mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-21 04:11:50 +03:00
95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
//
|
|
// use_future.hpp
|
|
// ~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2016 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_USE_FUTURE_HPP
|
|
#define BOOST_ASIO_USE_FUTURE_HPP
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
# pragma once
|
|
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
|
|
#include <boost/asio/detail/config.hpp>
|
|
#include <memory>
|
|
|
|
#include <boost/asio/detail/push_options.hpp>
|
|
|
|
namespace boost {
|
|
namespace asio {
|
|
|
|
/// Class used to specify that an asynchronous operation should return a future.
|
|
/**
|
|
* The use_future_t class is used to indicate that an asynchronous operation
|
|
* should return a std::future object. A use_future_t object may be passed as a
|
|
* handler to an asynchronous operation, typically using the special value @c
|
|
* boost::asio::use_future. For example:
|
|
*
|
|
* @code std::future<std::size_t> my_future
|
|
* = my_socket.async_read_some(my_buffer, boost::asio::use_future); @endcode
|
|
*
|
|
* The initiating function (async_read_some in the above example) returns a
|
|
* future that will receive the result of the operation. If the operation
|
|
* completes with an error_code indicating failure, it is converted into a
|
|
* system_error and passed back to the caller via the future.
|
|
*/
|
|
template <typename Allocator = std::allocator<void> >
|
|
class use_future_t
|
|
{
|
|
public:
|
|
/// The allocator type. The allocator is used when constructing the
|
|
/// @c std::promise object for a given asynchronous operation.
|
|
typedef Allocator allocator_type;
|
|
|
|
/// Construct using default-constructed allocator.
|
|
BOOST_ASIO_CONSTEXPR use_future_t()
|
|
{
|
|
}
|
|
|
|
/// Construct using specified allocator.
|
|
explicit use_future_t(const Allocator& allocator)
|
|
: allocator_(allocator)
|
|
{
|
|
}
|
|
|
|
/// Specify an alternate allocator.
|
|
template <typename OtherAllocator>
|
|
use_future_t<OtherAllocator> operator[](const OtherAllocator& allocator) const
|
|
{
|
|
return use_future_t<OtherAllocator>(allocator);
|
|
}
|
|
|
|
/// Obtain allocator.
|
|
allocator_type get_allocator() const
|
|
{
|
|
return allocator_;
|
|
}
|
|
|
|
private:
|
|
Allocator allocator_;
|
|
};
|
|
|
|
/// A special value, similar to std::nothrow.
|
|
/**
|
|
* See the documentation for boost::asio::use_future_t for a usage example.
|
|
*/
|
|
#if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
|
|
constexpr use_future_t<> use_future;
|
|
#elif defined(BOOST_ASIO_MSVC)
|
|
__declspec(selectany) use_future_t<> use_future;
|
|
#endif
|
|
|
|
} // namespace asio
|
|
} // namespace boost
|
|
|
|
#include <boost/asio/detail/pop_options.hpp>
|
|
|
|
#include <boost/asio/impl/use_future.hpp>
|
|
|
|
#endif // BOOST_ASIO_USE_FUTURE_HPP
|