GenerateCompoundServer.h

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// Copyright 2015 Sensics, Inc.
//
// 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 INCLUDED_GenerateCompoundServer_h_GUID_55F870FA_C398_49B8_9907_A007B3C6F8CA
#define INCLUDED_GenerateCompoundServer_h_GUID_55F870FA_C398_49B8_9907_A007B3C6F8CA

// Internal Includes
#include "GenerateVrpnDynamicServer.h"

// Library/third-party includes
#include <boost/mpl/begin_end.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/next.hpp>
#include <boost/type_traits/is_same.hpp>

// Standard includes
// - none

namespace osvr {
namespace connection {
    namespace server_generation {

        template <typename Types> struct GenerateServer {

            template <typename Iter>
            struct IsLast
                : boost::is_same<typename boost::mpl::next<Iter>::type,
                                 typename boost::mpl::end<Types>::type> {};

            template <typename Iter = typename boost::mpl::begin<Types>::type,
                      bool Last = IsLast<Iter>::value>
            class ServerElement {};

            template <typename Iter> struct LeafBase {
                typedef typename boost::mpl::deref<Iter>::type type;
            };

            template <typename Iter> struct ChainBase {
                typedef ServerElement<typename boost::mpl::next<Iter>::type>
                    type;
            };

            template <typename Iter>
            class ServerElement<Iter, true> : public LeafBase<Iter>::type {
              public:
                typedef typename LeafBase<Iter>::type MyLeafBase;
                ServerElement(ConstructorArgument &init) : MyLeafBase(init) {}
                void mainloop() { MyLeafBase::server_mainloop(); }
                vrpn_Connection *connectionPtr() {
                    return MyLeafBase::connectionPtr();
                }
            };

            template <typename Iter>
            class ServerElement<Iter, false> : public LeafBase<Iter>::type,
                                               public ChainBase<Iter>::type {
              public:
                typedef typename LeafBase<Iter>::type MyLeafBase;
                typedef typename ChainBase<Iter>::type MyChainBase;

                ServerElement(ConstructorArgument &init)
                    : MyLeafBase(init), MyChainBase(init) {}

                void mainloop() { MyLeafBase::server_mainloop(); }

                vrpn_Connection *connectionPtr() {
                    return MyLeafBase::connectionPtr();
                }
            };

            typedef ServerElement<> type;

            static type *make(ConstructorArgument &init) {
                return new type(init);
            }
        };
    } // namespace server_generation
} // namespace connection
} // namespace osvr

#endif // INCLUDED_GenerateCompoundServer_h_GUID_55F870FA_C398_49B8_9907_A007B3C6F8CA