libstdc++-v3/testsuite/23_containers/map/operations/contains.cc

   1 // Copyright (C) 2018-2024 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 <map>
  21 #include <testsuite_hooks.h>
  22
  23 void
  24 test01()
  25 {
  26   std::map<int, void*> m;
  27   VERIFY( ! m.contains( 0 ) );
  28   VERIFY( ! m.contains( 1 ) );
  29   m[0] = nullptr;
  30   VERIFY( m.contains( 0 ) );
  31   VERIFY( ! m.contains( 1 ) );
  32   m[1] = nullptr;
  33   VERIFY( m.contains( 0 ) );
  34   VERIFY( m.contains( 1 ) );
  35 }
  36
  37 struct Zero { };
  38 bool operator<(Zero, int i) { return 0 < i; }
  39 bool operator<(int i, Zero) { return i < 0; }
  40
  41 struct One { };
  42 bool operator<(One, int i) { return 1 < i; }
  43 bool operator<(int i, One) { return i < 1; }
  44
  45 void
  46 test02()
  47 {
  48   std::map<int, void*, std::less<>> m;
  49   VERIFY( ! m.contains( Zero{} ) );
  50   VERIFY( ! m.contains( One{} ) );
  51   m[0] = nullptr;
  52   VERIFY( m.contains( Zero{} ) );
  53   VERIFY( ! m.contains( One{} ) );
  54   m[1] = nullptr;
  55   VERIFY( m.contains( Zero{} ) );
  56   VERIFY( m.contains( One{} ) );
  57 }
  58
  59 int
  60 main()
  61 {
  62   test01();
  63   test02();
  64 }