Swiftdiff options
Diffstat (limited to '3rdParty/Boost/src/boost/move/utility.hpp')
| -rw-r--r-- | 3rdParty/Boost/src/boost/move/utility.hpp | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/move/utility.hpp b/3rdParty/Boost/src/boost/move/utility.hpp new file mode 100644 index 0000000..964500e --- /dev/null +++ b/3rdParty/Boost/src/boost/move/utility.hpp @@ -0,0 +1,194 @@ +////////////////////////////////////////////////////////////////////////////// +// +// (C) Copyright Ion Gaztanaga 2012-2012. +// 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) +// +// See http://www.boost.org/libs/move for documentation. +// +////////////////////////////////////////////////////////////////////////////// + +//! \file + +#ifndef BOOST_MOVE_MOVE_UTILITY_HPP +#define BOOST_MOVE_MOVE_UTILITY_HPP + +#include <boost/move/detail/config_begin.hpp> +#include <boost/move/core.hpp> +#include <boost/move/detail/meta_utils.hpp> + +#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_MOVE_DOXYGEN_INVOKED) + + namespace boost { + + template<class T> + struct enable_move_utility_emulation + { + static const bool value = true; + }; + + ////////////////////////////////////////////////////////////////////////////// + // + // move() + // + ////////////////////////////////////////////////////////////////////////////// + + template <class T> + inline typename ::boost::move_detail::enable_if_c + < enable_move_utility_emulation<T>::value && !has_move_emulation_enabled<T>::value, T&>::type + move(T& x) BOOST_NOEXCEPT + { + return x; + } + + template <class T> + inline typename ::boost::move_detail::enable_if_c + < enable_move_utility_emulation<T>::value && has_move_emulation_enabled<T>::value, rv<T>&>::type + move(T& x) BOOST_NOEXCEPT + { + return *static_cast<rv<T>* >(::boost::move_detail::addressof(x)); + } + + template <class T> + inline typename ::boost::move_detail::enable_if_c + < enable_move_utility_emulation<T>::value && has_move_emulation_enabled<T>::value, rv<T>&>::type + move(rv<T>& x) BOOST_NOEXCEPT + { + return x; + } + + ////////////////////////////////////////////////////////////////////////////// + // + // forward() + // + ////////////////////////////////////////////////////////////////////////////// + + template <class T> + inline typename ::boost::move_detail::enable_if_c + < enable_move_utility_emulation<T>::value && ::boost::move_detail::is_rv<T>::value, T &>::type + forward(const typename ::boost::move_detail::identity<T>::type &x) BOOST_NOEXCEPT + { + return const_cast<T&>(x); + } + + template <class T> + inline typename ::boost::move_detail::enable_if_c + < enable_move_utility_emulation<T>::value && !::boost::move_detail::is_rv<T>::value, const T &>::type + forward(const typename ::boost::move_detail::identity<T>::type &x) BOOST_NOEXCEPT + { + return x; + } + + } //namespace boost + +#else //#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_MOVE_DOXYGEN_INVOKED) + + #if defined(BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE) + #include <utility> + + namespace boost{ + + using ::std::move; + using ::std::forward; + + } //namespace boost + + #else //!BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE + + #include <boost/type_traits/remove_reference.hpp> + + namespace boost { + + //! This trait's internal boolean `value` is false in compilers with rvalue references + //! and true in compilers without rvalue references. + //! + //! A user can specialize this trait for a type T to false to SFINAE out `move` and `forward` + //! so that the user can define a different move emulation for that type in namespace boost + //! (e.g. another Boost library for its types) and avoid any overload ambiguity. + template<class T> + struct enable_move_utility_emulation + { + static const bool value = false; + }; + + ////////////////////////////////////////////////////////////////////////////// + // + // move + // + ////////////////////////////////////////////////////////////////////////////// + + #if defined(BOOST_MOVE_DOXYGEN_INVOKED) + //! This function provides a way to convert a reference into a rvalue reference + //! in compilers with rvalue references. For other compilers converts T & into + //! <i>::boost::rv<T> &</i> so that move emulation is activated. + template <class T> + rvalue_reference move(input_reference) noexcept; + + #elif defined(BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES) + + //Old move approach, lvalues could bind to rvalue references + template <class T> + inline typename remove_reference<T>::type && move(T&& t) BOOST_NOEXCEPT + { return t; } + + #else //BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES + + template <class T> + inline typename remove_reference<T>::type && move(T&& t) BOOST_NOEXCEPT + { return static_cast<typename remove_reference<T>::type &&>(t); } + + #endif //BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES + + ////////////////////////////////////////////////////////////////////////////// + // + // forward + // + ////////////////////////////////////////////////////////////////////////////// + + + #if defined(BOOST_MOVE_DOXYGEN_INVOKED) + //! This function provides limited form of forwarding that is usually enough for + //! in-place construction and avoids the exponential overloading for + //! achieve the limited forwarding in C++03. + //! + //! For compilers with rvalue references this function provides perfect forwarding. + //! + //! Otherwise: + //! * If input_reference binds to const ::boost::rv<T> & then it output_reference is + //! ::boost::rv<T> & + //! + //! * Else, output_reference is equal to input_reference. + template <class T> output_reference forward(input_reference) noexcept; + #elif defined(BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES) + + //Old move approach, lvalues could bind to rvalue references + + template <class T> + inline T&& forward(typename ::boost::move_detail::identity<T>::type&& t) BOOST_NOEXCEPT + { return t; } + + #else //Old move + + //Implementation #5 from N2951, thanks to Howard Hinnant + + template <class T, class U> + inline T&& forward(U&& t + , typename ::boost::move_detail::enable_if_c< + move_detail::is_lvalue_reference<T>::value ? move_detail::is_lvalue_reference<U>::value : true>::type * = 0/* + , typename ::boost::move_detail::enable_if_c< + move_detail::is_convertible + <typename remove_reference<U>::type*, typename remove_reference<T>::type*>::value>::type * = 0*/) BOOST_NOEXCEPT + { return static_cast<T&&>(t); } + + #endif //BOOST_MOVE_DOXYGEN_INVOKED + + } //namespace boost { + + #endif //#if defined(BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE) + +#endif //BOOST_NO_CXX11_RVALUE_REFERENCES + +#include <boost/move/detail/config_end.hpp> + +#endif //#ifndef BOOST_MOVE_MOVE_UTILITY_HPP |