reset.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// UNSUPPORTED: c++03
// <future>
// class packaged_task<R(ArgTypes...)>
// void reset();
#include <future>
#include <cassert>
#include "test_macros.h"
class A
{
long data_;
public:
explicit A(long i) : data_(i) {}
long operator()(long i, long j) const
{
return data_ + i + j;
}
};
int main(int, char**)
{
{
std::packaged_task<double(int, char)> p(A(5));
std::future<double> f = p.get_future();
p(3, 'a');
assert(f.get() == 105.0);
p.reset();
p(4, 'a');
f = p.get_future();
assert(f.get() == 106.0);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
std::packaged_task<double(int, char)> p;
try
{
p.reset();
assert(false);
}
catch (const std::future_error& e)
{
assert(e.code() == make_error_code(std::future_errc::no_state));
}
}
#endif
return 0;
}