Chris@102: // Copyright (C) 2007, 2008 Steven Watanabe, Joseph Gauterin, Niels Dekker
Chris@102: //
Chris@102: // Distributed under the Boost Software License, Version 1.0. (See
Chris@102: // accompanying file LICENSE_1_0.txt or copy at
Chris@102: // http://www.boost.org/LICENSE_1_0.txt)
Chris@102: // For more information, see http://www.boost.org
Chris@102: 
Chris@102: 
Chris@102: #ifndef BOOST_CORE_SWAP_HPP
Chris@102: #define BOOST_CORE_SWAP_HPP
Chris@102: 
Chris@102: // Note: the implementation of this utility contains various workarounds:
Chris@102: // - swap_impl is put outside the boost namespace, to avoid infinite
Chris@102: // recursion (causing stack overflow) when swapping objects of a primitive
Chris@102: // type.
Chris@102: // - swap_impl has a using-directive, rather than a using-declaration,
Chris@102: // because some compilers (including MSVC 7.1, Borland 5.9.3, and
Chris@102: // Intel 8.1) don't do argument-dependent lookup when it has a
Chris@102: // using-declaration instead.
Chris@102: // - boost::swap has two template arguments, instead of one, to
Chris@102: // avoid ambiguity when swapping objects of a Boost type that does
Chris@102: // not have its own boost::swap overload.
Chris@102: 
Chris@102: #include <utility> //for std::swap (C++11)
Chris@102: #include <algorithm> //for std::swap (C++98)
Chris@102: #include <cstddef> //for std::size_t
Chris@102: #include <boost/config.hpp>
Chris@102: 
Chris@102: namespace boost_swap_impl
Chris@102: {
Chris@102:   template<class T>
Chris@102:   BOOST_GPU_ENABLED
Chris@102:   void swap_impl(T& left, T& right)
Chris@102:   {
Chris@102:     using namespace std;//use std::swap if argument dependent lookup fails
Chris@102:     swap(left,right);
Chris@102:   }
Chris@102: 
Chris@102:   template<class T, std::size_t N>
Chris@102:   BOOST_GPU_ENABLED
Chris@102:   void swap_impl(T (& left)[N], T (& right)[N])
Chris@102:   {
Chris@102:     for (std::size_t i = 0; i < N; ++i)
Chris@102:     {
Chris@102:       ::boost_swap_impl::swap_impl(left[i], right[i]);
Chris@102:     }
Chris@102:   }
Chris@102: }
Chris@102: 
Chris@102: namespace boost
Chris@102: {
Chris@102:   template<class T1, class T2>
Chris@102:   BOOST_GPU_ENABLED
Chris@102:   void swap(T1& left, T2& right)
Chris@102:   {
Chris@102:     ::boost_swap_impl::swap_impl(left, right);
Chris@102:   }
Chris@102: }
Chris@102: 
Chris@102: #endif