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/*
(c) 2014 Glen Joseph Fernandes
glenjofe at gmail dot 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/config.hpp>
#include <boost/static_assert.hpp>
#include <boost/align/align.hpp>
#include <boost/align/aligned_allocator_adaptor_forward.hpp>
#include <boost/align/alignment_of.hpp>
#include <boost/align/detail/addressof.hpp>
#include <boost/align/detail/is_alignment_constant.hpp>
#include <boost/align/detail/max_align.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> CharAlloc;
typedef typename Traits::
template rebind_traits<char> CharTraits;
typedef typename CharTraits::pointer CharPtr;
#else
typedef typename Allocator::
template rebind<char>::other CharAlloc;
typedef typename CharAlloc::pointer CharPtr;
#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:
typedef detail::max_align<Alignment,
detail::max_align<alignment_of<value_type>::value,
alignment_of<CharPtr>::value>::value> MaxAlign;
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 n1 = size * sizeof(value_type);
std::size_t n2 = n1 + MaxAlign::value - 1;
CharAlloc a(base());
CharPtr p1 = a.allocate(sizeof p1 + n2);
void* p2 = detail::addressof(*p1) + sizeof p1;
(void)align(MaxAlign::value, n1, p2, n2);
void* p3 = static_cast<CharPtr*>(p2) - 1;
::new(p3) CharPtr(p1);
return static_cast<pointer>(p2);
}
pointer allocate(size_type size, const_void_pointer hint) {
std::size_t n1 = size * sizeof(value_type);
std::size_t n2 = n1 + MaxAlign::value - 1;
CharPtr h = CharPtr();
if (hint) {
h = *(static_cast<const CharPtr*>(hint) - 1);
}
CharAlloc a(base());
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
CharPtr p1 = CharTraits::allocate(a, sizeof p1 +
n2, h);
#else
CharPtr p1 = a.allocate(sizeof p1 + n2, h);
#endif
void* p2 = detail::addressof(*p1) + sizeof p1;
(void)align(MaxAlign::value, n1, p2, n2);
void* p3 = static_cast<CharPtr*>(p2) - 1;
::new(p3) CharPtr(p1);
return static_cast<pointer>(p2);
}
void deallocate(pointer ptr, size_type size) {
CharPtr* p1 = reinterpret_cast<CharPtr*>(ptr) - 1;
CharPtr p2 = *p1;
p1->~CharPtr();
CharAlloc a(base());
a.deallocate(p2, size * sizeof(value_type) +
MaxAlign::value + sizeof p2);
}
};
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);
}
}
}
#endif
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