Finally.h

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// Copyright 2016 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_Finally_h_GUID_B9F9A283_5381_41A5_3D60_CEF0F8BA8606
#define INCLUDED_Finally_h_GUID_B9F9A283_5381_41A5_3D60_CEF0F8BA8606

// Internal Includes
// - none

// Library/third-party includes
// - none

// Standard includes
#include <utility>

namespace osvr {
namespace util {
    template <typename F> class FinalTask {
      public:
        explicit FinalTask(F f) : f_(std::move(f)) {}
        FinalTask(FinalTask &&other) : f_(std::move(other.f_)), do_(other.do_) {
            other.cancel();
        }
        FinalTask(FinalTask const &) = delete;
        FinalTask &operator=(FinalTask const &) = delete;
        ~FinalTask() {
            if (do_) {
                f_();
            }
        }
        void cancel() { do_ = false; }

      private:
        F f_;
        bool do_ = true;
    };

    template <typename F> inline FinalTask<F> finally(F &&f) {
        return FinalTask<F>(std::forward<F>(f));
    }

    template <typename F> inline FinalTask<F> finally(F const &f) {
        // Added this overload because GSL had it and GSL is supposed to be best
        // practices guidelines...
        return FinalTask<F>(f);
    }

} // namespace util
} // namespace osvr

#endif // INCLUDED_Finally_h_GUID_B9F9A283_5381_41A5_3D60_CEF0F8BA8606