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/*
(c) 2014-2015 Glen Joseph Fernandes
<glenjofe -at- gmail.com>
Distributed under the Boost Software
License, Version 1.0.
http://boost.org/LICENSE_1_0.txt
*/
#ifndef BOOST_ALIGN_ALIGNED_ALLOCATOR_ADAPTOR_HPP
#define BOOST_ALIGN_ALIGNED_ALLOCATOR_ADAPTOR_HPP
#include <boost/align/detail/addressof.hpp>
#include <boost/align/detail/is_alignment_constant.hpp>
#include <boost/align/detail/max_align.hpp>
#include <boost/align/detail/max_size.hpp>
#include <boost/align/align.hpp>
#include <boost/align/aligned_allocator_adaptor_forward.hpp>
#include <boost/align/alignment_of.hpp>
#include <boost/static_assert.hpp>
#include <new>
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
#include <memory>
#endif
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
#include <utility>
#endif
namespace boost {
namespace alignment {
template<class Allocator, std::size_t Alignment>
class aligned_allocator_adaptor
: public Allocator {
BOOST_STATIC_ASSERT(detail::
is_alignment_constant<Alignment>::value);
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
typedef std::allocator_traits<Allocator> traits;
typedef typename traits::
template rebind_alloc<char> char_alloc;
typedef typename traits::
template rebind_traits<char> char_traits;
typedef typename char_traits::pointer char_ptr;
#else
typedef typename Allocator::
template rebind<char>::other char_alloc;
typedef typename char_alloc::pointer char_ptr;
#endif
public:
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
typedef typename traits::value_type value_type;
typedef typename traits::size_type size_type;
#else
typedef typename Allocator::value_type value_type;
typedef typename Allocator::size_type size_type;
#endif
typedef value_type* pointer;
typedef const value_type* const_pointer;
typedef void* void_pointer;
typedef const void* const_void_pointer;
typedef std::ptrdiff_t difference_type;
private:
enum {
min_align = detail::max_size<Alignment,
detail::max_align<value_type, char_ptr>::value>::value
};
public:
template<class U>
struct rebind {
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
typedef aligned_allocator_adaptor<typename traits::
template rebind_alloc<U>, Alignment> other;
#else
typedef aligned_allocator_adaptor<typename Allocator::
template rebind<U>::other, Alignment> other;
#endif
};
#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
aligned_allocator_adaptor() = default;
#else
aligned_allocator_adaptor()
: Allocator() {
}
#endif
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template<class A>
explicit aligned_allocator_adaptor(A&& alloc) BOOST_NOEXCEPT
: Allocator(std::forward<A>(alloc)) {
}
#else
template<class A>
explicit aligned_allocator_adaptor(const A& alloc)
BOOST_NOEXCEPT
: Allocator(alloc) {
}
#endif
template<class U>
aligned_allocator_adaptor(const aligned_allocator_adaptor<U,
Alignment>& other) BOOST_NOEXCEPT
: Allocator(other.base()) {
}
Allocator& base() BOOST_NOEXCEPT {
return static_cast<Allocator&>(*this);
}
const Allocator& base() const BOOST_NOEXCEPT {
return static_cast<const Allocator&>(*this);
}
pointer allocate(size_type size) {
std::size_t s = size * sizeof(value_type);
std::size_t n = s + min_align - 1;
char_alloc a(base());
char_ptr p = a.allocate(sizeof p + n);
void* r = detail::addressof(*p) + sizeof p;
(void)align(min_align, s, r, n);
::new(static_cast<void*>(static_cast<char_ptr*>(r) -
1)) char_ptr(p);
return static_cast<pointer>(r);
}
pointer allocate(size_type size, const_void_pointer hint) {
std::size_t s = size * sizeof(value_type);
std::size_t n = s + min_align - 1;
char_ptr h = char_ptr();
if (hint) {
h = *(static_cast<const char_ptr*>(hint) - 1);
}
char_alloc a(base());
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
char_ptr p = char_traits::allocate(a, sizeof p + n, h);
#else
char_ptr p = a.allocate(sizeof p + n, h);
#endif
void* r = detail::addressof(*p) + sizeof p;
(void)align(min_align, s, r, n);
::new(static_cast<void*>(static_cast<char_ptr*>(r) -
1)) char_ptr(p);
return static_cast<pointer>(r);
}
void deallocate(pointer ptr, size_type size) {
char_ptr* p = reinterpret_cast<char_ptr*>(ptr) - 1;
char_ptr r = *p;
p->~char_ptr();
char_alloc a(base());
a.deallocate(r, sizeof r + size * sizeof(value_type) +
min_align - 1);
}
};
template<class A1, class A2, std::size_t Alignment>
inline bool operator==(const aligned_allocator_adaptor<A1,
Alignment>& a, const aligned_allocator_adaptor<A2,
Alignment>& b) BOOST_NOEXCEPT
{
return a.base() == b.base();
}
template<class A1, class A2, std::size_t Alignment>
inline bool operator!=(const aligned_allocator_adaptor<A1,
Alignment>& a, const aligned_allocator_adaptor<A2,
Alignment>& b) BOOST_NOEXCEPT
{
return !(a == b);
}
} /* .alignment */
} /* .boost */
#endif
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