libcxx/test/std/thread/futures/futures.task/futures.task.members/ctor1.verify.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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // UNSUPPORTED: no-threads
  10 // UNSUPPORTED: c++03
  11
  12 // <future>
  13
  14 // class packaged_task<R(ArgTypes...)>
  15 // template <class F>
  16 //   packaged_task(F&& f);
  17 // These constructors shall not participate in overload resolution if
  18 //    decay<F>::type is the same type as std::packaged_task<R(ArgTypes...)>.
  19
  20 #include <future>
  21 #include <cassert>
  22
  23 struct A {};
  24 typedef std::packaged_task<A(int, char)> PT;
  25 typedef volatile std::packaged_task<A(int, char)> VPT;
  26
  27
  28 int main(int, char**)
  29 {
  30     VPT init{};
  31     auto const& c_init = init;
  32     PT p1{init}; // expected-error {{no matching constructor}}
  33     PT p2{c_init}; // expected-error {{no matching constructor}}
  34     PT p3{std::move(init)}; // expected-error {{no matching constructor for initialization of 'PT' (aka 'packaged_task<A (int, char)>')}}
  35
  36   return 0;
  37 }