llvm/libcxx/test/std/thread/futures/futures.task/futures.task.members/ctor1.verify.cpp

//===----------------------------------------------------------------------===//
//
// 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: no-threads
// UNSUPPORTED: c++03

// <future>

// class packaged_task<R(ArgTypes...)>
// template <class F>
//   packaged_task(F&& f);
// These constructors shall not participate in overload resolution if
//    decay<F>::type is the same type as std::packaged_task<R(ArgTypes...)>.

#include <future>
#include <cassert>

struct A {};
typedef std::packaged_task<A(int, char)> PT;
typedef volatile std::packaged_task<A(int, char)> VPT;


int main(int, char**)
{
    VPT init{};
    auto const& c_init = init;
    PT p1{init}; // expected-error {{no matching constructor}}
    PT p2{c_init}; // expected-error {{no matching constructor}}
    PT p3{std::move(init)}; // expected-error {{no matching constructor for initialization of 'PT' (aka 'packaged_task<A (int, char)>')}}

  return 0;
}