libstdc++-v3/testsuite/25_algorithms/is_sorted/constrained.cc

   1 // Copyright (C) 2020-2022 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 <testsuite_hooks.h>
  23 #include <testsuite_iterators.h>
  24
  25 using __gnu_test::test_container;
  26 using __gnu_test::test_range;
  27 using __gnu_test::forward_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 void
  32 test01()
  33 {
  34   int x[] = {3,4,5,1};
  35   test_container<int, forward_iterator_wrapper> cx(x);
  36   VERIFY( ranges::is_sorted(cx.begin(), ranges::next(cx.begin(), 3)) );
  37   VERIFY( !ranges::is_sorted(cx) );
  38   VERIFY( !ranges::is_sorted(cx, ranges::greater{}) );
  39   VERIFY( ranges::is_sorted(cx, {}, [] (int a) { return 0; }) );
  40 }
  41
  42 void
  43 test02()
  44 {
  45   int x[] = {1,2,3,4,5};
  46   test_range<int, forward_iterator_wrapper> rx(x);
  47   VERIFY( ranges::is_sorted(rx) );
  48   VERIFY( !ranges::is_sorted(ranges::begin(rx),
  49                              ranges::next(ranges::begin(rx), 2),
  50                              ranges::greater{}) );
  51 }
  52
  53 constexpr bool
  54 test03()
  55 {
  56   int x[] = { 1,2 };
  57   return (ranges::is_sorted(x)
  58           && ranges::is_sorted(x, x) );
  59 }
  60
  61 int
  62 main()
  63 {
  64   test01();
  65   test02();
  66   static_assert(test03());
  67 }