libstdc++-v3/testsuite/24_iterators/range_access_cpp17_neg.cc

   1 // Copyright (C) 2017 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++17" }
  19 // { dg-do compile { target c++17 } }
  20
  21 #include <iterator>
  22 #include <initializer_list>
  23
  24 void
  25 test01()
  26 {
  27   struct A { bool empty() const { return true; } };
  28   A a;
  29   std::empty(a);  // { dg-warning "ignoring return value" }
  30 }
  31
  32 void
  33 test02()
  34 {
  35   int a[2];
  36   std::empty(a);  // { dg-warning "ignoring return value" }
  37 }
  38
  39 void
  40 test03()
  41 {
  42   std::initializer_list<int> a{};
  43   std::empty(a);  // { dg-warning "ignoring return value" }
  44 }