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//
// detail/handler_alloc_helpers.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_HANDLER_ALLOC_HELPERS_HPP
#define ASIO_DETAIL_HANDLER_ALLOC_HELPERS_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/noncopyable.hpp"
#include "asio/detail/recycling_allocator.hpp"
#include "asio/associated_allocator.hpp"
#include "asio/handler_alloc_hook.hpp"
#include "asio/detail/push_options.hpp"
// Calls to asio_handler_allocate and asio_handler_deallocate must be made from
// a namespace that does not contain any overloads of these functions. The
// asio_handler_alloc_helpers namespace is defined here for that purpose.
namespace asio_handler_alloc_helpers {
template <typename Handler>
inline void* allocate(std::size_t s, Handler& h)
{
#if !defined(ASIO_HAS_HANDLER_HOOKS)
return ::operator new(s);
#else
using asio::asio_handler_allocate;
return asio_handler_allocate(s, asio::detail::addressof(h));
#endif
}
template <typename Handler>
inline void deallocate(void* p, std::size_t s, Handler& h)
{
#if !defined(ASIO_HAS_HANDLER_HOOKS)
::operator delete(p);
#else
using asio::asio_handler_deallocate;
asio_handler_deallocate(p, s, asio::detail::addressof(h));
#endif
}
} // namespace asio_handler_alloc_helpers
namespace asio {
namespace detail {
template <typename Handler, typename T>
class hook_allocator
{
public:
typedef T value_type;
template <typename U>
struct rebind
{
typedef hook_allocator<Handler, U> other;
};
explicit hook_allocator(Handler& h)
: handler_(h)
{
}
template <typename U>
hook_allocator(const hook_allocator<Handler, U>& a)
: handler_(a.handler_)
{
}
T* allocate(std::size_t n)
{
return static_cast<T*>(
asio_handler_alloc_helpers::allocate(sizeof(T) * n, handler_));
}
void deallocate(T* p, std::size_t n)
{
asio_handler_alloc_helpers::deallocate(p, sizeof(T) * n, handler_);
}
//private:
Handler& handler_;
};
template <typename Handler>
class hook_allocator<Handler, void>
{
public:
typedef void value_type;
template <typename U>
struct rebind
{
typedef hook_allocator<Handler, U> other;
};
explicit hook_allocator(Handler& h)
: handler_(h)
{
}
template <typename U>
hook_allocator(const hook_allocator<Handler, U>& a)
: handler_(a.handler_)
{
}
//private:
Handler& handler_;
};
template <typename Handler, typename Allocator>
struct get_hook_allocator
{
typedef Allocator type;
static type get(Handler&, const Allocator& a)
{
return a;
}
};
template <typename Handler, typename T>
struct get_hook_allocator<Handler, std::allocator<T> >
{
typedef hook_allocator<Handler, T> type;
static type get(Handler& handler, const std::allocator<T>&)
{
return type(handler);
}
};
} // namespace detail
} // namespace asio
#define ASIO_DEFINE_HANDLER_PTR(op) \
struct ptr \
{ \
Handler* h; \
op* v; \
op* p; \
~ptr() \
{ \
reset(); \
} \
static op* allocate(Handler& handler) \
{ \
typedef typename ::asio::associated_allocator< \
Handler>::type associated_allocator_type; \
typedef typename ::asio::detail::get_hook_allocator< \
Handler, associated_allocator_type>::type hook_allocator_type; \
ASIO_REBIND_ALLOC(hook_allocator_type, op) a( \
::asio::detail::get_hook_allocator< \
Handler, associated_allocator_type>::get( \
handler, ::asio::get_associated_allocator(handler))); \
return a.allocate(1); \
} \
void reset() \
{ \
if (p) \
{ \
p->~op(); \
p = 0; \
} \
if (v) \
{ \
typedef typename ::asio::associated_allocator< \
Handler>::type associated_allocator_type; \
typedef typename ::asio::detail::get_hook_allocator< \
Handler, associated_allocator_type>::type hook_allocator_type; \
ASIO_REBIND_ALLOC(hook_allocator_type, op) a( \
::asio::detail::get_hook_allocator< \
Handler, associated_allocator_type>::get( \
*h, ::asio::get_associated_allocator(*h))); \
a.deallocate(static_cast<op*>(v), 1); \
v = 0; \
} \
} \
} \
/**/
#define ASIO_DEFINE_HANDLER_ALLOCATOR_PTR(op) \
struct ptr \
{ \
const Alloc* a; \
void* v; \
op* p; \
~ptr() \
{ \
reset(); \
} \
static op* allocate(const Alloc& a) \
{ \
typedef typename ::asio::detail::get_recycling_allocator< \
Alloc>::type recycling_allocator_type; \
ASIO_REBIND_ALLOC(recycling_allocator_type, op) a1( \
::asio::detail::get_recycling_allocator<Alloc>::get(a)); \
return a1.allocate(1); \
} \
void reset() \
{ \
if (p) \
{ \
p->~op(); \
p = 0; \
} \
if (v) \
{ \
typedef typename ::asio::detail::get_recycling_allocator< \
Alloc>::type recycling_allocator_type; \
ASIO_REBIND_ALLOC(recycling_allocator_type, op) a1( \
::asio::detail::get_recycling_allocator<Alloc>::get(*a)); \
a1.deallocate(static_cast<op*>(v), 1); \
v = 0; \
} \
} \
} \
/**/
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP
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