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/*
Copyright 2014-2015 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_ALIGNED_ALLOCATOR_HPP
#define BOOST_ALIGN_ALIGNED_ALLOCATOR_HPP
#include <boost/align/detail/addressof.hpp>
#include <boost/align/detail/is_alignment_constant.hpp>
#include <boost/align/detail/max_objects.hpp>
#include <boost/align/detail/max_size.hpp>
#include <boost/align/aligned_alloc.hpp>
#include <boost/align/aligned_allocator_forward.hpp>
#include <boost/align/alignment_of.hpp>
#include <boost/static_assert.hpp>
#include <boost/throw_exception.hpp>
#include <new>
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
#include <utility>
#endif
namespace boost {
namespace alignment {
template<class T, std::size_t Alignment>
class aligned_allocator {
BOOST_STATIC_ASSERT(detail::
is_alignment_constant<Alignment>::value);
public:
typedef T value_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef void* void_pointer;
typedef const void* const_void_pointer;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef T& reference;
typedef const T& const_reference;
private:
enum {
min_align = detail::max_size<Alignment,
alignment_of<value_type>::value>::value
};
public:
template<class U>
struct rebind {
typedef aligned_allocator<U, Alignment> other;
};
#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)
aligned_allocator() = default;
#else
aligned_allocator() BOOST_NOEXCEPT { }
#endif
template<class U>
aligned_allocator(const aligned_allocator<U, Alignment>&)
BOOST_NOEXCEPT { }
pointer address(reference value) const BOOST_NOEXCEPT {
return detail::addressof(value);
}
const_pointer address(const_reference value) const BOOST_NOEXCEPT {
return detail::addressof(value);
}
pointer allocate(size_type size, const_void_pointer = 0) {
if (size == 0) {
return 0;
}
void* p = aligned_alloc(min_align, sizeof(T) * size);
if (!p) {
boost::throw_exception(std::bad_alloc());
}
return static_cast<T*>(p);
}
void deallocate(pointer ptr, size_type) {
boost::alignment::aligned_free(ptr);
}
BOOST_CONSTEXPR size_type max_size() const BOOST_NOEXCEPT {
return detail::max_objects<T>::value;
}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
template<class U, class... Args>
void construct(U* ptr, Args&&... args) {
::new((void*)ptr) U(std::forward<Args>(args)...);
}
#else
template<class U, class V>
void construct(U* ptr, V&& value) {
::new((void*)ptr) U(std::forward<V>(value));
}
#endif
#else
template<class U, class V>
void construct(U* ptr, const V& value) {
::new((void*)ptr) U(value);
}
#endif
template<class U>
void construct(U* ptr) {
::new((void*)ptr) U();
}
template<class U>
void destroy(U* ptr) {
(void)ptr;
ptr->~U();
}
};
template<std::size_t Alignment>
class aligned_allocator<void, Alignment> {
BOOST_STATIC_ASSERT(detail::
is_alignment_constant<Alignment>::value);
public:
typedef void value_type;
typedef void* pointer;
typedef const void* const_pointer;
template<class U>
struct rebind {
typedef aligned_allocator<U, Alignment> other;
};
};
template<class T, class U, std::size_t Alignment>
inline bool
operator==(const aligned_allocator<T, Alignment>&,
const aligned_allocator<U, Alignment>&) BOOST_NOEXCEPT
{
return true;
}
template<class T, class U, std::size_t Alignment>
inline bool
operator!=(const aligned_allocator<T, Alignment>&,
const aligned_allocator<U, Alignment>&) BOOST_NOEXCEPT
{
return false;
}
} /* alignment */
} /* boost */
#endif
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