nonconst iterator generators -> xxx_pair_generator
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// Added make_transform_iterator(iter, function)
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// The existence of boost::detail::iterator_traits allowed many
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// template arguments to be defaulted. Some arguments had to be
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// moved to accomplish it.
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//
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// 04 Feb 2001 MWERKS bug workaround, concept checking for proper
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// reference types (David Abrahams)
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#ifndef BOOST_ITERATOR_ADAPTOR_DWA053000_HPP_
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# define BOOST_ITERATOR_ADAPTOR_DWA053000_HPP_
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# include <boost/iterator.hpp>
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# include <boost/utility.hpp>
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# include <boost/compressed_pair.hpp>
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# include <boost/concept_check.hpp>
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# include <boost/type.hpp>
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# include <boost/static_assert.hpp>
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# include <boost/type_traits.hpp>
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# include <boost/type_traits/conversion_traits.hpp>
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# include <boost/detail/iterator.hpp>
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# include <boost/detail/select_type.hpp>
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# include <boost/detail/workaround.hpp>
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# if BOOST_WORKAROUND(__GNUC__, == 2) && __GNUC_MINOR__ <= 96 && !defined(__STL_USE_NAMESPACES)
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# define BOOST_RELOPS_AMBIGUITY_BUG 1
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# endif
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namespace boost {
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//============================================================================
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// Concept checking classes that express the requirements for iterator
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// policies and adapted types. These classes are mostly for
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// documentation purposes, and are not used in this header file. They
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// merely provide a more succinct statement of what is expected of the
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// iterator policies.
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template <class Policies, class Adapted, class Traits>
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struct TrivialIteratorPoliciesConcept
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{
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typedef typename Traits::reference reference;
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void constraints() {
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function_requires< AssignableConcept<Policies> >();
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function_requires< DefaultConstructibleConcept<Policies> >();
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function_requires< AssignableConcept<Adapted> >();
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function_requires< DefaultConstructibleConcept<Adapted> >();
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const_constraints();
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}
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void const_constraints() const {
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reference r = p.dereference(x);
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b = p.equal(x, x);
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ignore_unused_variable_warning(r);
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}
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Policies p;
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Adapted x;
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mutable bool b;
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};
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// Add InputIteratorPoliciesConcept?
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template <class Policies, class Adapted, class Traits>
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struct ForwardIteratorPoliciesConcept
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{
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typedef typename Traits::iterator_category iterator_category;
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void constraints() {
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function_requires<
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TrivialIteratorPoliciesConcept<Policies, Adapted, Traits>
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>();
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p.increment(x);
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std::forward_iterator_tag t = iterator_category();
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ignore_unused_variable_warning(t);
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}
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Policies p;
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Adapted x;
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iterator_category category;
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};
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template <class Policies, class Adapted, class Traits>
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struct BidirectionalIteratorPoliciesConcept
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{
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typedef typename Traits::iterator_category iterator_category;
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void constraints() {
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function_requires<
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ForwardIteratorPoliciesConcept<Policies, Adapted, Traits>
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>();
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p.decrement(x);
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std::bidirectional_iterator_tag t = iterator_category();
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ignore_unused_variable_warning(t);
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}
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Policies p;
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Adapted x;
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};
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template <class Policies, class Adapted, class Traits>
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struct RandomAccessIteratorPoliciesConcept
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{
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typedef typename Traits::difference_type DifferenceType;
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typedef typename Traits::iterator_category iterator_category;
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void constraints() {
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function_requires<
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BidirectionalIteratorPoliciesConcept<Policies, Adapted, Traits>
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>();
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p.advance(x, n);
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std::random_access_iterator_tag t = iterator_category();
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const_constraints();
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ignore_unused_variable_warning(t);
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}
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void const_constraints() const {
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n = p.distance(x, x);
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}
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Policies p;
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Adapted x;
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mutable DifferenceType n;
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mutable bool b;
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};
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//============================================================================
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// Default policies for iterator adaptors. You can use this as a base
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// class if you want to customize particular policies.
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struct default_iterator_policies
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{
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// Some of the member functions were defined static, but Borland
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// got confused and thought they were non-const. Also, Sun C++
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// does not like static function templates.
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//
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// The reason some members were defined static is because there is
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// not state (data members) needed by those members of the
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// default_iterator_policies class. If your policies class member
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// functions need to access state stored in the policies object,
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// then the member functions should not be static (they can't be).
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template <class Base>
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void initialize(Base&)
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{ }
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template <class IteratorAdaptor>
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typename IteratorAdaptor::reference dereference(const IteratorAdaptor& x) const
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{ return *x.base(); }
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template <class IteratorAdaptor>
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void increment(IteratorAdaptor& x)
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{ ++x.base(); }
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template <class IteratorAdaptor>
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void decrement(IteratorAdaptor& x)
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{ --x.base(); }
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template <class IteratorAdaptor, class DifferenceType>
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void advance(IteratorAdaptor& x, DifferenceType n)
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{ x.base() += n; }
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template <class IteratorAdaptor1, class IteratorAdaptor2>
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typename IteratorAdaptor1::difference_type
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distance(const IteratorAdaptor1& x, const IteratorAdaptor2& y) const
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{ return y.base() - x.base(); }
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template <class IteratorAdaptor1, class IteratorAdaptor2>
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bool equal(const IteratorAdaptor1& x, const IteratorAdaptor2& y) const
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{ return x.base() == y.base(); }
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};
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// putting the comparisons in a base class avoids the g++
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// ambiguous overload bug due to the relops operators
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#ifdef BOOST_RELOPS_AMBIGUITY_BUG
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template <class Derived, class Base>
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struct iterator_comparisons : Base { };
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template <class D1, class D2, class Base1, class Base2>
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inline bool operator==(const iterator_comparisons<D1,Base1>& xb,
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const iterator_comparisons<D2,Base2>& yb)
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{
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const D1& x = static_cast<const D1&>(xb);
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const D2& y = static_cast<const D2&>(yb);
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return x.policies().equal(x, y);
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}
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template <class D1, class D2, class Base1, class Base2>
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inline bool operator!=(const iterator_comparisons<D1,Base1>& xb,
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const iterator_comparisons<D2,Base2>& yb)
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{
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const D1& x = static_cast<const D1&>(xb);
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const D2& y = static_cast<const D2&>(yb);
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return !x.policies().equal(x, y);
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}
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template <class D1, class D2, class Base1, class Base2>
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inline bool operator<(const iterator_comparisons<D1,Base1>& xb,
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const iterator_comparisons<D2,Base2>& yb)
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{
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const D1& x = static_cast<const D1&>(xb);
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const D2& y = static_cast<const D2&>(yb);
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return x.policies().distance(y, x) < 0;
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}
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template <class D1, class D2, class Base1, class Base2>
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inline bool operator>(const iterator_comparisons<D1,Base1>& xb,
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const iterator_comparisons<D2,Base2>& yb)
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{
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const D1& x = static_cast<const D1&>(xb);
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const D2& y = static_cast<const D2&>(yb);
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return x.policies().distance(y, x) > 0;
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}
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template <class D1, class D2, class Base1, class Base2>
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inline bool operator>=(const iterator_comparisons<D1,Base1>& xb,
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const iterator_comparisons<D2,Base2>& yb)
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{
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const D1& x = static_cast<const D1&>(xb);
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const D2& y = static_cast<const D2&>(yb);
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return x.policies().distance(y, x) >= 0;
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}
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template <class D1, class D2, class Base1, class Base2>
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inline bool operator<=(const iterator_comparisons<D1,Base1>& xb,
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const iterator_comparisons<D2,Base2>& yb)
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{
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const D1& x = static_cast<const D1&>(xb);
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const D2& y = static_cast<const D2&>(yb);
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return x.policies().distance(y, x) <= 0;
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}
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#endif
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namespace detail {
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// operator->() needs special support for input iterators to strictly meet the
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// standard's requirements. If *i is not a reference type, we must still
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// produce a (constant) lvalue to which a pointer can be formed. We do that by
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// returning an instantiation of this special proxy class template.
