/usr/include/boost/asio/execution
Edit: /usr/include/boost/asio/execution/context.hpp (5574B)
//
// execution/context.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 BOOST_ASIO_EXECUTION_CONTEXT2_HPP
#define BOOST_ASIO_EXECUTION_CONTEXT2_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include
#include
#include
#include
#include
#include
#include
#include
#if defined(BOOST_ASIO_HAS_STD_ANY)
# include
#endif // defined(BOOST_ASIO_HAS_STD_ANY)
#include
namespace boost {
namespace asio {
#if defined(GENERATING_DOCUMENTATION)
namespace execution {
/// A property that is used to obtain the execution context that is associated
/// with an executor.
struct context_t
{
/// The context_t property applies to executors, senders, and schedulers.
template
static constexpr bool is_applicable_property_v =
is_executor_v || is_sender_v || is_scheduler_v;
/// The context_t property cannot be required.
static constexpr bool is_requirable = false;
/// The context_t property cannot be preferred.
static constexpr bool is_preferable = false;
/// The type returned by queries against an @c any_executor.
typedef std::any polymorphic_query_result_type;
};
/// A special value used for accessing the context_t property.
constexpr context_t context;
} // namespace execution
#else // defined(GENERATING_DOCUMENTATION)
namespace execution {
namespace detail {
template
struct context_t
{
#if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
template
BOOST_ASIO_STATIC_CONSTEXPR(bool,
is_applicable_property_v = is_executor::value
|| is_sender::value || is_scheduler::value);
#endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = false);
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = false);
#if defined(BOOST_ASIO_HAS_STD_ANY)
typedef std::any polymorphic_query_result_type;
#endif // defined(BOOST_ASIO_HAS_STD_ANY)
BOOST_ASIO_CONSTEXPR context_t()
{
}
#if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template
static BOOST_ASIO_CONSTEXPR
typename traits::query_static_constexpr_member::result_type
static_query()
BOOST_ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member::is_noexcept))
{
return traits::query_static_constexpr_member::value();
}
template ())>
static BOOST_ASIO_CONSTEXPR const T static_query_v
= context_t::static_query();
#endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
#if !defined(BOOST_ASIO_HAS_CONSTEXPR)
static const context_t instance;
#endif // !defined(BOOST_ASIO_HAS_CONSTEXPR)
};
#if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template template
const T context_t::static_query_v;
#endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
#if !defined(BOOST_ASIO_HAS_CONSTEXPR)
template
const context_t context_t::instance;
#endif
} // namespace detail
typedef detail::context_t<> context_t;
#if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
constexpr context_t context;
#else // defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
namespace { static const context_t& context = context_t::instance; }
#endif
} // namespace execution
#if !defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
template
struct is_applicable_property
: integral_constant::value
|| execution::is_sender::value
|| execution::is_scheduler::value>
{
};
#endif // !defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
namespace traits {
#if !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
|| !defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template
struct static_query::is_valid
>::type>
{
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
typedef typename traits::query_static_constexpr_member::result_type result_type;
static BOOST_ASIO_CONSTEXPR result_type value()
{
return traits::query_static_constexpr_member::value();
}
};
#endif // !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// || !defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
} // namespace traits
#endif // defined(GENERATING_DOCUMENTATION)
} // namespace asio
} // namespace boost
#include
#endif // BOOST_ASIO_EXECUTION_CONTEXT2_HPP