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//
// async_result.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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 ARCHETYPES_ASYNC_RESULT_HPP
#define ARCHETYPES_ASYNC_RESULT_HPP
#include <boost/asio/async_result.hpp>
namespace archetypes {
struct lazy_handler
{
};
template <typename Signature>
struct concrete_handler;
template <typename R, typename Arg1>
struct concrete_handler<R(Arg1)>
{
concrete_handler(lazy_handler)
{
}
void operator()(typename boost::asio::decay<Arg1>::type)
{
}
#if defined(BOOST_ASIO_HAS_MOVE)
concrete_handler(concrete_handler&&) {}
private:
concrete_handler(const concrete_handler&);
#endif // defined(BOOST_ASIO_HAS_MOVE)
};
template <typename R, typename Arg1, typename Arg2>
struct concrete_handler<R(Arg1, Arg2)>
{
concrete_handler(lazy_handler)
{
}
void operator()(typename boost::asio::decay<Arg1>::type, typename boost::asio::decay<Arg2>::type)
{
}
#if defined(BOOST_ASIO_HAS_MOVE)
concrete_handler(concrete_handler&&) {}
private:
concrete_handler(const concrete_handler&);
#endif // defined(BOOST_ASIO_HAS_MOVE)
};
} // namespace archetypes
namespace boost {
namespace asio {
template <typename Signature>
class async_result<archetypes::lazy_handler, Signature>
{
public:
// The concrete completion handler type.
typedef archetypes::concrete_handler<Signature> completion_handler_type;
// The return type of the initiating function.
typedef int return_type;
// Construct an async_result from a given handler.
explicit async_result(completion_handler_type&)
{
}
// Obtain the value to be returned from the initiating function.
return_type get()
{
return 42;
}
private:
// Disallow copying and assignment.
async_result(const async_result&) BOOST_ASIO_DELETED;
async_result& operator=(const async_result&) BOOST_ASIO_DELETED;
};
} // namespace asio
} // namespace boost
#endif // ARCHETYPES_ASYNC_RESULT_HPP
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