mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-12-19 04:20:09 +00:00
326 lines
8.7 KiB
C++
326 lines
8.7 KiB
C++
// See http://www.boost.org/libs/any for Documentation.
|
|
|
|
#ifndef BOOST_ANY_INCLUDED
|
|
#define BOOST_ANY_INCLUDED
|
|
|
|
#if defined(_MSC_VER)
|
|
# pragma once
|
|
#endif
|
|
|
|
// what: variant type boost::any
|
|
// who: contributed by Kevlin Henney,
|
|
// with features contributed and bugs found by
|
|
// Antony Polukhin, Ed Brey, Mark Rodgers,
|
|
// Peter Dimov, and James Curran
|
|
// when: July 2001, April 2013 - May 2013
|
|
|
|
#include <algorithm>
|
|
|
|
#include "boost/config.hpp"
|
|
#include <boost/type_index.hpp>
|
|
#include <boost/type_traits/remove_reference.hpp>
|
|
#include <boost/type_traits/decay.hpp>
|
|
#include <boost/type_traits/remove_cv.hpp>
|
|
#include <boost/type_traits/add_reference.hpp>
|
|
#include <boost/type_traits/is_reference.hpp>
|
|
#include <boost/type_traits/is_const.hpp>
|
|
#include <boost/throw_exception.hpp>
|
|
#include <boost/static_assert.hpp>
|
|
#include <boost/utility/enable_if.hpp>
|
|
#include <boost/type_traits/is_same.hpp>
|
|
#include <boost/type_traits/is_const.hpp>
|
|
#include <boost/mpl/if.hpp>
|
|
|
|
namespace boost
|
|
{
|
|
class any
|
|
{
|
|
public: // structors
|
|
|
|
any() BOOST_NOEXCEPT
|
|
: content(0)
|
|
{
|
|
}
|
|
|
|
template<typename ValueType>
|
|
any(const ValueType & value)
|
|
: content(new holder<
|
|
BOOST_DEDUCED_TYPENAME remove_cv<BOOST_DEDUCED_TYPENAME decay<const ValueType>::type>::type
|
|
>(value))
|
|
{
|
|
}
|
|
|
|
any(const any & other)
|
|
: content(other.content ? other.content->clone() : 0)
|
|
{
|
|
}
|
|
|
|
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
|
|
// Move constructor
|
|
any(any&& other) BOOST_NOEXCEPT
|
|
: content(other.content)
|
|
{
|
|
other.content = 0;
|
|
}
|
|
|
|
// Perfect forwarding of ValueType
|
|
template<typename ValueType>
|
|
any(ValueType&& value
|
|
, typename boost::disable_if<boost::is_same<any&, ValueType> >::type* = 0 // disable if value has type `any&`
|
|
, typename boost::disable_if<boost::is_const<ValueType> >::type* = 0) // disable if value has type `const ValueType&&`
|
|
: content(new holder< typename decay<ValueType>::type >(static_cast<ValueType&&>(value)))
|
|
{
|
|
}
|
|
#endif
|
|
|
|
~any() BOOST_NOEXCEPT
|
|
{
|
|
delete content;
|
|
}
|
|
|
|
public: // modifiers
|
|
|
|
any & swap(any & rhs) BOOST_NOEXCEPT
|
|
{
|
|
std::swap(content, rhs.content);
|
|
return *this;
|
|
}
|
|
|
|
|
|
#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
|
|
template<typename ValueType>
|
|
any & operator=(const ValueType & rhs)
|
|
{
|
|
any(rhs).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
any & operator=(any rhs)
|
|
{
|
|
any(rhs).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
#else
|
|
any & operator=(const any& rhs)
|
|
{
|
|
any(rhs).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
// move assignement
|
|
any & operator=(any&& rhs) BOOST_NOEXCEPT
|
|
{
|
|
rhs.swap(*this);
|
|
any().swap(rhs);
|
|
return *this;
|
|
}
|
|
|
|
// Perfect forwarding of ValueType
|
|
template <class ValueType>
|
|
any & operator=(ValueType&& rhs)
|
|
{
|
|
any(static_cast<ValueType&&>(rhs)).swap(*this);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
public: // queries
|
|
|
|
bool empty() const BOOST_NOEXCEPT
|
|
{
|
|
return !content;
|
|
}
|
|
|
|
void clear() BOOST_NOEXCEPT
|
|
{
|
|
any().swap(*this);
|
|
}
|
|
|
|
const boost::typeindex::type_info& type() const BOOST_NOEXCEPT
|
|
{
|
|
return content ? content->type() : boost::typeindex::type_id<void>().type_info();
|
|
}
|
|
|
|
#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
|
|
private: // types
|
|
#else
|
|
public: // types (public so any_cast can be non-friend)
|
|
#endif
|
|
|
|
class placeholder
|
|
{
|
|
public: // structors
|
|
|
|
virtual ~placeholder()
|
|
{
|
|
}
|
|
|
|
public: // queries
|
|
|
|
virtual const boost::typeindex::type_info& type() const BOOST_NOEXCEPT = 0;
|
|
|
|
virtual placeholder * clone() const = 0;
|
|
|
|
};
|
|
|
|
template<typename ValueType>
|
|
class holder : public placeholder
|
|
{
|
|
public: // structors
|
|
|
|
holder(const ValueType & value)
|
|
: held(value)
|
|
{
|
|
}
|
|
|
|
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
