scope_exit.hpp

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#pragma once
 
#include <nui/utility/unique_identifier.hpp>
 
#include <functional>
#include <utility>
 
namespace Nui
{
    template <typename EF>
    class ScopeExit
    {
      public:
        ScopeExit(EF&& func)
            : onExit_(std::forward<EF>(func))
        {}
        ~ScopeExit()
        {
            onExit_();
        }
        void disarm()
        {
            onExit_ = [] {};
        }
 
      private:
        std::function<void()> onExit_;
    };
    template <typename T>
    ScopeExit(T) -> ScopeExit<T>;
 
    namespace Detail
    {
        struct MakeScopeExitImpl
        {
            template <typename FunctionT>
            auto operator->*(FunctionT&& fn) const
            {
                return ScopeExit<FunctionT>(std::forward<FunctionT>(fn));
            }
        };
    }
 
#define NUI_ON_SCOPE_EXIT auto NUI_UNIQUE_IDENTIFIER = ::Nui::Detail::MakeScopeExitImpl{}->*[&]
}