InterfaceCallbacks.h

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// Copyright 2014 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_InterfaceCallbacks_h_GUID_0CE1EE79_D74A_4EAA_CF16_3AABDA3A1B6A
#define INCLUDED_InterfaceCallbacks_h_GUID_0CE1EE79_D74A_4EAA_CF16_3AABDA3A1B6A

// Internal Includes
#include <osvr/Common/ReportTypes.h>
#include <osvr/Common/ReportFromCallback.h>
#include <osvr/Util/TimeValue.h>

// Library/third-party includes
#include <osvr/TypePack/TypeKeyedTuple.h>
#include <osvr/TypePack/Quote.h>

// Standard includes
#include <vector>
#include <functional>

namespace osvr {
namespace common {
    struct CallbackStorage {
        template <typename ReportType>
        using apply = std::vector<
            std::function<void(const OSVR_TimeValue *, const ReportType *)>>;
    };

    using CallbackTuple =
        typepack::TypeKeyedTuple<traits::ReportTypeList, CallbackStorage>;
    class InterfaceCallbacks {
      public:
        template <typename CallbackType>
        void addCallback(CallbackType cb, void *userdata) {
            using ReportType = traits::ReportFromCallback_t<CallbackType>;
            typepack::get<ReportType>(m_callbacks)
                .push_back(
                    [cb, userdata](util::time::TimeValue const *timestamp,
                                   ReportType const *report) {
                        cb(userdata, timestamp, report);
                    });
        }

        template <typename ReportType>
        void triggerCallbacks(util::time::TimeValue const &timestamp,
                              ReportType const &report) const {
            for (auto const &f : typepack::cget<ReportType>(m_callbacks)) {
                f(&timestamp, &report);
            }
        }

        template <typename ReportType>
        std::size_t getNumCallbacksFor(ReportType const &) const {
            return typepack::cget<ReportType>(m_callbacks).size();
        }

      private:
        CallbackTuple m_callbacks;
    };

} // namespace common
} // namespace osvr

#endif // INCLUDED_InterfaceCallbacks_h_GUID_0CE1EE79_D74A_4EAA_CF16_3AABDA3A1B6A