/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkScopeExit_DEFINED
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#define SkScopeExit_DEFINED
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#include "SkTypes.h"
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#include "SkMacros.h"
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#include <functional>
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/** SkScopeExit calls a std:::function<void()> in its destructor. */
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class SkScopeExit {
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public:
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SkScopeExit(std::function<void()> f) : fFn(std::move(f)) {}
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SkScopeExit(SkScopeExit&& that) : fFn(std::move(that.fFn)) {}
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~SkScopeExit() {
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if (fFn) {
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fFn();
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}
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}
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void clear() { fFn = {}; }
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SkScopeExit& operator=(SkScopeExit&& that) {
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fFn = std::move(that.fFn);
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return *this;
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}
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private:
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std::function<void()> fFn;
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SkScopeExit( const SkScopeExit& ) = delete;
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SkScopeExit& operator=(const SkScopeExit& ) = delete;
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};
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/**
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* SK_AT_SCOPE_EXIT(stmt) evaluates stmt when the current scope ends.
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*
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* E.g.
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* {
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* int x = 5;
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* {
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* SK_AT_SCOPE_EXIT(x--);
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* SkASSERT(x == 5);
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* }
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* SkASSERT(x == 4);
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* }
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*/
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#define SK_AT_SCOPE_EXIT(stmt) \
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SkScopeExit SK_MACRO_APPEND_LINE(at_scope_exit_)([&]() { stmt; })
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#endif // SkScopeExit_DEFINED
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