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+//
+// execution/allocator.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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/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.
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor_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)
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor<T>::value;
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ static constexpr bool is_requirable = true;
+ 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(P&& p)
+ noexcept(
+ noexcept(
+ conditional_t<true, T, P>::query(static_cast<P&&>(p))
+ )
+ )
+ -> decltype(
+ conditional_t<true, T, P>::query(static_cast<P&&>(p))
+ )
+ {
+ return T::query(static_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 constexpr typename query_static_constexpr_member<T>::result_type
+ static_query()
+ noexcept(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 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)
+
+ constexpr ProtoAllocator value() const
+ {
+ return a_;
+ }
+
+private:
+ friend struct allocator_t<void>;
+
+ explicit 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)
+ template <typename T>
+ static constexpr bool is_applicable_property_v = is_executor<T>::value;
+#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
+
+ static constexpr bool is_requirable = true;
+ static constexpr bool is_preferable = true;
+
+ 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(P&& p)
+ noexcept(
+ noexcept(
+ conditional_t<true, T, P>::query(static_cast<P&&>(p))
+ )
+ )
+ -> decltype(
+ conditional_t<true, T, P>::query(static_cast<P&&>(p))
+ )
+ {
+ return T::query(static_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 constexpr typename query_static_constexpr_member<T>::result_type
+ static_query()
+ noexcept(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 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>
+ 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)
+
+constexpr allocator_t<void> allocator;
+
+} // 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>
+{
+};
+
+#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>,
+ enable_if_t<
+ execution::allocator_t<ProtoAllocator>::template
+ query_static_constexpr_member<T>::is_valid
+ >>
+{
+ static constexpr bool is_valid = true;
+ static constexpr bool is_noexcept = true;
+
+ typedef typename execution::allocator_t<ProtoAllocator>::template
+ query_static_constexpr_member<T>::result_type result_type;
+
+ static 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