| author | sl |
| Tue, 10 Jun 2014 14:32:02 +0200 | |
| changeset 1 | 260cb5ec6c19 |
| permissions | -rw-r--r-- |
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#ifndef BOOST_REF_HPP_INCLUDED |
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#define BOOST_REF_HPP_INCLUDED |
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|
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// MS compatible compilers support #pragma once |
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|
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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|
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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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#include <boost/detail/workaround.hpp> |
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|
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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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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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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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|
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namespace boost |
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{
|
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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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|
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#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, < 1300 ) |
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|
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explicit reference_wrapper(T& t): t_(&t) {}
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|
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#else |
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|
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explicit reference_wrapper(T& t): t_(boost::addressof(t)) {}
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|
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#endif |
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|
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operator T& () const { return *t_; }
|
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|
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T& get() const { return *t_; }
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|
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T* get_pointer() const { return t_; }
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|
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private: |
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|
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T* t_; |
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}; |
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|
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# if defined( __BORLANDC__ ) && BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x581) ) |
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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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|
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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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|
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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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|
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# undef BOOST_REF_CONST |
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|
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# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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|
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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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|
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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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|
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# define AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(X) \ |
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template<typename T> \ |
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class is_reference_wrapper< X > \ |
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: public mpl::true_ \ |
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{ \
|
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}; \ |
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\ |
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template<typename T> \ |
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class unwrap_reference< X > \ |
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{ \
|
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public: \ |
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typedef T type; \ |
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}; \ |
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/**/ |
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|
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AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(reference_wrapper<T>) |
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#if !defined(BOOST_NO_CV_SPECIALIZATIONS) |
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AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(reference_wrapper<T> const) |
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AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(reference_wrapper<T> volatile) |
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AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF(reference_wrapper<T> const volatile) |
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#endif |
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|
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# undef AUX_REFERENCE_WRAPPER_METAFUNCTIONS_DEF |
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|
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# else // no partial specialization |
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|
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} // namespace boost |
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|
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#include <boost/type.hpp> |
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|
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namespace boost |
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{
|
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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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|
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no_reference_wrapper_t is_reference_wrapper_test(...); |
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|
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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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|
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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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|
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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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|
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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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|
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typedef ::boost::mpl::bool_<value> type; |
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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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: 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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|
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# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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|
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} // namespace boost |
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|
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#endif // #ifndef BOOST_REF_HPP_INCLUDED |