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template <class T>
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struct operator_arrow_proxy
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{
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operator_arrow_proxy(const T& x) : m_value(x) {}
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const T* operator->() const { return &m_value; }
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// This function is needed for MWCW and BCC, which won't call operator->
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// again automatically per 13.3.1.2 para 8
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operator const T*() const { return &m_value; }
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T m_value;
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};
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template <class Iter>
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inline operator_arrow_proxy<typename Iter::value_type>
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operator_arrow(const Iter& i, std::input_iterator_tag) {
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typedef typename Iter::value_type value_t; // VC++ needs this typedef
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return operator_arrow_proxy<value_t>(*i);
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}
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template <class Iter>
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inline typename Iter::pointer
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operator_arrow(const Iter& i, std::forward_iterator_tag) {
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return &(*i);
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}
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template <class Value, class Reference, class Pointer>
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struct operator_arrow_result_generator
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{
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typedef operator_arrow_proxy<Value> proxy;
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// Borland chokes unless it's an actual enum (!)
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enum { use_proxy = !boost::is_reference<Reference>::value };
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typedef typename boost::detail::if_true<(use_proxy)>::template
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then<
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proxy,
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// else
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Pointer
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>::type type;
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};
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# if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) || defined(BOOST_NO_STD_ITERATOR_TRAITS)
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// Select default pointer and reference types for adapted non-pointer
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// iterators based on the iterator and the value_type. Poor man's partial
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// specialization is in use here.
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template <bool is_pointer>
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struct iterator_defaults_select
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{
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template <class Iterator,class Value>
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struct traits
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{
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// The assumption is that iterator_traits can deduce these types
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// properly as long as the iterator is not a pointer.
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typedef typename boost::detail::iterator_traits<Iterator>::pointer pointer;
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typedef typename boost::detail::iterator_traits<Iterator>::reference reference;
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};
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};
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// Select default pointer and reference types for adapted pointer iterators
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// given a (possibly-const) value_type.
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template <>
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struct iterator_defaults_select<true>
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{
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template <class Iterator,class Value>
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struct traits
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{
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typedef Value* pointer;
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typedef Value& reference;
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};
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};
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// Consolidate selection of the default pointer and reference type
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template <class Iterator,class Value>
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struct iterator_defaults
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{
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BOOST_STATIC_CONSTANT(bool, is_ptr = boost::is_pointer<Iterator>::value);
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typedef typename iterator_defaults_select<is_ptr>::template traits<Iterator,Value> traits;
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typedef typename traits::pointer pointer;
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typedef typename traits::reference reference;
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};
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# else
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template <class Iterator,class Value>
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struct iterator_defaults : iterator_traits<Iterator>
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{
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// Trying to factor the common is_same expression into an enum or a
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// static bool constant confused Borland.
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typedef typename if_true<(
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::boost::is_same<Value,typename iterator_traits<Iterator>::value_type>::value
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)>::template then<
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typename iterator_traits<Iterator>::pointer,
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Value*
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>::type pointer;
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typedef typename if_true<(
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::boost::is_same<Value,typename iterator_traits<Iterator>::value_type>::value
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)>::template then<
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typename iterator_traits<Iterator>::reference,
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Value&
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>::type reference;
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};
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# endif
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//===========================================================================
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// Specify the defaults for iterator_adaptor's template parameters
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struct default_argument { };
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// This class template is a workaround for MSVC.
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struct dummy_default_gen {
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template <class Base, class Traits>
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struct select { typedef default_argument type; };
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};
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// This class template is a workaround for MSVC.
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template <class Gen> struct default_generator {
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typedef dummy_default_gen type;
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};
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struct default_value_type {
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template <class Base, class Traits>
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struct select {
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typedef typename boost::detail::iterator_traits<Base>::value_type type;
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};
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};
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template <> struct default_generator<default_value_type>
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{ typedef default_value_type type; }; // VC++ workaround
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struct default_difference_type {
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template <class Base, class Traits>
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struct select {
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typedef typename boost::detail::iterator_traits<Base>::difference_type type;
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};
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};
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template <> struct default_generator<default_difference_type>
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{ typedef default_difference_type type; }; // VC++ workaround
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struct default_iterator_category {
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template <class Base, class Traits>
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struct select {
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typedef typename boost::detail::iterator_traits<Base>::iterator_category type;
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};
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};
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template <> struct default_generator<default_iterator_category>
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{ typedef default_iterator_category type; }; // VC++ workaround
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struct default_pointer {
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template <class Base, class Traits>
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struct select {
|
|
typedef typename Traits::value_type Value;
|
|
typedef typename boost::detail::iterator_defaults<Base,Value>::pointer
|
|
type;
|
|
};
|
|
};
|
|
template <> struct default_generator<default_pointer>
|
|
{ typedef default_pointer type; }; // VC++ workaround
|
|
|
|
struct default_reference {
|
|
template <class Base, class Traits>
|
|
struct select {
|
|
typedef typename Traits::value_type Value;
|
|
typedef typename boost::detail::iterator_defaults<Base,Value>::reference
|
|
type;
|
|
};
|
|
};
|
|
template <> struct default_generator<default_reference>
|
|
{ typedef default_reference type; }; // VC++ workaround
|
|
|
|
} // namespace detail
|
|
|
|
|
|
//===========================================================================
|
|
// Support for named template parameters
|
|
|
|
struct named_template_param_base { };
|
|
|
|
namespace detail {
|
|
struct value_type_tag { };
|
|
struct reference_tag { };
|
|
struct pointer_tag { };
|
|
struct difference_type_tag { };
|
|
struct iterator_category_tag { };
|
|
|
|
// avoid using std::pair because A or B might be a reference type, and g++
|
|
// complains about forming references to references inside std::pair
|
|
template <class A, class B>
|
|
struct cons_type {
|
|
typedef A first_type;
|
|
typedef B second_type;
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
template <class Value> struct value_type_is : public named_template_param_base
|
|
{
|
|
typedef detail::cons_type<detail::value_type_tag, Value> type;
|
|
};
|
|
template <class Reference> struct reference_is : public named_template_param_base
|
|
{
|
|
typedef detail::cons_type<detail::reference_tag, Reference> type;
|
|
};
|
|
template <class Pointer> struct pointer_is : public named_template_param_base
|
|
{
|
|
typedef detail::cons_type<detail::pointer_tag, Pointer> type;
|
|
};
|
|
template <class Difference> struct difference_type_is
|
|
: public named_template_param_base
|
|
{
|
|
typedef detail::cons_type<detail::difference_type_tag, Difference> type;
|
|
};
|
|
template <class IteratorCategory> struct iterator_category_is
|
|
: public named_template_param_base
|
|
{
|
|
typedef detail::cons_type<detail::iterator_category_tag, IteratorCategory> type;
|
|
};
|
|
|
|
namespace detail {
|
|
|
|
struct end_of_list { };
|
|
|
|
// Given an associative list, find the value with the matching key.
