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1 | /* |
2 | (c) 2014-2015 Glen Joseph Fernandes | |
3 | <glenjofe -at- gmail.com> | |
4 | ||
5 | Distributed under the Boost Software | |
6 | License, Version 1.0. | |
7 | http://boost.org/LICENSE_1_0.txt | |
8 | */ | |
9 | #ifndef BOOST_ALIGN_DETAIL_ALIGNED_ALLOC_HPP | |
10 | #define BOOST_ALIGN_DETAIL_ALIGNED_ALLOC_HPP | |
11 | ||
12 | #include <boost/align/detail/is_alignment.hpp> | |
13 | #include <boost/align/align.hpp> | |
14 | #include <boost/align/alignment_of.hpp> | |
15 | #include <boost/assert.hpp> | |
16 | #include <cstdlib> | |
17 | ||
18 | namespace boost { | |
19 | namespace alignment { | |
20 | ||
21 | inline void* aligned_alloc(std::size_t alignment, std::size_t size) | |
22 | BOOST_NOEXCEPT | |
23 | { | |
24 | BOOST_ASSERT(detail::is_alignment(alignment)); | |
25 | enum { | |
26 | min_align = alignment_of<void*>::value | |
27 | }; | |
28 | if (alignment < min_align) { | |
29 | alignment = min_align; | |
30 | } | |
31 | std::size_t n = size + alignment - min_align; | |
32 | void* r = 0; | |
33 | void* p = std::malloc(sizeof(void*) + n); | |
34 | if (p) { | |
35 | r = static_cast<char*>(p) + sizeof p; | |
36 | (void)align(alignment, size, r, n); | |
37 | *(static_cast<void**>(r) - 1) = p; | |
38 | } | |
39 | return r; | |
40 | } | |
41 | ||
42 | inline void aligned_free(void* ptr) BOOST_NOEXCEPT | |
43 | { | |
44 | if (ptr) { | |
45 | std::free(*(static_cast<void**>(ptr) - 1)); | |
46 | } | |
47 | } | |
48 | ||
49 | } /* .alignment */ | |
50 | } /* .boost */ | |
51 | ||
52 | #endif |