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 // template <class F> 17 // explicit packaged_task(F&& f); 18 19 #include <future> 20 #include <cassert> 21 22 class A 23 { 24 long data_; 25 26 public: 27 static int n_moves; 28 static int n_copies; 29 30 explicit A(long i) : data_(i) {} 31 A(A&& a) : data_(a.data_) {++n_moves; a.data_ = -1;} 32 A(const A& a) : data_(a.data_) {++n_copies;} 33 34 long operator()(long i, long j) const {return data_ + i + j;} 35 }; 36 37 int A::n_moves = 0; 38 int A::n_copies = 0; 39 40 int func(int i) { return i; } 41 42 int main() 43 { 44 { 45 std::packaged_task<double(int, char)> p(A(5)); 46 assert(p.valid()); 47 std::future<double> f = p.get_future(); 48 p(3, 'a'); 49 assert(f.get() == 105.0); 50 assert(A::n_copies == 0); 51 assert(A::n_moves > 0); 52 } 53 A::n_copies = 0; 54 A::n_copies = 0; 55 { 56 A a(5); 57 std::packaged_task<double(int, char)> p(a); 58 assert(p.valid()); 59 std::future<double> f = p.get_future(); 60 p(3, 'a'); 61 assert(f.get() == 105.0); 62 assert(A::n_copies > 0); 63 assert(A::n_moves > 0); 64 } 65 { 66 std::packaged_task<int(int)> p(&func); 67 assert(p.valid()); 68 std::future<int> f = p.get_future(); 69 p(4); 70 assert(f.get() == 4); 71 } 72 { 73 std::packaged_task<int(int)> p(func); 74 assert(p.valid()); 75 std::future<int> f = p.get_future(); 76 p(4); 77 assert(f.get() == 4); 78 } 79 } 80
