357 lines
10 KiB
C++
357 lines
10 KiB
C++
|
//
|
||
|
|
// execution/allocator.hpp
|
||
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
//
|
||
|
|
// Copyright (c) 2003-2023 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 ASIO_EXECUTION_ALLOCATOR_HPP
|
||
|
|
#define ASIO_EXECUTION_ALLOCATOR_HPP
|
||
|
|
|
||
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
|
||
|
|
# pragma once
|
||
|
|
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
|
||
|
|
|
||
|
|
#include "asio/detail/config.hpp"
|
||
|
|
#include "asio/detail/type_traits.hpp"
|
||
|
|
#include "asio/execution/executor.hpp"
|
||
|
|
#include "asio/execution/scheduler.hpp"
|
||
|
|
#include "asio/execution/sender.hpp"
|
||
|
|
#include "asio/is_applicable_property.hpp"
|
||
|
|
#include "asio/traits/query_static_constexpr_member.hpp"
|
||
|
|
#include "asio/traits/static_query.hpp"
|
||
|
|
|
||
|
|
#include "asio/detail/push_options.hpp"
|
||
|
|
|
||
|
|
namespace asio {
|
||
|
|
|
||
|
|
#if defined(GENERATING_DOCUMENTATION)
|
||
|
|
|
||
|
|
namespace execution {
|
||
|
|
|
||
|
|
/// A property to describe which allocator an executor will use to allocate the
|
||
|
|
/// memory required to store a submitted function object.
|
||
|
|
template <typename ProtoAllocator>
|
||
|
|
struct allocator_t
|
||
|
|
{
|
||
|
|
/// The allocator_t property applies to executors, senders, and schedulers.
|
||
|
|
template <typename T>
|
||
|
|
static constexpr bool is_applicable_property_v =
|
||
|
|
is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>;
|
||
|
|
|
||
|
|
/// The allocator_t property can be required.
|
||
|
|
static constexpr bool is_requirable = true;
|
||
|
|
|
||
|
|
/// The allocator_t property can be preferred.
|
||
|
|
static constexpr bool is_preferable = true;
|
||
|
|
|
||
|
|
/// Default constructor.
|
||
|
|
constexpr allocator_t();
|
||
|
|
|
||
|
|
/// Obtain the allocator stored in the allocator_t property object.
|
||
|
|
/**
|
||
|
|
* Present only if @c ProtoAllocator is non-void.
|
||
|
|
*/
|
||
|
|
constexpr ProtoAllocator value() const;
|
||
|
|
|
||
|
|
/// Create an allocator_t object with a different allocator.
|
||
|
|
/**
|
||
|
|
* Present only if @c ProtoAllocator is void.
|
||
|
|
*/
|
||
|
|
template <typename OtherAllocator>
|
||
|
|
allocator_t<OtherAllocator operator()(const OtherAllocator& a);
|
||
|
|
};
|
||
|
|
|
||
|
|
/// A special value used for accessing the allocator_t property.
|
||
|
|
constexpr allocator_t<void> allocator;
|
||
|
|
|
||
|
|
} // namespace execution
|
||
|
|
|
||
|
|
#else // defined(GENERATING_DOCUMENTATION)
|
||
|
|
|
||
|
|
namespace execution {
|
||
|
|
|
||
|
|
template <typename ProtoAllocator>
|
||
|
|
struct allocator_t
|
||
|
|
{
|
||
|
|
#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
||
|
|
# if defined(ASIO_NO_DEPRECATED)
|
||
|
|
template <typename T>
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool,
|
||
|
|
is_applicable_property_v = (
|
||
|
|
is_executor<T>::value));
|
||
|
|
# else // defined(ASIO_NO_DEPRECATED)
|
||
|
|
template <typename T>
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool,
|
||
|
|
is_applicable_property_v = (
|
||
|
|
is_executor<T>::value
|
||
|
|
|| conditional<
|
||
|
|
is_executor<T>::value,
|
||
|
|
false_type,
|
||
|
|
is_sender<T>
|
||
|
|
>::type::value
|
||
|
|
|| conditional<
|
||
|
|
is_executor<T>::value,
|
||
|
|
false_type,
|
||
|
|
is_scheduler<T>
|
||
|
|
>::type::value
|
||
|
|
));
|
||
|
|
# endif // defined(ASIO_NO_DEPRECATED)
|
||
|
|
#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool, is_preferable = true);
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct static_proxy
|
||
|
|
{
|
||
|
|
#if defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
|
||
|
|
struct type
|
||
|
|
{
|
||
|
|
template <typename P>
|
||
|
|
static constexpr auto query(ASIO_MOVE_ARG(P) p)
|
||
|
|
noexcept(
|
||
|
|
noexcept(
|
||
|
|
conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