|
|
// An associative list is a list of key-value pairs. The list is
|
|
// built out of cons_type's and is terminated by end_of_list.
|
|
|
|
# if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) || BOOST_WORKAROUND(__BORLANDC__, != 0)
|
|
template <class AssocList, class Key>
|
|
struct find_param;
|
|
|
|
struct find_param_continue {
|
|
template <class AssocList, class Key2> struct select {
|
|
typedef typename AssocList::first_type Head;
|
|
typedef typename Head::first_type Key1;
|
|
typedef typename Head::second_type Value;
|
|
typedef typename if_true<(is_same<Key1, Key2>::value)>::template
|
|
then<Value,
|
|
typename find_param<typename AssocList::second_type, Key2>::type
|
|
>::type type;
|
|
};
|
|
};
|
|
struct find_param_end {
|
|
template <class AssocList, class Key>
|
|
struct select { typedef detail::default_argument type; };
|
|
};
|
|
template <class AssocList> struct find_param_helper1
|
|
{ typedef find_param_continue type; };
|
|
template <> struct find_param_helper1<end_of_list>
|
|
{ typedef find_param_end type; };
|
|
|
|
template <class AssocList, class Key>
|
|
struct find_param {
|
|
typedef typename find_param_helper1<AssocList>::type select1;
|
|
typedef typename select1::template select<AssocList, Key>::type type;
|
|
};
|
|
# else
|
|
template <class AssocList, class Key> struct find_param;
|
|
|
|
template <class Key>
|
|
struct find_param<end_of_list, Key> { typedef default_argument type; };
|
|
|
|
// Found a matching Key, return the associated Value
|
|
template <class Key, class Value, class Rest>
|
|
struct find_param<detail::cons_type< detail::cons_type<Key, Value>, Rest>, Key> {
|
|
typedef Value type;
|
|
};
|
|
|
|
// Non-matching keys, continue the search
|
|
template <class Key1, class Value, class Rest, class Key2>
|
|
struct find_param<detail::cons_type< detail::cons_type<Key1, Value>, Rest>, Key2> {
|
|
typedef typename find_param<Rest, Key2>::type type;
|
|
};
|
|
# endif
|
|
|
|
struct make_named_arg {
|
|
template <class Key, class Value>
|
|
struct select { typedef typename Value::type type; };
|
|
};
|
|
struct make_key_value {
|
|
template <class Key, class Value>
|
|
struct select { typedef detail::cons_type<Key, Value> type; };
|
|
};
|
|
|
|
template <class Value>
|
|
struct is_named_parameter
|
|
{
|
|
enum { value = is_convertible< typename add_reference< Value >::type, add_reference< named_template_param_base >::type >::value };
|
|
};
|
|
|
|
# if BOOST_WORKAROUND(__MWERKS__, <= 0x2407) // workaround for broken is_convertible implementation
|
|
template <class T> struct is_named_parameter<value_type_is<T> > { enum { value = true }; };
|
|
template <class T> struct is_named_parameter<reference_is<T> > { enum { value = true }; };
|
|
template <class T> struct is_named_parameter<pointer_is<T> > { enum { value = true }; };
|
|
template <class T> struct is_named_parameter<difference_type_is<T> > { enum { value = true }; };
|
|
template <class T> struct is_named_parameter<iterator_category_is<T> > { enum { value = true }; };
|
|
# endif
|
|
|
|
template <class Key, class Value>
|
|
struct make_arg {
|
|
# if BOOST_WORKAROUND(__BORLANDC__, > 0)
|
|
// Borland C++ doesn't like the extra indirection of is_named_parameter
|
|
typedef typename
|
|
if_true<(is_convertible<Value,named_template_param_base>::value)>::
|
|
template then<make_named_arg, make_key_value>::type Make;
|
|
# else
|
|
enum { is_named = is_named_parameter<Value>::value };
|
|
typedef typename if_true<(is_named)>::template
|
|
then<make_named_arg, make_key_value>::type Make;
|
|
# endif
|
|
typedef typename Make::template select<Key, Value>::type type;
|
|
};
|
|
|
|
// Mechanism for resolving the default argument for a template parameter.
|
|
|
|
template <class T> struct is_default { typedef type_traits::no_type type; };
|
|
template <> struct is_default<default_argument>
|
|
{ typedef type_traits::yes_type type; };
|
|
|
|
struct choose_default {
|
|
template <class Arg, class DefaultGen, class Base, class Traits>
|
|
struct select {
|
|
typedef typename default_generator<DefaultGen>::type Gen;
|
|
typedef typename Gen::template select<Base,Traits>::type type;
|
|
};
|
|
};
|
|
struct choose_arg {
|
|
template <class Arg, class DefaultGen, class Base, class Traits>
|
|
struct select {
|
|
typedef Arg type;
|
|
};
|
|
};
|
|
|
|
template <class UseDefault>
|
|
struct choose_arg_or_default { typedef choose_arg type; };
|
|
template <> struct choose_arg_or_default<type_traits::yes_type> {
|
|
typedef choose_default type;
|
|
};
|
|
|
|
template <class Arg, class DefaultGen, class Base, class Traits>
|
|
class resolve_default {
|
|
typedef typename choose_arg_or_default<typename is_default<Arg>::type>::type
|
|
Selector;
|
|
public:
|
|
typedef typename Selector
|
|
::template select<Arg, DefaultGen, Base, Traits>::type type;
|
|
};
|
|
|
|
template <class Base, class Value, class Reference, class Pointer,
|
|
class Category, class Distance>
|
|
class iterator_adaptor_traits_gen
|
|
{
|
|
// Form an associative list out of the template parameters
|
|
// If the argument is a normal parameter (not named) then make_arg
|
|
// creates a key-value pair. If the argument is a named parameter,
|
|
// then make_arg extracts the key-value pair defined inside the
|
|
// named parameter.
