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+//
+// detail/service_registry.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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_DETAIL_SERVICE_REGISTRY_HPP
+#define ASIO_DETAIL_SERVICE_REGISTRY_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <typeinfo>
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/execution_context.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+class io_context;
+
+namespace detail {
+
+template <typename T>
+class typeid_wrapper {};
+
+class service_registry
+ : private noncopyable
+{
+public:
+ // Constructor.
+ ASIO_DECL service_registry(execution_context& owner);
+
+ // Destructor.
+ ASIO_DECL ~service_registry();
+
+ // Shutdown all services.
+ ASIO_DECL void shutdown_services();
+
+ // Destroy all services.
+ ASIO_DECL void destroy_services();
+
+ // Notify all services of a fork event.
+ ASIO_DECL void notify_fork(execution_context::fork_event fork_ev);
+
+ // Get the service object corresponding to the specified service type. Will
+ // create a new service object automatically if no such object already
+ // exists. Ownership of the service object is not transferred to the caller.
+ template <typename Service>
+ Service& use_service();
+
+ // Get the service object corresponding to the specified service type. Will
+ // create a new service object automatically if no such object already
+ // exists. Ownership of the service object is not transferred to the caller.
+ // This overload is used for backwards compatibility with services that
+ // inherit from io_context::service.
+ template <typename Service>
+ Service& use_service(io_context& owner);
+
+ // Add a service object. Throws on error, in which case ownership of the
+ // object is retained by the caller.
+ template <typename Service>
+ void add_service(Service* new_service);
+
+ // Check whether a service object of the specified type already exists.
+ template <typename Service>
+ bool has_service() const;
+
+private:
+ // Initalise a service's key when the key_type typedef is not available.
+ template <typename Service>
+ static void init_key(execution_context::service::key& key, ...);
+
+#if !defined(ASIO_NO_TYPEID)
+ // Initalise a service's key when the key_type typedef is available.
+ template <typename Service>
+ static void init_key(execution_context::service::key& key,
+ typename enable_if<
+ is_base_of<typename Service::key_type, Service>::value>::type*);
+#endif // !defined(ASIO_NO_TYPEID)
+
+ // Initialise a service's key based on its id.
+ ASIO_DECL static void init_key_from_id(
+ execution_context::service::key& key,
+ const execution_context::id& id);
+
+#if !defined(ASIO_NO_TYPEID)
+ // Initialise a service's key based on its id.
+ template <typename Service>
+ static void init_key_from_id(execution_context::service::key& key,
+ const service_id<Service>& /*id*/);
+#endif // !defined(ASIO_NO_TYPEID)
+
+ // Check if a service matches the given id.
+ ASIO_DECL static bool keys_match(
+ const execution_context::service::key& key1,
+ const execution_context::service::key& key2);
+
+ // The type of a factory function used for creating a service instance.
+ typedef execution_context::service*(*factory_type)(void*);
+
+ // Factory function for creating a service instance.
+ template <typename Service, typename Owner>
+ static execution_context::service* create(void* owner);
+
+ // Destroy a service instance.
+ ASIO_DECL static void destroy(execution_context::service* service);
+
+ // Helper class to manage service pointers.
+ struct auto_service_ptr;
+ friend struct auto_service_ptr;
+ struct auto_service_ptr
+ {
+ execution_context::service* ptr_;
+ ~auto_service_ptr() { destroy(ptr_); }
+ };
+
+ // Get the service object corresponding to the specified service key. Will
+ // create a new service object automatically if no such object already
+ // exists. Ownership of the service object is not transferred to the caller.
+ ASIO_DECL execution_context::service* do_use_service(
+ const execution_context::service::key& key,
+ factory_type factory, void* owner);
+
+ // Add a service object. Throws on error, in which case ownership of the
+ // object is retained by the caller.
+ ASIO_DECL void do_add_service(
+ const execution_context::service::key& key,
+ execution_context::service* new_service);
+
+ // Check whether a service object with the specified key already exists.
+ ASIO_DECL bool do_has_service(
+ const execution_context::service::key& key) const;
+
+ // Mutex to protect access to internal data.
+ mutable asio::detail::mutex mutex_;
+
+ // The owner of this service registry and the services it contains.
+ execution_context& owner_;
+
+ // The first service in the list of contained services.
+ execution_context::service* first_service_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/detail/impl/service_registry.hpp"
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/service_registry.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_DETAIL_SERVICE_REGISTRY_HPP