|
||
|
|
)
|
||
|
|
)
|
||
|
|
-> decltype(
|
||
|
|
conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
|
||
|
|
)
|
||
|
|
{
|
||
|
|
return T::query(ASIO_MOVE_CAST(P)(p));
|
||
|
|
}
|
||
|
|
};
|
||
|
|
#else // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
|
||
|
|
typedef T type;
|
||
|
|
#endif // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
|
||
|
|
};
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct query_static_constexpr_member :
|
||
|
|
traits::query_static_constexpr_member<
|
||
|
|
typename static_proxy<T>::type, allocator_t> {};
|
||
|
|
|
||
|
|
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
|
||
|
|
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
template <typename T>
|
||
|
|
static ASIO_CONSTEXPR
|
||
|
|
typename query_static_constexpr_member<T>::result_type
|
||
|
|
static_query()
|
||
|
|
ASIO_NOEXCEPT_IF((
|
||
|
|
query_static_constexpr_member<T>::is_noexcept))
|
||
|
|
{
|
||
|
|
return query_static_constexpr_member<T>::value();
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename E, typename T = decltype(allocator_t::static_query<E>())>
|
||
|
|
static ASIO_CONSTEXPR const T static_query_v
|
||
|
|
= allocator_t::static_query<E>();
|
||
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
||
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
ASIO_CONSTEXPR ProtoAllocator value() const
|
||
|
|
{
|
||
|
|
return a_;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
friend struct allocator_t<void>;
|
||
|
|
|
||
|
|
explicit ASIO_CONSTEXPR allocator_t(const ProtoAllocator& a)
|
||
|
|
: a_(a)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
ProtoAllocator a_;
|
||
|
|
};
|
||
|
|
|
||
|
|
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
|
||
|
|
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
template <typename ProtoAllocator> template <typename E, typename T>
|
||
|
|
const T allocator_t<ProtoAllocator>::static_query_v;
|
||
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
||
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
template <>
|
||
|
|
struct allocator_t<void>
|
||
|
|
{
|
||
|
|
#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
||
|
|
# if defined(ASIO_NO_DEPRECATED)
|
||
|
|
template <typename T>
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool,
|
||
|
|
is_applicable_property_v = (
|
||
|
|
is_executor<T>::value));
|
||
|
|
# else // defined(ASIO_NO_DEPRECATED)
|
||
|
|
template <typename T>
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool,
|
||
|
|
is_applicable_property_v = (
|
||
|
|
is_executor<T>::value
|
||
|
|
|| conditional<
|
||
|
|
is_executor<T>::value,
|
||
|
|
false_type,
|
||
|
|
is_sender<T>
|
||
|
|
>::type::value
|
||
|
|
|| conditional<
|
||
|
|
is_executor<T>::value,
|
||
|
|
false_type,
|
||
|
|
is_scheduler<T>
|
||
|
|
>::type::value
|
||
|
|
));
|
||
|
|
# endif // defined(ASIO_NO_DEPRECATED)
|
||
|
|
#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool, is_preferable = true);
|
||
|
|
|
||
|
|
ASIO_CONSTEXPR allocator_t()
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct static_proxy
|
||
|
|
{
|
||
|
|
#if defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
|
||
|
|
struct type
|
||
|
|
{
|
||
|
|
template <typename P>
|
||
|
|
static constexpr auto query(ASIO_MOVE_ARG(P) p)
|
||
|
|
noexcept(
|
||
|
|
noexcept(
|
||
|
|
conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
|
||
|
|
)
|
||
|
|
)
|
||
|
|
-> decltype(
|
||
|
|
conditional<true, T, P>::type::query(ASIO_MOVE_CAST(P)(p))
|
||
|
|
)
|
||
|
|
{
|
||
|
|
return T::query(ASIO_MOVE_CAST(P)(p));
|
||
|
|
}
|
||
|
|
};
|
||
|
|
#else // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
|
||
|
|
typedef T type;
|
||
|
|
#endif // defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
|
||
|
|
};
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
struct query_static_constexpr_member :
|
||
|
|
traits::query_static_constexpr_member<
|
||
|
|
