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Added explanatory comments, requested by Isaac Dupree, "Re: [boost] [swap] Renaming boost_swap_impl::swap_impl and/or its namespace?", http://lists.boost.org/Archives/boost/2008/08/141007.php

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[SVN r48171]
This commit is contained in:
Niels Dekker 2008-08-16 08:56:19 +00:00
parent 782c132d99
commit 5c42397244
1 changed files with 12 additions and 0 deletions
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include/boost/utility/swap.hpp
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@ -9,6 +9,18 @@
#ifndef BOOST_UTILITY_SWAP_HPP #ifndef BOOST_UTILITY_SWAP_HPP
#define 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 <algorithm> //for std::swap
#include <cstddef> //for std::size_t #include <cstddef> //for std::size_t