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//
// detail/recycling_allocator.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_DETAIL_RECYCLING_ALLOCATOR_HPP
#define ASIO_DETAIL_RECYCLING_ALLOCATOR_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/thread_context.hpp"
#include "asio/detail/thread_info_base.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename T>
class recycling_allocator
{
public:
typedef T value_type;
template <typename U>
struct rebind
{
typedef recycling_allocator<U> other;
};
recycling_allocator()
{
}
template <typename U>
recycling_allocator(const recycling_allocator<U>&)
{
}
T* allocate(std::size_t n)
{
typedef thread_context::thread_call_stack call_stack;
void* p = thread_info_base::allocate(call_stack::top(), sizeof(T) * n);
return static_cast<T*>(p);
}
void deallocate(T* p, std::size_t n)
{
typedef thread_context::thread_call_stack call_stack;
thread_info_base::deallocate(call_stack::top(), p, sizeof(T) * n);
}
};
template <>
class recycling_allocator<void>
{
public:
typedef void value_type;
template <typename U>
struct rebind
{
typedef recycling_allocator<U> other;
};
recycling_allocator()
{
}
template <typename U>
recycling_allocator(const recycling_allocator<U>&)
{
}
};
template <typename Allocator>
struct get_recycling_allocator
{
typedef Allocator type;
static type get(const Allocator& a) { return a; }
};
template <typename T>
struct get_recycling_allocator<std::allocator<T> >
{
typedef recycling_allocator<T> type;
static type get(const std::allocator<T>&) { return type(); }
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_RECYCLING_ALLOCATOR_HPP
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