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 // explicit operator bool() const 15 16 #include <functional> 17 #include <cassert> 18 19 int g(int) {return 0;} 20 21 int main() 22 { 23 { 24 std::function<int(int)> f; 25 assert(!f); 26 f = g; 27 assert(f); 28 } 29 } 30