libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/95578.cc

   1 // Copyright (C) 2020 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 <algorithm>
  22 #include <vector>
  23 #include <testsuite_hooks.h>
  24
  25 namespace ranges = std::ranges;
  26
  27 template<typename It>
  28 struct sentinel
  29 {
  30   It it;
  31
  32   friend bool
  33   operator==(It x, sentinel y)
  34   { return x == y.it; }
  35 };
  36
  37 void
  38 test01()
  39 {
  40   std::vector<int> v = {1,2,3,4,5};
  41   ranges::subrange sr = {v.begin(), sentinel{v.end()}};
  42   VERIFY( ranges::lexicographical_compare(sr, (int[]){1,2,3,5,5}) );
  43   VERIFY( !ranges::lexicographical_compare((int[]){1,2,3,5,5}, sr) );
  44 }
  45
  46 void
  47 test02()
  48 {
  49   using std::reverse_iterator;
  50   std::vector<int> v = {1,2,3,4,5};
  51   ranges::subrange sr
  52     = {reverse_iterator{v.end()}, sentinel{reverse_iterator{v.begin()}}};
  53   VERIFY( ranges::lexicographical_compare(sr, (int[]){5,4,3,2,2}) );
  54   VERIFY( !ranges::lexicographical_compare((int[]){5,4,3,2,2}, sr) );
  55 }
  56
  57 void
  58 test03()
  59 {
  60   using std::move_iterator;
  61   std::vector<int> v = {1,2,3,4,5};
  62   ranges::subrange sr
  63     = {move_iterator{v.begin()}, sentinel{move_iterator{v.end()}}};
  64   VERIFY( ranges::lexicographical_compare(sr, (int[]){1,2,3,5,5}) );
  65   VERIFY( !ranges::lexicographical_compare((int[]){1,2,3,5,5}, sr) );
  66 }
  67
  68 int
  69 main()
  70 {
  71   test01();
  72   test02();
  73   test03();
  74 }