gz/plugin/SpecializedPlugin.hh

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/*
 * Copyright (C) 2017 Open Source Robotics Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
 
 
#ifndef GZ_PLUGIN_SPECIALIZEDPLUGIN_HH_
#define GZ_PLUGIN_SPECIALIZEDPLUGIN_HH_
 
#include <memory>
#include "gz/plugin/Plugin.hh"
 
namespace gz
{
  namespace plugin
  {
    // Forward declarations
    namespace detail {
      template <class, class> class ComposePlugin;
      template <class> class SelectSpecializers;
    }
 
    // Forward declaration of the variadic template SpecializedPlugin class.
    template <class... OtherSpecInterfaces>
    class SpecializedPlugin;
 
    template <class SpecInterface>
    class SpecializedPlugin<SpecInterface> : public virtual Plugin
    {
      // -------------------- Public API ---------------------
 
      // Inherit function overloads
      public: using Plugin::QueryInterface;
      public: using Plugin::QueryInterfaceSharedPtr;
      public: using Plugin::HasInterface;
 
      // Documentation inherited
      public: template <class Interface>
              Interface *QueryInterface();
 
      // Documentation inherited
      public: template <class Interface>
              const Interface *QueryInterface() const;
 
      // Documentation inherited
      public: template <class Interface>
              std::shared_ptr<Interface> QueryInterfaceSharedPtr();
 
      // Documentation inherited
      public: template <class Interface>
              std::shared_ptr<const Interface> QueryInterfaceSharedPtr() const;
 
      // Documentation inherited
      public: template <class Interface>
              bool HasInterface() const;
 
 
      // -------------------- Private API ---------------------
 
      // Declare friendship
      template <class...> friend class SpecializedPlugin;
      template <class, class> friend class detail::ComposePlugin;
      template <class> friend class detail::SelectSpecializers;
      template <class> friend class TemplatePluginPtr;
 
      private: template <class T> struct type { };
 
      private: template <class Interface>
               Interface *PrivateQueryInterface(type<Interface>);
 
      private: SpecInterface *PrivateQueryInterface(type<SpecInterface>);
 
      private: template <class Interface>
               const Interface *PrivateQueryInterface(type<Interface>) const;
 
      private: const SpecInterface *PrivateQueryInterface(
                   type<SpecInterface>) const;
 
      private: template <class Interface>
               bool PrivateHasInterface(type<Interface>) const;
 
      private: bool PrivateHasInterface(type<SpecInterface>) const;
 
      // Dev note (MXG): The privateSpecializedInterfaceIterator object must be
      // available to the user during their compile time, so it cannot be hidden
      // using PIMPL. The iterator is const because it must always point to the
      // same entry throughout its entire lifecycle.
      private:
      const Plugin::InterfaceMap::iterator privateSpecializedInterfaceIterator;
 
      protected: SpecializedPlugin();
    };
  }
}
 
#include "gz/plugin/detail/SpecializedPlugin.hh"
 
#endif