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 // UNSUPPORTED: libcpp-has-no-threads 11 12 // <future> 13 14 // class packaged_task<R(ArgTypes...)> 15 16 // template <class R, class... ArgTypes> 17 // void 18 // swap(packaged_task<R(ArgTypes...)>& x, packaged_task<R(ArgTypes...)>& y); 19 20 #include <future> 21 #include <cassert> 22 23 class A 24 { 25 long data_; 26 27 public: 28 explicit A(long i) : data_(i) {} 29 30 long operator()(long i, long j) const {return data_ + i + j;} 31 }; 32 33 int main() 34 { 35 { 36 std::packaged_task<double(int, char)> p0(A(5)); 37 std::packaged_task<double(int, char)> p; 38 swap(p, p0); 39 assert(!p0.valid()); 40 assert(p.valid()); 41 std::future<double> f = p.get_future(); 42 p(3, 'a'); 43 assert(f.get() == 105.0); 44 } 45 { 46 std::packaged_task<double(int, char)> p0; 47 std::packaged_task<double(int, char)> p; 48 swap(p, p0); 49 assert(!p0.valid()); 50 assert(!p.valid()); 51 } 52 } 53
