//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // <functional> // class function<R(ArgTypes...)> // explicit operator bool() const #include <functional> #include <cassert> int g(int) {return 0;} int main() { { std::function<int(int)> f; assert(!f); f = g; assert(f); } }