|
|
typedef detail::cons_type< typename make_arg<value_type_tag, Value>::type,
|
|
detail::cons_type<typename make_arg<reference_tag, Reference>::type,
|
|
detail::cons_type<typename make_arg<pointer_tag, Pointer>::type,
|
|
detail::cons_type<typename make_arg<iterator_category_tag, Category>::type,
|
|
detail::cons_type<typename make_arg<difference_type_tag, Distance>::type,
|
|
end_of_list> > > > > ArgList;
|
|
|
|
// Search the list for particular parameters
|
|
typedef typename find_param<ArgList, value_type_tag>::type Val;
|
|
typedef typename find_param<ArgList, difference_type_tag>::type Diff;
|
|
typedef typename find_param<ArgList, iterator_category_tag>::type Cat;
|
|
typedef typename find_param<ArgList, pointer_tag>::type Ptr;
|
|
typedef typename find_param<ArgList, reference_tag>::type Ref;
|
|
|
|
typedef boost::iterator<Category, Value, Distance, Pointer, Reference>
|
|
Traits0;
|
|
|
|
// Compute the defaults if necessary
|
|
typedef typename resolve_default<Val, default_value_type, Base, Traits0>::type
|
|
value_type;
|
|
// if getting default value type from iterator_traits, then it won't be const
|
|
typedef typename resolve_default<Diff, default_difference_type, Base,
|
|
Traits0>::type difference_type;
|
|
typedef typename resolve_default<Cat, default_iterator_category, Base,
|
|
Traits0>::type iterator_category;
|
|
|
|
typedef boost::iterator<iterator_category, value_type, difference_type,
|
|
Pointer, Reference> Traits1;
|
|
|
|
// Compute the defaults for pointer and reference. This is done as a
|
|
// separate step because the defaults for pointer and reference depend
|
|
// on value_type.
|
|
typedef typename resolve_default<Ptr, default_pointer, Base, Traits1>::type
|
|
pointer;
|
|
typedef typename resolve_default<Ref, default_reference, Base, Traits1>::type
|
|
reference;
|
|
|
|
public:
|
|
typedef boost::iterator<iterator_category,
|
|
typename remove_const<value_type>::type,
|
|
difference_type, pointer, reference> type;
|
|
};
|
|
|
|
// This is really a partial concept check for iterators. Should it
|
|
// be moved or done differently?
|
|
template <class Category, class Value, class Difference, class Pointer, class Reference>
|
|
struct validator
|
|
{
|
|
BOOST_STATIC_CONSTANT(
|
|
bool, is_input_or_output_iter
|
|
= (boost::is_convertible<Category*,std::input_iterator_tag*>::value
|
|
| boost::is_convertible<Category*,std::output_iterator_tag*>::value));
|
|
|
|
// Iterators should satisfy one of the known categories
|
|
BOOST_STATIC_ASSERT(is_input_or_output_iter);
|
|
|
|
// Iterators >= ForwardIterator must produce real references
|
|
// as required by the C++ standard requirements in Table 74.
|
|
BOOST_STATIC_CONSTANT(
|
|
bool, forward_iter_with_real_reference
|
|
= ((!boost::is_convertible<Category*,std::forward_iterator_tag*>::value)
|
|
| boost::is_same<Reference,Value&>::value
|
|
| boost::is_same<Reference,typename add_const<Value>::type&>::value));
|
|
|
|
BOOST_STATIC_ASSERT(forward_iter_with_real_reference);
|
|
};
|
|
|
|
template <class T, class Result> struct dependent
|
|
{
|
|
typedef Result type;
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
|
|
|
|
// This macro definition is only temporary in this file
|
|
# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
|
|
# define BOOST_ARG_DEPENDENT_TYPENAME typename
|
|
# else
|
|
# define BOOST_ARG_DEPENDENT_TYPENAME
|
|
# endif
|
|
|
|
//============================================================================
|
|
//iterator_adaptor - Adapts a generic piece of data as an iterator. Adaptation
|
|
// is especially easy if the data being adapted is itself an iterator
|
|
//
|
|
// Base - the base (usually iterator) type being wrapped.
|
|
//
|
|
// Policies - a set of policies determining how the resulting iterator
|
|
// works.
|
|
//
|
|
// Value - if supplied, the value_type of the resulting iterator, unless
|
|
// const. If const, a conforming compiler strips constness for the
|
|
// value_type. If not supplied, iterator_traits<Base>::value_type is used
|
|
//
|
|
// Reference - the reference type of the resulting iterator, and in
|
|
// particular, the result type of operator*(). If not supplied but
|
|
// Value is supplied, Value& is used. Otherwise
|
|
// iterator_traits<Base>::reference is used.
|
|
//
|
|
// Pointer - the pointer type of the resulting iterator, and in
|
|
// particular, the result type of operator->(). If not
|
|
// supplied but Value is supplied, Value* is used. Otherwise
|
|
// iterator_traits<Base>::pointer is used.
|
|
//
|
|
// Category - the iterator_category of the resulting iterator. If not
|
|
// supplied, iterator_traits<Base>::iterator_category is used.
|
|
//
|
|
// Distance - the difference_type of the resulting iterator. If not
|
|
// supplied, iterator_traits<Base>::difference_type is used.
