1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkScopeExit_DEFINED 9 #define SkScopeExit_DEFINED 10 11 #include "SkTypes.h" 12 #include "SkMacros.h" 13 14 #include <functional> 15 16 /** SkScopeExit calls a std:::function<void()> in its destructor. */ 17 class SkScopeExit { 18 public: 19 SkScopeExit(std::function<void()> f) : fFn(std::move(f)) {} 20 SkScopeExit(SkScopeExit&& that) : fFn(std::move(that.fFn)) {} 21 22 ~SkScopeExit() { 23 if (fFn) { 24 fFn(); 25 } 26 } 27 28 void clear() { fFn = {}; } 29 30 SkScopeExit& operator=(SkScopeExit&& that) { 31 fFn = std::move(that.fFn); 32 return *this; 33 } 34 35 private: 36 std::function<void()> fFn; 37 38 SkScopeExit( const SkScopeExit& ) = delete; 39 SkScopeExit& operator=(const SkScopeExit& ) = delete; 40 }; 41 42 /** 43 * SK_AT_SCOPE_EXIT(stmt) evaluates stmt when the current scope ends. 44 * 45 * E.g. 46 * { 47 * int x = 5; 48 * { 49 * SK_AT_SCOPE_EXIT(x--); 50 * SkASSERT(x == 5); 51 * } 52 * SkASSERT(x == 4); 53 * } 54 */ 55 #define SK_AT_SCOPE_EXIT(stmt) \ 56 SkScopeExit SK_MACRO_APPEND_LINE(at_scope_exit_)([&]() { stmt; }) 57 58 #endif // SkScopeExit_DEFINED 59
