prepend.hpp
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//
// impl/prepend.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 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 BOOST_ASIO_IMPL_PREPEND_HPP
#define BOOST_ASIO_IMPL_PREPEND_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <boost/asio/associator.hpp>
#include <boost/asio/async_result.hpp>
#include <boost/asio/detail/handler_alloc_helpers.hpp>
#include <boost/asio/detail/handler_cont_helpers.hpp>
#include <boost/asio/detail/handler_invoke_helpers.hpp>
#include <boost/asio/detail/type_traits.hpp>
#include <boost/asio/detail/utility.hpp>
#include <boost/asio/detail/variadic_templates.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
// Class to adapt a prepend_t as a completion handler.
template <typename Handler, typename... Values>
class prepend_handler
{
public:
typedef void result_type;
template <typename H>
prepend_handler(BOOST_ASIO_MOVE_ARG(H) handler, std::tuple<Values...> values)
: handler_(BOOST_ASIO_MOVE_CAST(H)(handler)),
values_(BOOST_ASIO_MOVE_CAST(std::tuple<Values...>)(values))
{
}
template <typename... Args>
void operator()(BOOST_ASIO_MOVE_ARG(Args)... args)
{
this->invoke(
index_sequence_for<Values...>{},
BOOST_ASIO_MOVE_CAST(Args)(args)...);
}
template <std::size_t... I, typename... Args>
void invoke(index_sequence<I...>, BOOST_ASIO_MOVE_ARG(Args)... args)
{
BOOST_ASIO_MOVE_OR_LVALUE(Handler)(handler_)(
BOOST_ASIO_MOVE_CAST(Values)(std::get<I>(values_))...,
BOOST_ASIO_MOVE_CAST(Args)(args)...);
}
//private:
Handler handler_;
std::tuple<Values...> values_;
};
template <typename Handler>
inline asio_handler_allocate_is_deprecated
asio_handler_allocate(std::size_t size,
prepend_handler<Handler>* this_handler)
{
#if defined(BOOST_ASIO_NO_DEPRECATED)
boost_asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
return asio_handler_allocate_is_no_longer_used();
#else // defined(BOOST_ASIO_NO_DEPRECATED)
return boost_asio_handler_alloc_helpers::allocate(
size, this_handler->handler_);
#endif // defined(BOOST_ASIO_NO_DEPRECATED)
}
template <typename Handler>
inline asio_handler_deallocate_is_deprecated
asio_handler_deallocate(void* pointer, std::size_t size,
prepend_handler<Handler>* this_handler)
{
boost_asio_handler_alloc_helpers::deallocate(
pointer, size, this_handler->handler_);
#if defined(BOOST_ASIO_NO_DEPRECATED)
return asio_handler_deallocate_is_no_longer_used();
#endif // defined(BOOST_ASIO_NO_DEPRECATED)
}
template <typename Handler>
inline bool asio_handler_is_continuation(
prepend_handler<Handler>* this_handler)
{
return boost_asio_handler_cont_helpers::is_continuation(
this_handler->handler_);
}
template <typename Function, typename Handler>
inline asio_handler_invoke_is_deprecated
asio_handler_invoke(Function& function,
prepend_handler<Handler>* this_handler)
{
boost_asio_handler_invoke_helpers::invoke(
function, this_handler->handler_);
#if defined(BOOST_ASIO_NO_DEPRECATED)
return asio_handler_invoke_is_no_longer_used();
#endif // defined(BOOST_ASIO_NO_DEPRECATED)
}
template <typename Function, typename Handler>
inline asio_handler_invoke_is_deprecated
asio_handler_invoke(const Function& function,
prepend_handler<Handler>* this_handler)
{
boost_asio_handler_invoke_helpers::invoke(
function, this_handler->handler_);
#if defined(BOOST_ASIO_NO_DEPRECATED)
return asio_handler_invoke_is_no_longer_used();
#endif // defined(BOOST_ASIO_NO_DEPRECATED)
}
template <typename Signature, typename... Values>
struct prepend_signature;
template <typename R, typename... Args, typename... Values>
struct prepend_signature<R(Args...), Values...>
{
typedef R type(Values..., typename decay<Args>::type...);
};
} // namespace detail
#if !defined(GENERATING_DOCUMENTATION)
template <typename CompletionToken, typename... Values, typename Signature>
struct async_result<
prepend_t<CompletionToken, Values...>, Signature>
: async_result<CompletionToken,
typename detail::prepend_signature<
Signature, Values...>::type>
{
typedef typename detail::prepend_signature<
Signature, Values...>::type signature;
template <typename Initiation>
struct init_wrapper
{
init_wrapper(Initiation init)
: initiation_(BOOST_ASIO_MOVE_CAST(Initiation)(init))
{
}
template <typename Handler, typename... Args>
void operator()(
BOOST_ASIO_MOVE_ARG(Handler) handler,
std::tuple<Values...> values,
BOOST_ASIO_MOVE_ARG(Args)... args)
{
BOOST_ASIO_MOVE_CAST(Initiation)(initiation_)(
detail::prepend_handler<
typename decay<Handler>::type, Values...>(
BOOST_ASIO_MOVE_CAST(Handler)(handler),
BOOST_ASIO_MOVE_CAST(std::tuple<Values...>)(values)),
BOOST_ASIO_MOVE_CAST(Args)(args)...);
}
Initiation initiation_;
};
template <typename Initiation, typename RawCompletionToken, typename... Args>
static BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(CompletionToken, signature,
(async_initiate<CompletionToken, signature>(
declval<init_wrapper<typename decay<Initiation>::type> >(),
declval<CompletionToken&>(),
declval<std::tuple<Values...> >(),
declval<BOOST_ASIO_MOVE_ARG(Args)>()...)))
initiate(
BOOST_ASIO_MOVE_ARG(Initiation) initiation,
BOOST_ASIO_MOVE_ARG(RawCompletionToken) token,
BOOST_ASIO_MOVE_ARG(Args)... args)
{
return async_initiate<CompletionToken, signature>(
init_wrapper<typename decay<Initiation>::type>(
BOOST_ASIO_MOVE_CAST(Initiation)(initiation)),
token.token_,
BOOST_ASIO_MOVE_CAST(std::tuple<Values...>)(token.values_),
BOOST_ASIO_MOVE_CAST(Args)(args)...);
}
};
template <template <typename, typename> class Associator,
typename Handler, typename... Values, typename DefaultCandidate>
struct associator<Associator,
detail::prepend_handler<Handler, Values...>, DefaultCandidate>
: Associator<Handler, DefaultCandidate>
{
static typename Associator<Handler, DefaultCandidate>::type
get(const detail::prepend_handler<Handler, Values...>& h) BOOST_ASIO_NOEXCEPT
{
return Associator<Handler, DefaultCandidate>::get(h.handler_);
}
static BOOST_ASIO_AUTO_RETURN_TYPE_PREFIX2(
typename Associator<Handler, DefaultCandidate>::type)
get(const detail::prepend_handler<Handler, Values...>& h,
const DefaultCandidate& c) BOOST_ASIO_NOEXCEPT
BOOST_ASIO_AUTO_RETURN_TYPE_SUFFIX((
Associator<Handler, DefaultCandidate>::get(h.handler_, c)))
{
return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
}
};
#endif // !defined(GENERATING_DOCUMENTATION)
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_IMPL_PREPEND_HPP