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