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#rb none #lockdown Nick.Penwarden #ROBOMERGE-OWNER: robert.manuszewski #ROBOMERGE-AUTHOR: jeanmichel.dignard #ROBOMERGE-SOURCE: CL 4784913 in //UE4/Main/... #ROBOMERGE-BOT: CORE (Main -> Dev-Core) [CL 4793830 by Robert Manuszewski in Dev-Core branch]
92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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/*
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Based on ScopeGuard presented at:
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http://channel9.msdn.com/Shows/Going+Deep/C-and-Beyond-2012-Andrei-Alexandrescu-Systematic-Error-Handling-in-C
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*/
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#pragma once
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#include "WebRTCProxyCommon.h"
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template<class Func>
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class TScopeGuard
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{
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public:
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TScopeGuard(Func F)
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: F(std::move(F))
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, Active(true)
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{
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}
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~TScopeGuard()
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{
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if (Active)
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F();
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}
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void Dismiss()
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{
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Active = false;
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}
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TScopeGuard() = delete;
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TScopeGuard(const TScopeGuard&) = delete;
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TScopeGuard& operator=(const TScopeGuard&) = delete;
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TScopeGuard(TScopeGuard&& Other)
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: F(std::move(Other.F))
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, Active(Other.Active)
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{
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Other.Dismiss();
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}
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private:
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Func F;
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bool Active;
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};
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/**
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Using a template function to create guards, to make for shorter code.
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e.g:
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auto g1 = ScopeGuard( [&] { SomeCleanupCode(); } );
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*/
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template< class Func>
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TScopeGuard<Func> ScopeGuard(Func F)
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{
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return TScopeGuard<Func>(std::move(F));
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}
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/**
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Macros to be able to set anonymous scope guards. E.g:
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// some code ...
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SCOPE_EXIT { some cleanup code };
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// more code ...
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SCOPE_EXIT { more cleanup code };
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// more code ...
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*/
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namespace detail
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{
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enum class EScopeGuardOnExit {};
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template <typename Func>
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__forceinline TScopeGuard<Func> operator+(EScopeGuardOnExit, Func&& F) {
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return TScopeGuard<Func>(std::forward<Func>(F));
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}
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}
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#define CONCATENATE_IMPL(S1,S2) S1##S2
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#define CONCATENATE(S1,S2) CONCATENATE_IMPL(S1,S2)
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// Note: __COUNTER__ Expands to an integer starting with 0 and incrementing by 1 every time it is used in a source file or included headers of the source file.
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#ifdef __COUNTER__
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#define ANONYMOUS_VARIABLE_BypassRedefinition(Str) \
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CONCATENATE(Str,__COUNTER__)
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#else
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#define ANONYMOUS_VARIABLE(Str) \
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CONCATENATE(Str,__LINE__)
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#endif
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#define SCOPE_EXIT \
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auto ANONYMOUS_VARIABLE_BypassRedefinition(SCOPE_EXIT_STATE) \
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= ::detail::EScopeGuardOnExit() + [&]()
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