63e88f80
 Hu Chunming
提交三方库
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/*
Copyright 2014-2020 Glen Joseph Fernandes
(glenjofe@gmail.com)
Distributed under the Boost Software License, Version 1.0.
(http://www.boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_ALIGN_DETAIL_ALIGN_HPP
#define BOOST_ALIGN_DETAIL_ALIGN_HPP
#include <boost/align/detail/is_alignment.hpp>
#include <boost/assert.hpp>
namespace boost {
namespace alignment {
inline void*
align(std::size_t alignment, std::size_t size, void*& ptr,
std::size_t& space)
{
BOOST_ASSERT(boost::alignment::detail::is_alignment(alignment));
if (size <= space) {
char* p = reinterpret_cast<char*>(~(alignment - 1) &
(reinterpret_cast<std::size_t>(ptr) + alignment - 1));
std::size_t n = p - static_cast<char*>(ptr);
if (n <= space - size) {
ptr = p;
space -= n;
return p;
}
}
return 0;
}
} /* alignment */
} /* boost */
#endif
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