libstdc++-v3/testsuite/20_util/is_invocable/incomplete_neg.cc

   1 // { dg-do compile { target c++17 } }
   2
   3 // Copyright (C) 2020-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // { dg-error "must be a complete class" "" { target *-*-* } 0 }
  21
  22 #include <type_traits>
  23
  24 class X;
  25
  26 void test01()
  27 {
  28   std::is_invocable<X, int>();          // { dg-error "required from here" }
  29   std::is_invocable<X>();               // { dg-error "required from here" }
  30
  31   std::is_invocable_r<int, X, int>();           // { dg-error "required from here" }
  32   std::is_invocable_r<int, X>();                // { dg-error "required from here" }
  33
  34   std::is_invocable_r<X, X()>();                // { dg-error "required from here" }
  35   std::is_invocable_r<X, X(int), int>();                // { dg-error "required from here" }
  36   std::is_invocable_r<X, X(int, int), int, int>();              // { dg-error "required from here" }
  37
  38   std::is_invocable_r<X, X(), int, int>();              // { dg-error "required from here" }
  39 }