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