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e1644a68eb
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@6319 a592a061-630c-0410-9148-cb99ea01b6c8
164 lines
3.2 KiB
C++
164 lines
3.2 KiB
C++
#ifndef BOOST_REF_HPP_INCLUDED
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# define BOOST_REF_HPP_INCLUDED
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# if _MSC_VER+0 >= 1020
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# pragma once
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# endif
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# include <boost/config.hpp>
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# include <boost/utility/addressof.hpp>
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# include <boost/mpl/bool.hpp>
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//
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// ref.hpp - ref/cref, useful helper functions
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//
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// Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)
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// Copyright (C) 2001, 2002 Peter Dimov
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// Copyright (C) 2002 David Abrahams
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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// See http://www.boost.org/libs/bind/ref.html for documentation.
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//
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namespace boost
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{
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template<class T> class reference_wrapper
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{
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public:
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typedef T type;
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#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
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explicit reference_wrapper(T& t): t_(&t) {}
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#else
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explicit reference_wrapper(T& t): t_(addressof(t)) {}
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#endif
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operator T& () const { return *t_; }
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T& get() const { return *t_; }
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T* get_pointer() const { return t_; }
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private:
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T* t_;
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};
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# if defined(__BORLANDC__) && (__BORLANDC__ <= 0x570)
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# define BOOST_REF_CONST
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# else
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# define BOOST_REF_CONST const
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# endif
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template<class T> inline reference_wrapper<T> BOOST_REF_CONST ref(T & t)
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{
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return reference_wrapper<T>(t);
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}
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template<class T> inline reference_wrapper<T const> BOOST_REF_CONST cref(T const & t)
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{
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return reference_wrapper<T const>(t);
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}
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# undef BOOST_REF_CONST
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# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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template<typename T>
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class is_reference_wrapper
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: public mpl::false_
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{
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};
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template<typename T>
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class is_reference_wrapper<reference_wrapper<T> >
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: public mpl::true_
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{
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};
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template<typename T>
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class unwrap_reference
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{
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public:
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typedef T type;
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};
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template<typename T>
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class unwrap_reference<reference_wrapper<T> >
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{
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public:
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typedef T type;
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};
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# else // no partial specialization
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} // namespace boost
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#include <boost/type.hpp>
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namespace boost
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{
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namespace detail
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{
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typedef char (&yes_reference_wrapper_t)[1];
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typedef char (&no_reference_wrapper_t)[2];
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no_reference_wrapper_t is_reference_wrapper_test(...);
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template<typename T>
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yes_reference_wrapper_t is_reference_wrapper_test(type< reference_wrapper<T> >);
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template<bool wrapped>
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struct reference_unwrapper
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{
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template <class T>
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struct apply
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{
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typedef T type;
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};
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};
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template<>
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struct reference_unwrapper<true>
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{
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template <class T>
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struct apply
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{
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typedef typename T::type type;
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};
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};
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}
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template<typename T>
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class is_reference_wrapper
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{
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public:
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BOOST_STATIC_CONSTANT(
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bool, value = (
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sizeof(detail::is_reference_wrapper_test(type<T>()))
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== sizeof(detail::yes_reference_wrapper_t)));
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typedef ::boost::mpl::bool_<value> type;
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};
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template <typename T>
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class unwrap_reference
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: public detail::reference_unwrapper<
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is_reference_wrapper<T>::value
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>::template apply<T>
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{};
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# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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} // namespace boost
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#endif // #ifndef BOOST_REF_HPP_INCLUDED
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