1 //===- llvm/ADT/ScopeExit.h - Execute code at scope exit --------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines the make_scope_exit function, which executes user-defined 11 // cleanup logic at scope exit. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_ADT_SCOPE_EXIT_H 16 #define LLVM_ADT_SCOPE_EXIT_H 17 18 #include "llvm/Support/Compiler.h" 19 20 #include <type_traits> 21 #include <utility> 22 23 namespace llvm { 24 namespace detail { 25 26 template <typename Callable> class scope_exit { 27 Callable ExitFunction; 28 29 public: 30 template <typename Fp> 31 explicit scope_exit(Fp &&F) : ExitFunction(std::forward<Fp>(F)) {} 32 33 scope_exit(scope_exit &&Rhs) : ExitFunction(std::move(Rhs.ExitFunction)) {} 34 35 ~scope_exit() { ExitFunction(); } 36 }; 37 38 } // end namespace detail 39 40 // Keeps the callable object that is passed in, and execute it at the 41 // destruction of the returned object (usually at the scope exit where the 42 // returned object is kept). 43 // 44 // Interface is specified by p0052r2. 45 template <typename Callable> 46 LLVM_NODISCARD detail::scope_exit<typename std::decay<Callable>::type> 47 make_scope_exit(Callable &&F) { 48 return detail::scope_exit<typename std::decay<Callable>::type>( 49 std::forward<Callable>(F)); 50 } 51 52 } // end namespace llvm 53 54 #endif 55