|
|
template <class Base, class Policies,
|
|
class Value = ::boost::detail::default_argument,
|
|
class Reference = ::boost::detail::default_argument,
|
|
class Pointer = ::boost::detail::default_argument,
|
|
class Category = ::boost::detail::default_argument,
|
|
class Distance = ::boost::detail::default_argument
|
|
>
|
|
struct iterator_adaptor :
|
|
#ifdef BOOST_RELOPS_AMBIGUITY_BUG
|
|
iterator_comparisons<
|
|
iterator_adaptor<Base,Policies,Value,Reference,Pointer,Category,Distance>,
|
|
typename detail::iterator_adaptor_traits_gen<Base,Value,Reference,Pointer,Category, Distance>::type
|
|
>
|
|
#else
|
|
detail::iterator_adaptor_traits_gen<Base,Value,Reference,Pointer,Category,Distance>::type
|
|
#endif
|
|
{
|
|
typedef iterator_adaptor<Base,Policies,Value,Reference,Pointer,Category,Distance> self;
|
|
public:
|
|
typedef detail::iterator_adaptor_traits_gen<Base,Value,Reference,Pointer,Category,Distance> TraitsGen;
|
|
typedef typename TraitsGen::type Traits;
|
|
|
|
typedef typename Traits::difference_type difference_type;
|
|
typedef typename Traits::value_type value_type;
|
|
typedef typename Traits::pointer pointer;
|
|
typedef typename Traits::reference reference;
|
|
typedef typename Traits::iterator_category iterator_category;
|
|
|
|
typedef Base base_type;
|
|
typedef Policies policies_type;
|
|
|
|
private:
|
|
typedef detail::validator<
|
|
iterator_category,value_type,difference_type,pointer,reference
|
|
> concept_check;
|
|
|
|
public:
|
|
iterator_adaptor()
|
|
{
|
|
}
|
|
|
|
explicit
|
|
iterator_adaptor(const Base& it, const Policies& p = Policies())
|
|
: m_iter_p(it, p) {
|
|
policies().initialize(base());
|
|
}
|
|
|
|
template <class Iter2, class Value2, class Pointer2, class Reference2>
|
|
iterator_adaptor (
|
|
const iterator_adaptor<Iter2,Policies,Value2,Reference2,Pointer2,Category,Distance>& src)
|
|
: m_iter_p(src.base(), src.policies())
|
|
{
|
|
policies().initialize(base());
|
|
}
|
|
|
|
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) || BOOST_WORKAROUND(__BORLANDC__, > 0)
|
|
// This is required to prevent a bug in how VC++ generates
|
|
// the assignment operator for compressed_pair
|
|
iterator_adaptor& operator= (const iterator_adaptor& x) {
|
|
m_iter_p = x.m_iter_p;
|
|
return *this;
|
|
}
|
|
#endif
|
|
reference operator*() const {
|
|
return policies().dereference(*this);
|
|
}
|
|
|
|
#if BOOST_WORKAROUND(BOOST_MSVC, > 0)
|
|
# pragma warning(push)
|
|
# pragma warning( disable : 4284 )
|
|
#endif
|
|
|
|
typename boost::detail::operator_arrow_result_generator<value_type,reference,pointer>::type
|
|
operator->() const
|
|
{ return detail::operator_arrow(*this, iterator_category()); }
|
|
|
|
#if BOOST_WORKAROUND(BOOST_MSVC, > 0)
|
|
# pragma warning(pop)
|
|
#endif
|
|
|
|
template <class diff_type>
|
|
typename detail::dependent<diff_type, value_type>::type operator[](diff_type n) const
|
|
{ return *(*this + n); }
|
|
|
|
self& operator++() {
|
|
#if !BOOST_WORKAROUND(__MWERKS__, < 0x2405)
|
|
policies().increment(*this);
|
|
#else
|
|
// Odd bug, MWERKS couldn't deduce the type for the member template
|
|
// Workaround by explicitly specifying the type.
|
|
policies().increment<self>(*this);
|
|
#endif
|
|
return *this;
|
|
}
|
|
|
|
self operator++(int) { self tmp(*this); ++*this; return tmp; }
|
|
|
|
self& operator--() {
|
|
#if !BOOST_WORKAROUND(__MWERKS__, < 0x2405)
|
|
policies().decrement(*this);
|
|
#else
|
|
policies().decrement<self>(*this);
|
|
#endif
|
|
return *this;
|
|
}
|
|
|
|
self operator--(int) { self tmp(*this); --*this; return tmp; }
|
|
|
|
self& operator+=(difference_type n) {
|
|
policies().advance(*this, n);
|
|
return *this;
|
|
}
|
|
|
|
self& operator-=(difference_type n) {
|
|
policies().advance(*this, -n);
|
|
return *this;
|
|
}
|
|
|
|
base_type const& base() const { return m_iter_p.first(); }
|
|
|
|
// Moved from global scope to avoid ambiguity with the operator-() which
|
|
// subtracts iterators from one another.
|
|
self operator-(difference_type x) const
|
|
{ self result(*this); return result -= x; }
|
|
private:
|
|
compressed_pair<Base,Policies> m_iter_p;
|
|
|
|
public: // implementation details (too many compilers have trouble when these are private).
|
|
base_type& base() { return m_iter_p.first(); }
|
|
Policies& policies() { return m_iter_p.second(); }
|
|
const Policies& policies() const { return m_iter_p.second(); }
|
|
};
|
|
|
|
template <class Base, class Policies, class Value, class Reference, class Pointer,
|
|
class Category, class Distance1, class Distance2>
|
|
iterator_adaptor<Base,Policies,Value,Reference,Pointer,Category,Distance1>
|
|
operator+(
|
|
iterator_adaptor<Base,Policies,Value,Reference,Pointer,Category,Distance1> p,
|
|
Distance2 x)
|
|
{
|
|
return p += x;
|
|
}
|
|
|
|
template <class Base, class Policies, class Value, class Reference, class Pointer,
|
|
class Category, class Distance1, class Distance2>
|
|
iterator_adaptor<Base,Policies,Value,Reference,Pointer,Category,Distance1>
|
|
operator+(
|
|
Distance2 x,
|
|
iterator_adaptor<Base,Policies,Value,Reference,Pointer,Category,Distance1> p)
|
|
{
|
|
return p += x;
|
|
}
|
|
|
|
template <class Iterator1, class Iterator2, class Policies, class Value1, class Value2,
|
|
class Reference1, class Reference2, class Pointer1, class Pointer2, class Category,
|
|
class Distance>
|
|
typename iterator_adaptor<Iterator1,Policies,Value1,Reference1,Pointer1,Category,Distance>::difference_type
|
|
