swap.pass.cpp (1291B)
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 // UNSUPPORTED: c++98, c++03 12 13 // <future> 14 15 // class packaged_task<R(ArgTypes...)> 16 17 // template <class R, class... ArgTypes> 18 // void 19 // swap(packaged_task<R(ArgTypes...)>& x, packaged_task<R(ArgTypes...)>& y); 20 21 #include <future> 22 #include <cassert> 23 24 class A 25 { 26 long data_; 27 28 public: 29 explicit A(long i) : data_(i) {} 30 31 long operator()(long i, long j) const {return data_ + i + j;} 32 }; 33 34 int main() 35 { 36 { 37 std::packaged_task<double(int, char)> p0(A(5)); 38 std::packaged_task<double(int, char)> p; 39 swap(p, p0); 40 assert(!p0.valid()); 41 assert(p.valid()); 42 std::future<double> f = p.get_future(); 43 p(3, 'a'); 44 assert(f.get() == 105.0); 45 } 46 { 47 std::packaged_task<double(int, char)> p0; 48 std::packaged_task<double(int, char)> p; 49 swap(p, p0); 50 assert(!p0.valid()); 51 assert(!p.valid()); 52 } 53 }