/usr/include/boost/asio/execution
Edit: /usr/include/boost/asio/execution/context_as.hpp (6328B)
//
// execution/context_as.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_CONTEXT_AS_HPP
#define BOOST_ASIO_EXECUTION_CONTEXT_AS_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
#include
#include
#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.
template
struct context_as_t
{
/// The context_as_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 T polymorphic_query_result_type;
};
/// A special value used for accessing the context_as_t property.
template
constexpr context_as_t context_as;
} // namespace execution
#else // defined(GENERATING_DOCUMENTATION)
namespace execution {
template
struct context_as_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);
typedef T polymorphic_query_result_type;
BOOST_ASIO_CONSTEXPR context_as_t()
{
}
BOOST_ASIO_CONSTEXPR context_as_t(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 U static_query_v
= context_as_t::static_query();
#endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template
friend BOOST_ASIO_CONSTEXPR U query(
const Executor& ex, const context_as_t&,
typename enable_if<
is_same::value
&& can_query::value
>::type* = 0)
#if !defined(__clang__) // Clang crashes if noexcept is used here.
#if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified.
BOOST_ASIO_NOEXCEPT_IF((
is_nothrow_query::value))
#else // defined(BOOST_ASIO_MSVC)
BOOST_ASIO_NOEXCEPT_IF((
is_nothrow_query::value))
#endif // defined(BOOST_ASIO_MSVC)
#endif // !defined(__clang__)
{
return boost::asio::query(ex, context);
}
};
#if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template template
const U context_as_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_VARIABLE_TEMPLATES) \
&& defined(BOOST_ASIO_HAS_CONSTEXPR)) \
|| defined(GENERATING_DOCUMENTATION)
template
constexpr context_as_t context_as{};
#endif // (defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
// && defined(BOOST_ASIO_HAS_CONSTEXPR))
// || defined(GENERATING_DOCUMENTATION)
} // 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,
typename enable_if<
static_query::is_valid
>::type> : static_query
{
};
#endif // !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// || !defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
#if !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
template
struct query_free,
typename enable_if<
can_query::value
>::type>
{
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
(is_nothrow_query::value));
typedef U result_type;
};
#endif // !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
} // namespace traits
#endif // defined(GENERATING_DOCUMENTATION)
} // namespace asio
} // namespace boost
#include
#endif // BOOST_ASIO_EXECUTION_CONTEXT_AS_HPP