40 lines
769 B
C++
40 lines
769 B
C++
/*
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* Copyright 2020 Axel Waggershauser
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*/
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include <utility>
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namespace ZXing {
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/**
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* ScopeExit is a trivial helper meant to be later replaced by std::scope_exit from library fundamentals TS v3.
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*/
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template <typename EF>
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class ScopeExit
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{
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EF fn;
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public:
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ScopeExit(EF&& fn) : fn(std::move(fn)) {}
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~ScopeExit() { fn(); }
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};
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template <class EF>
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ScopeExit(EF) -> ScopeExit<EF>;
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/**
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* The SCOPE_EXIT macro is eliminating the need to give the object a name.
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* Example usage:
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* SCOPE_EXIT([]{ printf("exiting scope"); });
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*/
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#define SCOPE_EXIT_CAT2(x, y) x##y
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#define SCOPE_EXIT_CAT(x, y) SCOPE_EXIT_CAT2(x, y)
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#define SCOPE_EXIT const auto SCOPE_EXIT_CAT(scopeExit_, __COUNTER__) = ScopeExit
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} // ZXing
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