nullptr_t_assign_reentrant.pass.cpp (941B)
1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <functional> 11 12 // class function<R(ArgTypes...)> 13 14 // function& operator=(nullptr_t); 15 16 #include <functional> 17 #include <cassert> 18 19 #include "test_macros.h" 20 21 struct A 22 { 23 static std::function<void()> global; 24 static bool cancel; 25 26 ~A() { 27 DoNotOptimize(cancel); 28 if (cancel) 29 global = nullptr; 30 } 31 void operator()() {} 32 }; 33 34 std::function<void()> A::global; 35 bool A::cancel = false; 36 37 int main() 38 { 39 A::global = A(); 40 assert(A::global.target<A>()); 41 42 // Check that we don't recurse in A::~A(). 43 A::cancel = true; 44 A::global = nullptr; 45 assert(!A::global.target<A>()); 46 }