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 // future<R> get_future(); 17 18 #include <future> 19 #include <cassert> 20 21 class A 22 { 23 long data_; 24 25 public: 26 explicit A(long i) : data_(i) {} 27 28 long operator()(long i, long j) const {return data_ + i + j;} 29 }; 30 31 int main() 32 { 33 { 34 std::packaged_task<double(int, char)> p(A(5)); 35 std::future<double> f = p.get_future(); 36 p(3, 'a'); 37 assert(f.get() == 105.0); 38 } 39 { 40 std::packaged_task<double(int, char)> p(A(5)); 41 std::future<double> f = p.get_future(); 42 try 43 { 44 f = p.get_future(); 45 assert(false); 46 } 47 catch (const std::future_error& e) 48 { 49 assert(e.code() == make_error_code(std::future_errc::future_already_retrieved)); 50 } 51 } 52 { 53 std::packaged_task<double(int, char)> p; 54 try 55 { 56 std::future<double> f = p.get_future(); 57 assert(false); 58 } 59 catch (const std::future_error& e) 60 { 61 assert(e.code() == make_error_code(std::future_errc::no_state)); 62 } 63 } 64 } 65
