| // |
| // detail/handler_alloc_helpers.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2011 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 <boost/detail/workaround.hpp> |
| #include <boost/limits.hpp> |
| #include <boost/utility/addressof.hpp> |
| #include "asio/detail/noncopyable.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 BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) \ |
| || BOOST_WORKAROUND(__GNUC__, < 3) |
| return ::operator new(s); |
| #else |
| using namespace asio; |
| return asio_handler_allocate(s, boost::addressof(h)); |
| #endif |
| } |
| |
| template <typename Handler> |
| inline void deallocate(void* p, std::size_t s, Handler& h) |
| { |
| #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) \ |
| || BOOST_WORKAROUND(__GNUC__, < 3) |
| ::operator delete(p); |
| #else |
| using namespace asio; |
| asio_handler_deallocate(p, s, boost::addressof(h)); |
| #endif |
| } |
| |
| } // namespace asio_handler_alloc_helpers |
| |
| namespace asio { |
| namespace detail { |
| |
| // The default allocator simply forwards to the old-style allocation hook. |
| template <typename T, typename Context> |
| class default_handler_allocator |
| { |
| public: |
| typedef T value_type; |
| typedef value_type* pointer; |
| typedef const value_type* const_pointer; |
| typedef value_type& reference; |
| typedef const value_type& const_reference; |
| typedef std::size_t size_type; |
| typedef std::ptrdiff_t difference_type; |
| |
| template <typename U> |
| struct rebind |
| { |
| typedef default_handler_allocator<U, Context> other; |
| }; |
| |
| explicit default_handler_allocator(Context* context) |
| : context_(context) |
| { |
| } |
| |
| template <typename U> |
| default_handler_allocator(const default_handler_allocator<U, Context>& other) |
| : context_(other.context_) |
| { |
| } |
| |
| static pointer address(reference r) |
| { |
| return &r; |
| } |
| |
| static const_pointer address(const_reference r) |
| { |
| return &r; |
| } |
| |
| static size_type max_size() |
| { |
| return (std::numeric_limits<size_type>::max)(); |
| } |
| |
| static void construct(const pointer p, const value_type& v) |
| { |
| new (p) T(v); |
| } |
| |
| static void destroy(const pointer p) |
| { |
| p->~T(); |
| } |
| |
| bool operator==(const default_handler_allocator& other) const |
| { |
| return context_ == other.context_; |
| } |
| |
| bool operator!=(const default_handler_allocator& other) const |
| { |
| return context_ != other.context_; |
| } |
| |
| pointer allocate(size_type n, const void* = 0) |
| { |
| return static_cast<pointer>( |
| asio_handler_alloc_helpers::allocate(n * sizeof(T), *context_)); |
| } |
| |
| void deallocate(pointer p, size_type n) |
| { |
| return asio_handler_alloc_helpers::deallocate(p, n * sizeof(T), *context_); |
| } |
| |
| //private: |
| Context* context_; |
| }; |
| |
| // The default allocator specialised for void. |
| template <typename Context> |
| class default_handler_allocator<void, Context> |
| { |
| public: |
| typedef void value_type; |
| typedef void* pointer; |
| typedef const void* const_pointer; |
| |
| template <typename U> |
| struct rebind |
| { |
| typedef default_handler_allocator<U, Context> other; |
| }; |
| |
| explicit default_handler_allocator(Context* context) |
| : context_(context) |
| { |
| } |
| |
| template <typename U> |
| default_handler_allocator(const default_handler_allocator<U, Context>& other) |
| : context_(other.context_) |
| { |
| } |
| |
| bool operator==(const default_handler_allocator& other) const |
| { |
| return context_ == other.context_; |
| } |
| |
| bool operator!=(const default_handler_allocator& other) const |
| { |
| return context_ != other.context_; |
| } |
| |
| //private: |
| Context* context_; |
| }; |
| |
| } // namespace detail |
| } // namespace asio |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #endif // ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP |