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 24class A 25{ 26 long data_; 27 28public: 29 explicit A(long i) : data_(i) {} 30 31 long operator()(long i, long j) const {return data_ + i + j;} 32}; 33 34int 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} 54