libstdc++-v3/testsuite/23_containers/forward_list/operations/unique_cxx20_return.cc

   1 // Copyright (C) 2018-2019 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++2a" }
  19 // { dg-do run { target c++2a } }
  20
  21 #include <forward_list>
  22 #include <testsuite_hooks.h>
  23
  24 using test_type = std::forward_list<int>;
  25
  26 void
  27 test01()
  28 {
  29   test_type x{1, 2, 2, 4, 4, 2, 1};
  30   static_assert(std::is_same_v<decltype(x.unique()), test_type::size_type>);
  31   test_type::size_type r = x.unique();
  32   VERIFY( r == 2 );
  33   r = x.unique();
  34   VERIFY( r == 0 );
  35 }
  36
  37 void
  38 test02()
  39 {
  40   auto pred = [](int val, int prev) { return val == prev; };
  41   test_type x{1, 2, 2, 4, 4, 2, 1};
  42   static_assert(std::is_same_v<decltype(x.unique(pred)),
  43                                test_type::size_type>);
  44   test_type::size_type r = x.unique(pred);
  45   VERIFY( r == 2 );
  46   r = x.unique(pred);
  47   VERIFY( r == 0 );
  48 }
  49
  50 int
  51 main()
  52 {
  53   test01();
  54   test02();
  55 }