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 IGNITION_COMMON_SPECIALIZEDPLUGIN_HH_
#define IGNITION_COMMON_SPECIALIZEDPLUGIN_HH_

#include <memory>

#include "ignition/common/Plugin.hh"

namespace ignition
{
  namespace common
  {
    // Forward declarations
    namespace detail { template <class, class> class ComposePlugin; }
    struct PluginInfo;

    // 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 TemplatePluginPtr;

      private: SpecializedPlugin();

      private: template <class T> struct type { };

      private: template <class Interface>
               Interface *PrivateQueryInterface(type<Interface> _type);

      private: SpecInterface *PrivateQueryInterface(
          type<SpecInterface> _type);

      private: template <class Interface>
               const Interface *PrivateQueryInterface(type<Interface> _type)
               const;

      private: const SpecInterface *PrivateQueryInterface(
                   type<SpecInterface> _type) const;

      private: template <class Interface>
               bool PrivateHasInterface(type<Interface> _type) const;

      private: bool PrivateHasInterface(type<SpecInterface> _type) const;

      private: const Plugin::InterfaceMap::iterator
               privateSpecializedInterfaceIterator;

      // 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.
    };
  }
}

#include "ignition/common/detail/SpecializedPlugin.hh"

#endif