/usr/include/asio/detail/service_registry.hpp is in libasio-dev 1:1.10.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// detail/service_registry.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2016 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/io_service.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename T>
class typeid_wrapper {};
class service_registry
: private noncopyable
{
public:
// Constructor. Adds the initial service.
template <typename Service, typename Arg>
service_registry(asio::io_service& o,
Service* initial_service, Arg arg);
// Destructor.
ASIO_DECL ~service_registry();
// Notify all services of a fork event.
ASIO_DECL void notify_fork(asio::io_service::fork_event fork_ev);
// Get the first service object cast to the specified type. Called during
// io_service construction and so performs no locking or type checking.
template <typename Service>
Service& first_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.
template <typename Service>
Service& use_service();
// 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:
// Initialise a service's key based on its id.
ASIO_DECL static void init_key(
asio::io_service::service::key& key,
const asio::io_service::id& id);
#if !defined(ASIO_NO_TYPEID)
// Initialise a service's key based on its id.
template <typename Service>
static void init_key(asio::io_service::service::key& key,
const asio::detail::service_id<Service>& /*id*/);
#endif // !defined(ASIO_NO_TYPEID)
// Check if a service matches the given id.
ASIO_DECL static bool keys_match(
const asio::io_service::service::key& key1,
const asio::io_service::service::key& key2);
// The type of a factory function used for creating a service instance.
typedef asio::io_service::service*
(*factory_type)(asio::io_service&);
// Factory function for creating a service instance.
template <typename Service>
static asio::io_service::service* create(
asio::io_service& owner);
// Destroy a service instance.
ASIO_DECL static void destroy(
asio::io_service::service* service);
// Helper class to manage service pointers.
struct auto_service_ptr;
friend struct auto_service_ptr;
struct auto_service_ptr
{
asio::io_service::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 asio::io_service::service* do_use_service(
const asio::io_service::service::key& key,
factory_type factory);
// 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 asio::io_service::service::key& key,
asio::io_service::service* new_service);
// Check whether a service object with the specified key already exists.
ASIO_DECL bool do_has_service(
const asio::io_service::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.
asio::io_service& owner_;
// The first service in the list of contained services.
asio::io_service::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
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