1 // Copyright (C) 2007, 2008 Steven Watanabe, Joseph Gauterin, Niels Dekker
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3 // Distributed under the Boost Software License, Version 1.0. (See
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4 // accompanying file LICENSE_1_0.txt or copy at
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5 // http://www.boost.org/LICENSE_1_0.txt)
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6 // For more information, see http://www.boost.org
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9 #ifndef BOOST_UTILITY_SWAP_HPP
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10 #define BOOST_UTILITY_SWAP_HPP
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12 // Note: the implementation of this utility contains various workarounds:
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13 // - swap_impl is put outside the boost namespace, to avoid infinite
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14 // recursion (causing stack overflow) when swapping objects of a primitive
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16 // - swap_impl has a using-directive, rather than a using-declaration,
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17 // because some compilers (including MSVC 7.1, Borland 5.9.3, and
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18 // Intel 8.1) don't do argument-dependent lookup when it has a
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19 // using-declaration instead.
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20 // - boost::swap has two template arguments, instead of one, to
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21 // avoid ambiguity when swapping objects of a Boost type that does
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22 // not have its own boost::swap overload.
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24 #include <algorithm> //for std::swap
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25 #include <cstddef> //for std::size_t
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27 namespace boost_swap_impl
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30 void swap_impl(T& left, T& right)
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32 using namespace std;//use std::swap if argument dependent lookup fails
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36 template<class T, std::size_t N>
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37 void swap_impl(T (& left)[N], T (& right)[N])
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39 for (std::size_t i = 0; i < N; ++i)
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41 ::boost_swap_impl::swap_impl(left[i], right[i]);
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48 template<class T1, class T2>
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49 void swap(T1& left, T2& right)
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51 ::boost_swap_impl::swap_impl(left, right);
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