libcxx/test/std/utilities/utility/forward/forward.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 // test forward
  10
  11 #include <utility>
  12
  13 #include "test_macros.h"
  14
  15 struct A
  16 {
  17 };
  18
  19 A source() {return A();}
  20 const A csource() {return A();}
  21
  22 int main(int, char**)
  23 {
  24     {
  25         (void)std::forward<A&>(source());  // expected-note {{requested here}}
  26         // expected-error-re@*:* 1 {{static assertion failed{{.*}}cannot forward an rvalue as an lvalue}}
  27     }
  28     {
  29         const A ca = A();
  30         std::forward<A&>(ca); // expected-error {{no matching function for call to 'forward'}}
  31     }
  32     {
  33         std::forward<A&>(csource());  // expected-error {{no matching function for call to 'forward'}}
  34     }
  35     {
  36         const A ca = A();
  37         std::forward<A>(ca); // expected-error {{no matching function for call to 'forward'}}
  38     }
  39     {
  40         std::forward<A>(csource()); // expected-error {{no matching function for call to 'forward'}}
  41     }
  42     {
  43         A a;
  44         std::forward(a); // expected-error {{no matching function for call to 'forward'}}
  45     }
  46
  47   return 0;
  48 }