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 <functional> 13 14 /** SkScopeExit calls a std:::function<void()> in its destructor. */ 15 class SkScopeExit { 16 public: 17 SkScopeExit(std::function<void()> f) : fFn(std::move(f)) {} 18 SkScopeExit(SkScopeExit&& that) : fFn(std::move(that.fFn)) {} 19 20 ~SkScopeExit() { 21 if (fFn) { 22 fFn(); 23 } 24 } 25 26 SkScopeExit& operator=(SkScopeExit&& that) { 27 fFn = std::move(that.fFn); 28 return *this; 29 } 30 31 private: 32 std::function<void()> fFn; 33 34 SkScopeExit( const SkScopeExit& ) = delete; 35 SkScopeExit& operator=(const SkScopeExit& ) = delete; 36 }; 37 38 /** 39 * SK_AT_SCOPE_EXIT(stmt) evaluates stmt when the current scope ends. 40 * 41 * E.g. 42 * { 43 * int x = 5; 44 * { 45 * SK_AT_SCOPE_EXIT(x--); 46 * SkASSERT(x == 5); 47 * } 48 * SkASSERT(x == 4); 49 * } 50 */ 51 #define SK_AT_SCOPE_EXIT(stmt) \ 52 SkScopeExit SK_MACRO_APPEND_LINE(at_scope_exit_)([&]() { stmt; }) 53 54 #endif // SkScopeExit_DEFINED 55
