MovableOnScopeExit.hpp

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// @formatter:off
//
// Balau core C++ library
//
// Copyright (C) 2008 Bora Software (contact@borasoftware.com)
//
// Licensed under the Boost Software License - Version 1.0 - August 17th, 2003.
// See the LICENSE file for the full license text.
//


#ifndef COM_BORA_SOFTWARE__BALAU_TYPE__MOVEABLE_ON_SCOPE_EXIT
#define COM_BORA_SOFTWARE__BALAU_TYPE__MOVEABLE_ON_SCOPE_EXIT

#include <functional>
#include <memory>

namespace Balau {

class MovableOnScopeExit final {
    public: template <typename FunctionT> explicit MovableOnScopeExit(FunctionT function)
        : exiter(new ContainerImpl<FunctionT>(function)) {}

    public: MovableOnScopeExit(MovableOnScopeExit && rhs) noexcept
        : exiter(std::move(rhs.exiter)) {}

    public: void clear() {
        exiter->clear();
    }

    public: void executeNow() {
        exiter->executeNow();
    }


    public: MovableOnScopeExit(const MovableOnScopeExit &) = delete;
    public: MovableOnScopeExit & operator = (const MovableOnScopeExit &) = delete;

    private: struct ContainerBase {
        virtual ~ContainerBase() = default;
        public: virtual void clear() = 0;
        public: virtual void reset(std::function<void ()> function_) = 0;
        public: virtual void executeNow() = 0;
    };

    private: template <typename FunctionT> struct ContainerImpl : public ContainerBase {
        explicit ContainerImpl(FunctionT function_) : function(function_) {}

        ~ContainerImpl() override {
            function();
        }

        ContainerImpl(const ContainerImpl &) = delete;
        ContainerImpl & operator =(const ContainerImpl &) = delete;

        public: void clear() override {
            function = [] () {};
        }

        public: void executeNow() override {
            function();
            clear();
        }

        friend class MovableOnScopeExit;
        private: FunctionT function;
    };

    private: std::unique_ptr<ContainerBase> exiter;
};

} // namespace Balau

#endif // COM_BORA_SOFTWARE__BALAU_TYPE__MOVEABLE_ON_SCOPE_EXIT