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 // future<R> get_future(); 18 19 #include <future> 20 #include <cassert> 21 22 class A 23 { 24 long data_; 25 26 public: A(long i)27 explicit A(long i) : data_(i) {} 28 operator ()(long i,long j) const29 long operator()(long i, long j) const {return data_ + i + j;} 30 }; 31 main()32int main() 33 { 34 { 35 std::packaged_task<double(int, char)> p(A(5)); 36 std::future<double> f = p.get_future(); 37 p(3, 'a'); 38 assert(f.get() == 105.0); 39 } 40 { 41 std::packaged_task<double(int, char)> p(A(5)); 42 std::future<double> f = p.get_future(); 43 try 44 { 45 f = p.get_future(); 46 assert(false); 47 } 48 catch (const std::future_error& e) 49 { 50 assert(e.code() == make_error_code(std::future_errc::future_already_retrieved)); 51 } 52 } 53 { 54 std::packaged_task<double(int, char)> p; 55 try 56 { 57 std::future<double> f = p.get_future(); 58 assert(false); 59 } 60 catch (const std::future_error& e) 61 { 62 assert(e.code() == make_error_code(std::future_errc::no_state)); 63 } 64 } 65 } 66