typename static_proxy<T>::type, allocator_t> {};
|
||
|
|
|
||
|
|
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
|
||
|
|
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
template <typename T>
|
||
|
|
static ASIO_CONSTEXPR
|
||
|
|
typename query_static_constexpr_member<T>::result_type
|
||
|
|
static_query()
|
||
|
|
ASIO_NOEXCEPT_IF((
|
||
|
|
query_static_constexpr_member<T>::is_noexcept))
|
||
|
|
{
|
||
|
|
return query_static_constexpr_member<T>::value();
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename E, typename T = decltype(allocator_t::static_query<E>())>
|
||
|
|
static ASIO_CONSTEXPR const T static_query_v
|
||
|
|
= allocator_t::static_query<E>();
|
||
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
||
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
template <typename OtherProtoAllocator>
|
||
|
|
ASIO_CONSTEXPR allocator_t<OtherProtoAllocator> operator()(
|
||
|
|
const OtherProtoAllocator& a) const
|
||
|
|
{
|
||
|
|
return allocator_t<OtherProtoAllocator>(a);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
|
||
|
|
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
template <typename E, typename T>
|
||
|
|
const T allocator_t<void>::static_query_v;
|
||
|
|
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
||
|
|
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
|
||
|
|
constexpr allocator_t<void> allocator;
|
||
|
|
#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
|
||
|
|
template <typename T>
|
||
|
|
struct allocator_instance
|
||
|
|
{
|
||
|
|
static allocator_t<T> instance;
|
||
|
|
};
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
allocator_t<T> allocator_instance<T>::instance;
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
static const allocator_t<void>& allocator = allocator_instance<void>::instance;
|
||
|
|
} // namespace
|
||
|
|
#endif
|
||
|
|
|
||
|
|
} // namespace execution
|
||
|
|
|
||
|
|
#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
template <typename T, typename ProtoAllocator>
|
||
|
|
struct is_applicable_property<T, execution::allocator_t<ProtoAllocator> >
|
||
|
|
: integral_constant<bool,
|
||
|
|
execution::is_executor<T>::value
|
||
|
|
#if !defined(ASIO_NO_DEPRECATED)
|
||
|
|
|| conditional<
|
||
|
|
execution::is_executor<T>::value,
|
||
|
|
false_type,
|
||
|
|
execution::is_sender<T>
|
||
|
|
>::type::value
|
||
|
|
|| conditional<
|
||
|
|
execution::is_executor<T>::value,
|
||
|
|
false_type,
|
||
|
|
execution::is_scheduler<T>
|
||
|
|
>::type::value
|
||
|
|
#endif // !defined(ASIO_NO_DEPRECATED)
|
||
|
|
>
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // !defined(ASIO_HAS_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
namespace traits {
|
||
|
|
|
||
|
|
#if !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
|
||
|
|
|| !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
template <typename T, typename ProtoAllocator>
|
||
|
|
struct static_query<T, execution::allocator_t<ProtoAllocator>,
|
||
|
|
typename enable_if<
|
||
|
|
execution::allocator_t<ProtoAllocator>::template
|
||
|
|
query_static_constexpr_member<T>::is_valid
|
||
|
|
>::type>
|
||
|
|
{
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
||
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
||
|
|
|
||
|
|
typedef typename execution::allocator_t<ProtoAllocator>::template
|
||
|
|
query_static_constexpr_member<T>::result_type result_type;
|
||
|
|
|
||
|
|
static ASIO_CONSTEXPR result_type value()
|
||
|
|
{
|
||
|
|
return execution::allocator_t<ProtoAllocator>::template
|
||
|
|
query_static_constexpr_member<T>::value();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
|
||
|
|
// || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
|
||
|
|
|
||
|
|
} // namespace traits
|
||
|
|
|
||
|
|
#endif // defined(GENERATING_DOCUMENTATION)
|
||
|
|
|
||
|
|
} // namespace asio
|
||
|
|
|
||
|
|
#include "asio/detail/pop_options.hpp"
|
||
|
|
|
||
|
|
#endif // ASIO_EXECUTION_ALLOCATOR_HPP
|