ScopeExit.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
namespace ScopeExitSupport
{
    template <typename FuncType>
    class TScopeGuard
    {
        TScopeGuard(TScopeGuard&&) = delete;
        TScopeGuard(const TScopeGuard&) = delete;
        TScopeGuard& operator=(TScopeGuard&&) = delete;
        TScopeGuard& operator=(const TScopeGuard&) = delete;
 
    public:
        // Given a lambda, constructs an RAII scope guard.
        explicit TScopeGuard(FuncType&& InFunc)
            : Func((FuncType&&)InFunc)
        {
        }
 
        // Causes the lambda to be executed.
        ~TScopeGuard()
        {
            Func();
        }
 
    private:
        // The lambda to be executed when this guard goes out of scope.
        FuncType Func;
    };
 
    struct FScopeGuardSyntaxSupport
    {
        template <typename FuncType>
        TScopeGuard<FuncType> operator+(FuncType&& InFunc)
        {
            return TScopeGuard<FuncType>((FuncType&&)InFunc);
        }
    };
}
 
#define UE_PRIVATE_SCOPE_EXIT_JOIN(A, B) UE_PRIVATE_SCOPE_EXIT_JOIN_INNER(A, B)
#define UE_PRIVATE_SCOPE_EXIT_JOIN_INNER(A, B) A##B
 
 
 
#define ON_SCOPE_EXIT const auto UE_PRIVATE_SCOPE_EXIT_JOIN(ScopeGuard_, __LINE__) = ::ScopeExitSupport::FScopeGuardSyntaxSupport() + [&]()