operator-(
|
|
const iterator_adaptor<Iterator1,Policies,Value1,Reference1,Pointer1,Category,Distance>& x,
|
|
const iterator_adaptor<Iterator2,Policies,Value2,Reference2,Pointer2,Category,Distance>& y)
|
|
{
|
|
typedef typename iterator_adaptor<Iterator1,Policies,Value1,Reference1,
|
|
Pointer1,Category,Distance>::difference_type difference_type;
|
|
return x.policies().distance(y, x);
|
|
}
|
|
|
|
#ifndef BOOST_RELOPS_AMBIGUITY_BUG
|
|
template <class Iterator1, class Iterator2, class Policies, class Value1, class Value2,
|
|
class Reference1, class Reference2, class Pointer1, class Pointer2,
|
|
class Category, class Distance>
|
|
inline bool
|
|
operator==(
|
|
const iterator_adaptor<Iterator1,Policies,Value1,Reference1,Pointer1,Category,Distance>& x,
|
|
const iterator_adaptor<Iterator2,Policies,Value2,Reference2,Pointer2,Category,Distance>& y)
|
|
{
|
|
return x.policies().equal(x, y);
|
|
}
|
|
|
|
template <class Iterator1, class Iterator2, class Policies, class Value1, class Value2,
|
|
class Reference1, class Reference2, class Pointer1, class Pointer2,
|
|
class Category, class Distance>
|
|
inline bool
|
|
operator<(
|
|
const iterator_adaptor<Iterator1,Policies,Value1,Reference1,Pointer1,Category,Distance>& x,
|
|
const iterator_adaptor<Iterator2,Policies,Value2,Reference2,Pointer2,Category,Distance>& y)
|
|
{
|
|
return x.policies().distance(y, x) < 0;
|
|
}
|
|
|
|
template <class Iterator1, class Iterator2, class Policies, class Value1, class Value2,
|
|
class Reference1, class Reference2, class Pointer1, class Pointer2,
|
|
class Category, class Distance>
|
|
inline bool
|
|
operator>(
|
|
const iterator_adaptor<Iterator1,Policies,Value1,Reference1,Pointer1,Category,Distance>& x,
|
|
const iterator_adaptor<Iterator2,Policies,Value2,Reference2,Pointer2,Category,Distance>& y)
|
|
{
|
|
return x.policies().distance(y, x) > 0;
|
|
}
|
|
|
|
template <class Iterator1, class Iterator2, class Policies, class Value1, class Value2,
|
|
class Reference1, class Reference2, class Pointer1, class Pointer2,
|
|
class Category, class Distance>
|
|
inline bool
|
|
operator>=(
|
|
const iterator_adaptor<Iterator1,Policies,Value1,Reference1,Pointer1,Category,Distance>& x,
|
|
const iterator_adaptor<Iterator2,Policies,Value2,Reference2,Pointer2,Category,Distance>& y)
|
|
{
|
|
return x.policies().distance(y, x) >= 0;
|
|
}
|
|
|
|
template <class Iterator1, class Iterator2, class Policies, class Value1, class Value2,
|
|
class Reference1, class Reference2, class Pointer1, class Pointer2,
|
|
class Category, class Distance>
|
|
inline bool
|
|
operator<=(
|
|
const iterator_adaptor<Iterator1,Policies,Value1,Reference1,Pointer1,Category,Distance>& x,
|
|
const iterator_adaptor<Iterator2,Policies,Value2,Reference2,Pointer2,Category,Distance>& y)
|
|
{
|
|
return x.policies().distance(y, x) <= 0;
|
|
}
|
|
|
|
template <class Iterator1, class Iterator2, class Policies, class Value1, class Value2,
|
|
class Reference1, class Reference2, class Pointer1, class Pointer2,
|
|
class Category, class Distance>
|
|
inline bool
|
|
operator!=(
|
|
const iterator_adaptor<Iterator1,Policies,Value1,Reference1,Pointer1,Category,Distance>& x,
|
|
const iterator_adaptor<Iterator2,Policies,Value2,Reference2,Pointer2,Category,Distance>& y)
|
|
{
|
|
return !x.policies().equal(x, y);
|
|
}
|
|
#endif
|
|
|
|
//=============================================================================
|
|
// Transform Iterator Adaptor
|
|
//
|
|
// Upon deference, apply some unary function object and return the
|
|
// result by value.
|
|
|
|
template <class AdaptableUnaryFunction>
|
|
struct transform_iterator_policies : public default_iterator_policies
|
|
{
|
|
transform_iterator_policies() { }
|
|
transform_iterator_policies(const AdaptableUnaryFunction& f) : m_f(f) { }
|
|
|
|
template <class IteratorAdaptor>
|
|
typename IteratorAdaptor::reference
|
|
dereference(const IteratorAdaptor& iter) const
|
|
{ return m_f(*iter.base()); }
|
|
|
|
AdaptableUnaryFunction m_f;
|
|
};
|
|
|
|
template <class AdaptableUnaryFunction, class Iterator>
|
|
class transform_iterator_generator
|
|
{
|
|
typedef typename AdaptableUnaryFunction::result_type value_type;
|
|
public:
|
|
typedef iterator_adaptor<Iterator,
|
|
transform_iterator_policies<AdaptableUnaryFunction>,
|
|
value_type, value_type, value_type*, std::input_iterator_tag>
|
|
type;
|
|
};
|
|
|
|
template <class AdaptableUnaryFunction, class Iterator>
|
|
inline typename transform_iterator_generator<AdaptableUnaryFunction,Iterator>::type
|
|
make_transform_iterator(
|
|
Iterator base,
|
|
const AdaptableUnaryFunction& f = AdaptableUnaryFunction())
|
|
{
|
|
typedef typename transform_iterator_generator<AdaptableUnaryFunction,Iterator>::type result_t;
|
|
return result_t(base, f);
|
|
}
|
|
|
|
//=============================================================================
|
|
// Indirect Iterators Adaptor
|
|
|
|
// Given a pointer to pointers (or iterator to iterators),
|
|
// apply a double dereference inside operator*().
|
|
//
|
|
// We use the term "outer" to refer to the first level iterator type
|
|
// and "inner" to refer to the second level iterator type. For
|
|
// example, given T**, T* is the inner iterator type and T** is the
|
|
// outer iterator type. Also, const T* would be the const inner
|
|
// iterator.
|
|
|
|
// We tried to implement this with transform_iterator, but that required
|
|
// using boost::remove_ref, which is not compiler portable.