|
|
holder(ValueType&& value)
|
|
: held(static_cast< ValueType&& >(value))
|
|
{
|
|
}
|
|
#endif
|
|
public: // queries
|
|
|
|
virtual const boost::typeindex::type_info& type() const BOOST_NOEXCEPT
|
|
{
|
|
return boost::typeindex::type_id<ValueType>().type_info();
|
|
}
|
|
|
|
virtual placeholder * clone() const
|
|
{
|
|
return new holder(held);
|
|
}
|
|
|
|
public: // representation
|
|
|
|
ValueType held;
|
|
|
|
private: // intentionally left unimplemented
|
|
holder & operator=(const holder &);
|
|
};
|
|
|
|
#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
|
|
|
|
private: // representation
|
|
|
|
template<typename ValueType>
|
|
friend ValueType * any_cast(any *) BOOST_NOEXCEPT;
|
|
|
|
template<typename ValueType>
|
|
friend ValueType * unsafe_any_cast(any *) BOOST_NOEXCEPT;
|
|
|
|
#else
|
|
|
|
public: // representation (public so any_cast can be non-friend)
|
|
|
|
#endif
|
|
|
|
placeholder * content;
|
|
|
|
};
|
|
|
|
inline void swap(any & lhs, any & rhs) BOOST_NOEXCEPT
|
|
{
|
|
lhs.swap(rhs);
|
|
}
|
|
|
|
class BOOST_SYMBOL_VISIBLE bad_any_cast :
|
|
#ifndef BOOST_NO_RTTI
|
|
public std::bad_cast
|
|
#else
|
|
public std::exception
|
|
#endif
|
|
{
|
|
public:
|
|
virtual const char * what() const BOOST_NOEXCEPT_OR_NOTHROW
|
|
{
|
|
return "boost::bad_any_cast: "
|
|
"failed conversion using boost::any_cast";
|
|
}
|
|
};
|
|
|
|
template<typename ValueType>
|
|
ValueType * any_cast(any * operand) BOOST_NOEXCEPT
|
|
{
|
|
return operand && operand->type() == boost::typeindex::type_id<ValueType>()
|
|
? &static_cast<any::holder<BOOST_DEDUCED_TYPENAME remove_cv<ValueType>::type> *>(operand->content)->held
|
|
: 0;
|
|
}
|
|
|
|
template<typename ValueType>
|
|
inline const ValueType * any_cast(const any * operand) BOOST_NOEXCEPT
|
|
{
|
|
return any_cast<ValueType>(const_cast<any *>(operand));
|
|
}
|
|
|
|
template<typename ValueType>
|
|
ValueType any_cast(any & operand)
|
|
{
|
|
typedef BOOST_DEDUCED_TYPENAME remove_reference<ValueType>::type nonref;
|
|
|
|
|
|
nonref * result = any_cast<nonref>(&operand);
|
|
if(!result)
|
|
boost::throw_exception(bad_any_cast());
|
|
|
|
// Attempt to avoid construction of a temporary object in cases when
|
|
// `ValueType` is not a reference. Example:
|
|
// `static_cast<std::string>(*result);`
|
|
// which is equal to `std::string(*result);`
|
|
typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
|
|
boost::is_reference<ValueType>,
|
|
ValueType,
|
|
BOOST_DEDUCED_TYPENAME boost::add_reference<ValueType>::type
|
|
>::type ref_type;
|
|
|
|
return static_cast<ref_type>(*result);
|
|
}
|
|
|
|
template<typename ValueType>
|
|
inline ValueType any_cast(const any & operand)
|
|
{
|
|
typedef BOOST_DEDUCED_TYPENAME remove_reference<ValueType>::type nonref;
|
|
return any_cast<const nonref &>(const_cast<any &>(operand));
|
|
}
|
|
|
|
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
|
|
template<typename ValueType>
|
|
inline ValueType any_cast(any&& operand)
|
|
{
|
|
BOOST_STATIC_ASSERT_MSG(
|
|
boost::is_rvalue_reference<ValueType&&>::value /*true if ValueType is rvalue or just a value*/
|
|
|| boost::is_const< typename boost::remove_reference<ValueType>::type >::value,
|
|
"boost::any_cast shall not be used for getting nonconst references to temporary objects"
|
|
);
|
|
return any_cast<ValueType>(operand);
|
|
}
|
|
#endif
|
|
|
|
|
|
// Note: The "unsafe" versions of any_cast are not part of the
|
|
// public interface and may be removed at any time. They are
|
|
// required where we know what type is stored in the any and can't
|
|
// use typeid() comparison, e.g., when our types may travel across
|
|
// different shared libraries.
|
|
template<typename ValueType>
|
|
inline ValueType * unsafe_any_cast(any * operand) BOOST_NOEXCEPT
|
|
{
|
|
return &static_cast<any::holder<ValueType> *>(operand->content)->held;
|
|
}
|
|
|
|
template<typename ValueType>
|
|
inline const ValueType * unsafe_any_cast(const any * operand) BOOST_NOEXCEPT
|
|
{
|
|
return unsafe_any_cast<ValueType>(const_cast<any *>(operand));
|
|
}
|
|
}
|
|
|
|
// Copyright Kevlin Henney, 2000, 2001, 2002. All rights reserved.
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See
|
|
// accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#endif
|