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66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/*
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* \brief Compile-time-defined parent-service registry
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* \author Norman Feske
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* \date 2017-01-23
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*
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* Child-management utilities such as 'Slave::Policy' take a registry of
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* permitted parent services as construction argument. As a special form of
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* such a registry, a 'Static_parent_services' object is statically defined at
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* compile time instead of populated during runtime. It thereby allows the
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* creation of a parent-service registry without the need for dynamic memory
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* allocations if the types of the registered services are known at compile
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* time.
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__OS__STATIC_PARENT_SERVICES_H_
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#define _INCLUDE__OS__STATIC_PARENT_SERVICES_H_
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#include <base/registry.h>
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#include <base/service.h>
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namespace Genode { template <typename...> class Static_parent_services; }
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template <typename... SESSION_TYPES>
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class Genode::Static_parent_services : public Registry<Registered<Parent_service> >
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{
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private:
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template <typename...>
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struct Service_recursive;
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template <typename HEAD, typename... TAIL>
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struct Service_recursive<HEAD, TAIL...>
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{
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Registered<Parent_service> service;
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Service_recursive<TAIL...> tail;
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Service_recursive(Env &env, Registry<Registered<Parent_service> > ®istry)
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: service(registry, env, HEAD::service_name()), tail(env, registry) { }
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};
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template <typename LAST>
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struct Service_recursive<LAST>
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{
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Registered<Parent_service> service;
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Service_recursive(Env &env, Registry<Registered<Parent_service> > ®istry)
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: service(registry, env, LAST::service_name()) { }
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};
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Service_recursive<SESSION_TYPES...> _service_recursive;
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public:
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Static_parent_services(Env &env) : _service_recursive(env, *this) { }
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};
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#endif /* _INCLUDE__OS__STATIC_PARENT_SERVICES_H_ */
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