|
|
|
|
struct indirect_iterator_policies : public default_iterator_policies
|
|
{
|
|
template <class IteratorAdaptor>
|
|
typename IteratorAdaptor::reference dereference(const IteratorAdaptor& x) const
|
|
{ return **x.base(); }
|
|
};
|
|
|
|
namespace detail {
|
|
# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) // strangely instantiated even when unused! Maybe try a recursive template someday ;-)
|
|
template <class T>
|
|
struct traits_of_value_type {
|
|
typedef typename boost::detail::iterator_traits<T>::value_type outer_value;
|
|
typedef typename boost::detail::iterator_traits<outer_value>::value_type value_type;
|
|
typedef typename boost::detail::iterator_traits<outer_value>::reference reference;
|
|
typedef typename boost::detail::iterator_traits<outer_value>::pointer pointer;
|
|
};
|
|
# endif
|
|
}
|
|
|
|
template <class OuterIterator, // Mutable or Immutable, does not matter
|
|
class Value
|
|
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
|
|
= BOOST_ARG_DEPENDENT_TYPENAME detail::traits_of_value_type<
|
|
OuterIterator>::value_type
|
|
#endif
|
|
, class Reference
|
|
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
|
|
= BOOST_ARG_DEPENDENT_TYPENAME detail::traits_of_value_type<
|
|
OuterIterator>::reference
|
|
#else
|
|
= Value &
|
|
#endif
|
|
, class Category = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_traits<
|
|
OuterIterator>::iterator_category
|
|
, class Pointer
|
|
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
|
|
= BOOST_ARG_DEPENDENT_TYPENAME detail::traits_of_value_type<
|
|
OuterIterator>::pointer
|
|
#else
|
|
= Value*
|
|
#endif
|
|
>
|
|
struct indirect_iterator_generator
|
|
{
|
|
typedef iterator_adaptor<OuterIterator,
|
|
indirect_iterator_policies,Value,Reference,Pointer,Category> type;
|
|
};
|
|
|
|
template <class OuterIterator, // Mutable or Immutable, does not matter
|
|
class Value
|
|
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
|
|
= BOOST_ARG_DEPENDENT_TYPENAME detail::traits_of_value_type<
|
|
OuterIterator>::value_type
|
|
#endif
|
|
, class Reference
|
|
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
|
|
= BOOST_ARG_DEPENDENT_TYPENAME detail::traits_of_value_type<
|
|
OuterIterator>::reference
|
|
#else
|
|
= Value &
|
|
#endif
|
|
, class ConstReference = Value const&
|
|
, class Category = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_traits<
|
|
OuterIterator>::iterator_category
|
|
, class Pointer
|
|
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
|
|
= BOOST_ARG_DEPENDENT_TYPENAME detail::traits_of_value_type<
|
|
OuterIterator>::pointer
|
|
#else
|
|
= Value*
|
|
#endif
|
|
, class ConstPointer = Value const*
|
|
>
|
|
struct indirect_iterator_pair_generator
|
|
{
|
|
typedef typename indirect_iterator_generator<OuterIterator,
|
|
Value, Reference,Category,Pointer>::type iterator;
|
|
typedef typename indirect_iterator_generator<OuterIterator,
|
|
Value, ConstReference,Category,ConstPointer>::type const_iterator;
|
|
};
|
|
|
|
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
|
|
template <class OuterIterator>
|
|
inline typename indirect_iterator_generator<OuterIterator>::type
|
|
make_indirect_iterator(OuterIterator base)
|
|
{
|
|
typedef typename indirect_iterator_generator
|
|
<OuterIterator>::type result_t;
|
|
return result_t(base);
|
|
}
|
|
#endif
|
|
|
|
//=============================================================================
|
|
// Reverse Iterators Adaptor
|
|
|
|
struct reverse_iterator_policies : public default_iterator_policies
|
|
{
|
|
template <class IteratorAdaptor>
|
|
typename IteratorAdaptor::reference dereference(const IteratorAdaptor& x) const
|
|
{ return *boost::prior(x.base()); }
|
|
|
|
template <class BidirectionalIterator>
|
|
void increment(BidirectionalIterator& x) const
|
|
{ --x.base(); }
|
|
|
|
template <class BidirectionalIterator>
|
|
void decrement(BidirectionalIterator& x) const
|
|
{ ++x.base(); }
|
|
|
|
template <class BidirectionalIterator, class DifferenceType>
|
|
void advance(BidirectionalIterator& x, DifferenceType n) const
|
|
{ x.base() -= n; }
|
|
|
|
template <class Iterator1, class Iterator2>
|
|
typename Iterator1::difference_type distance(
|
|
const Iterator1& x, const Iterator2& y) const
|
|
{ return x.base() - y.base(); }
|
|
|
|
template <class Iterator1, class Iterator2>
|
|
bool equal(const Iterator1& x, const Iterator2& y) const
|
|
{ return x.base() == y.base(); }
|
|
};
|
|
|
|
template <class BidirectionalIterator,
|
|
class Value = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_traits<BidirectionalIterator>::value_type,
|
|
class Reference = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_defaults<BidirectionalIterator,Value>::reference,
|
|
class Pointer = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_defaults<BidirectionalIterator,Value>::pointer,
|
|
class Category = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_traits<BidirectionalIterator>::iterator_category,
|
|
class Distance = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_traits<BidirectionalIterator>::difference_type
|
|
>
|
|
struct reverse_iterator_generator
|
|
{
|
|
typedef iterator_adaptor<BidirectionalIterator,reverse_iterator_policies,
|
|
Value,Reference,Pointer,Category,Distance> type;
|
|
};
|
|
|
|
template <class BidirectionalIterator>
|
|
inline typename reverse_iterator_generator<BidirectionalIterator>::type
|
|
make_reverse_iterator(BidirectionalIterator base)
|
|
{
|
|
typedef typename reverse_iterator_generator<BidirectionalIterator>::type result_t;
|
|
return result_t(base);
|
|
}
|
|
|
|
//=============================================================================
|
|
// Projection Iterators Adaptor
|
|
|
|
template <class AdaptableUnaryFunction>
|
|
struct projection_iterator_policies : public default_iterator_policies
|
|
{
|
|
projection_iterator_policies() { }
|
|
projection_iterator_policies(const AdaptableUnaryFunction& f) : m_f(f) { }
|
|
|
|
template <class IteratorAdaptor>
|
|
typename IteratorAdaptor::reference dereference(IteratorAdaptor const& iter) const {
|
|
return m_f(*iter.base());
|
|
}
|
|
|
|
AdaptableUnaryFunction m_f;
|
|
};
|
|
|
|
template <class AdaptableUnaryFunction, class Iterator>
|
|
class projection_iterator_generator {
|
|
typedef typename AdaptableUnaryFunction::result_type value_type;
|
|
typedef projection_iterator_policies<AdaptableUnaryFunction> policies;
|
|
public:
|
|
