71 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// UNSUPPORTED: no-threads10// UNSUPPORTED: c++0311 12// <future>13 14// class packaged_task<R(ArgTypes...)>15 16// future<R> get_future();17 18#include <future>19#include <cassert>20 21#include "test_macros.h"22 23class A24{25 long data_;26 27public:28 explicit A(long i) : data_(i) {}29 30 long operator()(long i, long j) const {return data_ + i + j;}31};32 33int main(int, char**)34{35 {36 std::packaged_task<double(int, char)> p(A(5));37 std::future<double> f = p.get_future();38 p(3, 97);39 assert(f.get() == 105.0);40 }41#ifndef TEST_HAS_NO_EXCEPTIONS42 {43 std::packaged_task<double(int, char)> p(A(5));44 std::future<double> f = p.get_future();45 try46 {47 f = p.get_future();48 assert(false);49 }50 catch (const std::future_error& e)51 {52 assert(e.code() == make_error_code(std::future_errc::future_already_retrieved));53 }54 }55 {56 std::packaged_task<double(int, char)> p;57 try58 {59 std::future<double> f = p.get_future();60 assert(false);61 }62 catch (const std::future_error& e)63 {64 assert(e.code() == make_error_code(std::future_errc::no_state));65 }66 }67#endif68 69 return 0;70}71