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 // <future> 11 12 // class packaged_task<R(ArgTypes...)> 13 14 // future<R> get_future(); 15 16 #include <future> 17 #include <cassert> 18 19 class A 20 { 21 long data_; 22 23 public: 24 explicit A(long i) : data_(i) {} 25 26 long operator()(long i, long j) const {return data_ + i + j;} 27 }; 28 29 int main() 30 { 31 { 32 std::packaged_task<double(int, char)> p(A(5)); 33 std::future<double> f = p.get_future(); 34 p(3, 'a'); 35 assert(f.get() == 105.0); 36 } 37 { 38 std::packaged_task<double(int, char)> p(A(5)); 39 std::future<double> f = p.get_future(); 40 try 41 { 42 f = p.get_future(); 43 assert(false); 44 } 45 catch (const std::future_error& e) 46 { 47 assert(e.code() == make_error_code(std::future_errc::future_already_retrieved)); 48 } 49 } 50 { 51 std::packaged_task<double(int, char)> p; 52 try 53 { 54 std::future<double> f = p.get_future(); 55 assert(false); 56 } 57 catch (const std::future_error& e) 58 { 59 assert(e.code() == make_error_code(std::future_errc::no_state)); 60 } 61 } 62 } 63