typedef iterator_adaptor<Iterator,policies,value_type,value_type&,value_type*> type;
|
|
};
|
|
|
|
template <class AdaptableUnaryFunction, class Iterator>
|
|
class const_projection_iterator_generator {
|
|
typedef typename AdaptableUnaryFunction::result_type value_type;
|
|
typedef projection_iterator_policies<AdaptableUnaryFunction> policies;
|
|
public:
|
|
typedef iterator_adaptor<Iterator,policies,value_type,const value_type&,const value_type*> type;
|
|
};
|
|
|
|
template <class AdaptableUnaryFunction, class Iterator, class ConstIterator>
|
|
struct projection_iterator_pair_generator {
|
|
typedef typename projection_iterator_generator<AdaptableUnaryFunction, Iterator>::type iterator;
|
|
typedef typename const_projection_iterator_generator<AdaptableUnaryFunction, ConstIterator>::type const_iterator;
|
|
};
|
|
|
|
|
|
template <class AdaptableUnaryFunction, class Iterator>
|
|
inline typename projection_iterator_generator<AdaptableUnaryFunction, Iterator>::type
|
|
make_projection_iterator(
|
|
Iterator iter,
|
|
const AdaptableUnaryFunction& f = AdaptableUnaryFunction())
|
|
{
|
|
typedef typename projection_iterator_generator<AdaptableUnaryFunction, Iterator>::type result_t;
|
|
return result_t(iter, f);
|
|
}
|
|
|
|
template <class AdaptableUnaryFunction, class Iterator>
|
|
inline typename const_projection_iterator_generator<AdaptableUnaryFunction, Iterator>::type
|
|
make_const_projection_iterator(
|
|
Iterator iter,
|
|
const AdaptableUnaryFunction& f = AdaptableUnaryFunction())
|
|
{
|
|
typedef typename const_projection_iterator_generator<AdaptableUnaryFunction, Iterator>::type result_t;
|
|
return result_t(iter, f);
|
|
}
|
|
|
|
//=============================================================================
|
|
// Filter Iterator Adaptor
|
|
|
|
template <class Predicate, class Iterator>
|
|
class filter_iterator_policies
|
|
{
|
|
public:
|
|
filter_iterator_policies() { }
|
|
|
|
filter_iterator_policies(const Predicate& p, const Iterator& end)
|
|
: m_predicate(p), m_end(end) { }
|
|
|
|
void initialize(Iterator& x) {
|
|
satisfy_predicate(x);
|
|
}
|
|
|
|
// The Iter template argument is neccessary for compatibility with a MWCW
|
|
// bug workaround
|
|
template <class IteratorAdaptor>
|
|
void increment(IteratorAdaptor& x) {
|
|
++x.base();
|
|
satisfy_predicate(x.base());
|
|
}
|
|
|
|
template <class IteratorAdaptor>
|
|
typename IteratorAdaptor::reference dereference(const IteratorAdaptor& x) const
|
|
{ return *x.base(); }
|
|
|
|
template <class IteratorAdaptor1, class IteratorAdaptor2>
|
|
bool equal(const IteratorAdaptor1& x, const IteratorAdaptor2& y) const
|
|
{ return x.base() == y.base(); }
|
|
|
|
private:
|
|
void satisfy_predicate(Iterator& iter);
|
|
Predicate m_predicate;
|
|
Iterator m_end;
|
|
};
|
|
|
|
template <class Predicate, class Iterator>
|
|
void filter_iterator_policies<Predicate,Iterator>::satisfy_predicate(
|
|
Iterator& iter)
|
|
{
|
|
while (m_end != iter && !m_predicate(*iter))
|
|
++iter;
|
|
}
|
|
|
|
|
|
|
|
namespace detail {
|
|
// A type generator returning Base if T is derived from Base, and T otherwise.
|
|
template <class Base, class T>
|
|
struct reduce_to_base_class
|
|
{
|
|
typedef typename if_true<(
|
|
::boost::is_convertible<T*,Base*>::value
|
|
)>::template then<Base,T>::type type;
|
|
};
|
|
|
|
// "Steps down" the category of iterators below bidirectional so the category
|
|
// can be used with filter iterators.
|
|
template <class Iterator>
|
|
struct non_bidirectional_category
|
|
{
|
|
# if !BOOST_WORKAROUND(__MWERKS__, <= 0x2407)
|
|
typedef typename reduce_to_base_class<
|
|
std::forward_iterator_tag,
|
|
typename iterator_traits<Iterator>::iterator_category
|
|
>::type type;
|
|
private:
|
|
// For some reason, putting this assertion in filter_iterator_generator fails inexplicably under MSVC
|
|
BOOST_STATIC_CONSTANT(
|
|
bool, is_bidirectional
|
|
= (!boost::is_convertible<type*, std::bidirectional_iterator_tag*>::value));
|
|
BOOST_STATIC_ASSERT(is_bidirectional);
|
|
# else
|
|
// is_convertible doesn't work with MWERKS
|
|
typedef typename iterator_traits<Iterator>::iterator_category input_category;
|
|
public:
|
|
typedef typename if_true<(
|
|
boost::is_same<input_category,std::random_access_iterator_tag>::value
|
|
|| boost::is_same<input_category,std::bidirectional_iterator_tag>::value
|
|
)>::template then<
|
|
std::forward_iterator_tag,
|
|
input_category
|
|
>::type type;
|
|
# endif
|
|
};
|
|
}
|
|
|
|
template <class Predicate, class Iterator,
|
|
class Value = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_traits<Iterator>::value_type,
|
|
class Reference = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_defaults<Iterator,Value>::reference,
|
|
class Pointer = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_defaults<Iterator,Value>::pointer,
|
|
class Category = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::non_bidirectional_category<Iterator>::type,
|
|
class Distance = BOOST_ARG_DEPENDENT_TYPENAME boost::detail::iterator_traits<Iterator>::difference_type
|
|
>
|
|
class filter_iterator_generator {
|
|
BOOST_STATIC_CONSTANT(bool, is_bidirectional
|
|
= (boost::is_convertible<Category*, std::bidirectional_iterator_tag*>::value));
|
|
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) // I don't have any idea why this occurs, but it doesn't seem to hurt too badly.
|
|
BOOST_STATIC_ASSERT(!is_bidirectional);
|
|
#endif
|
|
typedef filter_iterator_policies<Predicate,Iterator> policies_type;
|
|
public:
|
|
typedef iterator_adaptor<Iterator,policies_type,
|
|
Value,Reference,Pointer,Category,Distance> type;
|
|
};
|
|
|
|
// This keeps MSVC happy; it doesn't like to deduce default template arguments
|
|
// for template function return types
|
|
namespace detail {
|
|
template <class Predicate, class Iterator>
|
|
struct filter_generator {
|
|
typedef typename boost::filter_iterator_generator<Predicate,Iterator>::type type;
|
|
};
|
|
}
|
|
|
|
template <class Predicate, class Iterator>
|
|
inline typename detail::filter_generator<Predicate, Iterator>::type
|
|
make_filter_iterator(Iterator first, Iterator last, const Predicate& p = Predicate())
|
|
{
|
|
typedef filter_iterator_generator<Predicate, Iterator> Gen;
|
|
typedef filter_iterator_policies<Predicate,Iterator> policies_t;
|
|
typedef typename Gen::type result_t;
|
|
return result_t(first, policies_t(p, last));
|
|
}
|
|
|
|
} // namespace boost
|
|
# undef BOOST_ARG_DEPENDENT_TYPENAME
|
|
|
|
|
|
#endif
|
|
|
|
|
|
|