text: //
  // detail/impl/service_registry.hpp
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2022 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_DETAIL_IMPL_SERVICE_REGISTRY_HPP
  #define BOOST_ASIO_DETAIL_IMPL_SERVICE_REGISTRY_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  namespace detail {
  
  template <typename Service>
  Service& service_registry::use_service()
  {
    execution_context::service::key key;
    init_key<Service>(key, 0);
    factory_type factory = &service_registry::create<Service, execution_context>;
    return *static_cast<Service*>(do_use_service(key, factory, &owner_));
  }
  
  template <typename Service>
  Service& service_registry::use_service(io_context& owner)
  {
    execution_context::service::key key;
    init_key<Service>(key, 0);
    factory_type factory = &service_registry::create<Service, io_context>;
    return *static_cast<Service*>(do_use_service(key, factory, &owner));
  }
  
  template <typename Service>
  void service_registry::add_service(Service* new_service)
  {
    execution_context::service::key key;
    init_key<Service>(key, 0);
    return do_add_service(key, new_service);
  }
  
  template <typename Service>
  bool service_registry::has_service() const
  {
    execution_context::service::key key;
    init_key<Service>(key, 0);
    return do_has_service(key);
  }
  
  template <typename Service>
  inline void service_registry::init_key(
      execution_context::service::key& key, ...)
  {
    init_key_from_id(key, Service::id);
  }
  
  #if !defined(BOOST_ASIO_NO_TYPEID)
  template <typename Service>
  void service_registry::init_key(execution_context::service::key& key,
      typename enable_if<
        is_base_of<typename Service::key_type, Service>::value>::type*)
  {
    key.type_info_ = &typeid(typeid_wrapper<Service>);
    key.id_ = 0;
  }
  
  template <typename Service>
  void service_registry::init_key_from_id(execution_context::service::key& key,
      const service_id<Service>& /*id*/)
  {
    key.type_info_ = &typeid(typeid_wrapper<Service>);
    key.id_ = 0;
  }
  #endif // !defined(BOOST_ASIO_NO_TYPEID)
  
  template <typename Service, typename Owner>
  execution_context::service* service_registry::create(void* owner)
  {
    return new Service(*static_cast<Owner*>(owner));
  }
  
  } // namespace detail
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // BOOST_ASIO_DETAIL_IMPL_SERVICE_REGISTRY_HPP
  