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/*
* Copyright (c) 2012-2014 Glen Joseph Fernandes
* glenfe at live dot com
*
* Distributed under the Boost Software License,
* Version 1.0. (See accompanying file LICENSE_1_0.txt
* or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_SMART_PTR_DETAIL_ARRAY_ALLOCATOR_HPP
#define BOOST_SMART_PTR_DETAIL_ARRAY_ALLOCATOR_HPP
#include <boost/align/align.hpp>
#include <boost/smart_ptr/detail/array_traits.hpp>
#include <boost/smart_ptr/detail/array_utility.hpp>
#include <boost/type_traits/alignment_of.hpp>
namespace boost {
namespace detail {
struct ms_init_tag { };
struct ms_noinit_tag { };
template<class T>
struct ms_allocator_state;
template<class T>
struct ms_allocator_state<T[]> {
typedef typename array_base<T>::type type;
ms_allocator_state(std::size_t size_,
type** result_)
: size(size_ * array_total<T>::size),
result(result_) {
}
std::size_t size;
union {
type** result;
type* object;
};
};
template<class T, std::size_t N>
struct ms_allocator_state<T[N]> {
typedef typename array_base<T>::type type;
ms_allocator_state(type** result_)
: result(result_) {
}
enum {
size = array_total<T[N]>::size
};
union {
type** result;
type* object;
};
};
template<class A, class T, class R>
class as_allocator
: public A {
template<class A_, class T_, class R_>
friend class as_allocator;
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
typedef std::allocator_traits<A> AT;
typedef typename AT::template rebind_alloc<char> CA;
typedef typename AT::template rebind_traits<char> CT;
#else
typedef typename A::template rebind<char>::other CA;
#endif
public:
typedef A allocator_type;
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
typedef typename AT::value_type value_type;
typedef typename AT::pointer pointer;
typedef typename AT::const_pointer const_pointer;
typedef typename AT::void_pointer void_pointer;
typedef typename AT::const_void_pointer const_void_pointer;
typedef typename AT::size_type size_type;
typedef typename AT::difference_type difference_type;
#else
typedef typename A::value_type value_type;
typedef typename A::pointer pointer;
typedef typename A::const_pointer const_pointer;
typedef typename A::size_type size_type;
typedef typename A::difference_type difference_type;
typedef typename A::reference reference;
typedef typename A::const_reference const_reference;
typedef void* void_pointer;
typedef const void* const_void_pointer;
#endif
template<class U>
struct rebind {
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
typedef as_allocator<typename AT::
template rebind_alloc<U>, T, R> other;
#else
typedef as_allocator<typename A::
template rebind<U>::other, T, R> other;
#endif
};
typedef typename array_base<T>::type type;
as_allocator(const A& allocator_, type** result)
: A(allocator_),
data(result) {
}
as_allocator(const A& allocator_, std::size_t size,
type** result)
: A(allocator_),
data(size, result) {
}
template<class U>
as_allocator(const as_allocator<U, T, R>& other)
: A(other.allocator()),
data(other.data) {
}
pointer allocate(size_type count, const_void_pointer = 0) {
enum {
M = boost::alignment_of<type>::value
};
std::size_t n1 = count * sizeof(value_type);
std::size_t n2 = data.size * sizeof(type);
std::size_t n3 = n2 + M;
CA ca(allocator());
void* p1 = ca.allocate(n1 + n3);
void* p2 = static_cast<char*>(p1) + n1;
(void)boost::alignment::align(M, n2, p2, n3);
*data.result = static_cast<type*>(p2);
return static_cast<value_type*>(p1);
}
void deallocate(pointer memory, size_type count) {
enum {
M = boost::alignment_of<type>::value
};
std::size_t n1 = count * sizeof(value_type);
std::size_t n2 = data.size * sizeof(type) + M;
char* p1 = reinterpret_cast<char*>(memory);
CA ca(allocator());
ca.deallocate(p1, n1 + n2);
}
const A& allocator() const {
return static_cast<const A&>(*this);
}
A& allocator() {
return static_cast<A&>(*this);
}
void set(type* memory) {
data.object = memory;
}
void operator()() {
if (data.object) {
R tag;
release(tag);
}
}
private:
void release(ms_init_tag) {
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
as_destroy(allocator(), data.object, data.size);
#else
ms_destroy(data.object, data.size);
#endif
}
void release(ms_noinit_tag) {
ms_destroy(data.object, data.size);
}
ms_allocator_state<T> data;
};
template<class A1, class A2, class T, class R>
bool operator==(const as_allocator<A1, T, R>& a1,
const as_allocator<A2, T, R>& a2) {
return a1.allocator() == a2.allocator();
}
template<class A1, class A2, class T, class R>
bool operator!=(const as_allocator<A1, T, R>& a1,
const as_allocator<A2, T, R>& a2) {
return a1.allocator() != a2.allocator();
}
template<class T, class Y = char>
class ms_allocator;
template<class T, class Y>
class ms_allocator {
template<class T_, class Y_>
friend class ms_allocator;
public:
typedef typename array_base<T>::type type;
typedef Y value_type;
typedef Y* pointer;
typedef const Y* const_pointer;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef Y& reference;
typedef const Y& const_reference;
template<class U>
struct rebind {
typedef ms_allocator<T, U> other;
};
ms_allocator(type** result)
: data(result) {
}
ms_allocator(std::size_t size, type** result)
: data(size, result) {
}
template<class U>
ms_allocator(const ms_allocator<T, U>& other)
: data(other.data) {
}
pointer allocate(size_type count, const void* = 0) {
enum {
M = boost::alignment_of<type>::value
};
std::size_t n1 = count * sizeof(Y);
std::size_t n2 = data.size * sizeof(type);
std::size_t n3 = n2 + M;
void* p1 = ::operator new(n1 + n3);
void* p2 = static_cast<char*>(p1) + n1;
(void)boost::alignment::align(M, n2, p2, n3);
*data.result = static_cast<type*>(p2);
return static_cast<Y*>(p1);
}
void deallocate(pointer memory, size_type) {
void* p1 = memory;
::operator delete(p1);
}
#if defined(BOOST_NO_CXX11_ALLOCATOR)
pointer address(reference value) const {
return &value;
}
const_pointer address(const_reference value) const {
return &value;
}
size_type max_size() const {
enum {
N = static_cast<std::size_t>(-1) / sizeof(Y)
};
return N;
}
void construct(pointer memory, const_reference value) {
void* p1 = memory;
::new(p1) Y(value);
}
void destroy(pointer memory) {
(void)memory;
memory->~Y();
}
#endif
void set(type* memory) {
data.object = memory;
}
void operator()() {
if (data.object) {
ms_destroy(data.object, data.size);
}
}
private:
ms_allocator_state<T> data;
};
template<class T, class Y1, class Y2>
bool operator==(const ms_allocator<T, Y1>&,
const ms_allocator<T, Y2>&) {
return true;
}
template<class T, class Y1, class Y2>
bool operator!=(const ms_allocator<T, Y1>&,
const ms_allocator<T, Y2>&) {
return false;
}
class ms_in_allocator_tag {
public:
void operator()(const void*) {
}
};
}
}
#endif
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