libstdc++-v3/testsuite/23_containers/list/operations/remove_cxx20_return.cc

   1 // Copyright (C) 2018-2023 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-do run { target c++20 } }
  19
  20 #include <list>
  21 #include <testsuite_hooks.h>
  22
  23 using test_type = std::list<int>;
  24
  25 void
  26 test01()
  27 {
  28   test_type x{1, 2, 3, 4, 3, 2, 1};
  29   static_assert(std::is_same_v<decltype(x.remove(0)), test_type::size_type>);
  30   test_type::size_type r = x.remove(0);
  31   VERIFY( r == 0 );
  32   r = x.remove(1);
  33   VERIFY( r == 2 );
  34   r = x.remove(1);
  35   VERIFY( r == 0 );
  36   r = x.remove(4);
  37   VERIFY( r == 1 );
  38 }
  39
  40 void
  41 test02()
  42 {
  43   int i = 0;
  44   auto pred = [&i](int val) { return val == i; };
  45   test_type x{1, 2, 3, 4, 3, 2, 1};
  46   static_assert(std::is_same_v<decltype(x.remove_if(pred)),
  47                                test_type::size_type>);
  48   test_type::size_type r = x.remove_if(pred);
  49   VERIFY( r == 0 );
  50   i = 1;
  51   r = x.remove_if(pred);
  52   VERIFY( r == 2 );
  53   r = x.remove_if(pred);
  54   VERIFY( r == 0 );
  55   i = 4;
  56   r = x.remove_if(pred);
  57   VERIFY( r == 1 );
  58 }
  59
  60 int
  61 main()
  62 {
  63   test01();
  64   test02();
  65 }