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

   1 // Copyright (C) 2020-2025 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 <algorithm>
  21 #include <testsuite_hooks.h>
  22 #include <testsuite_iterators.h>
  23
  24 using __gnu_test::test_range;
  25 using __gnu_test::test_container;
  26 using __gnu_test::bidirectional_iterator_wrapper;
  27 using __gnu_test::random_access_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30
  31 template<template<typename> typename wrapper>
  32 void
  33 test01()
  34 {
  35   int x[] = { 1, 2, 3, 4 };
  36   test_container<int, wrapper> cx(x);
  37   const int y[] = { 4, 3, 2, 1 };
  38
  39   auto res = ranges::reverse(cx);
  40   VERIFY( res == ranges::end(cx) );
  41   VERIFY( ranges::equal(cx, y) );
  42 }
  43
  44 template<template<typename> typename wrapper>
  45 void
  46 test02()
  47 {
  48   int x[] = { 1, 2, 3, 4, 5 };
  49   test_range<int, wrapper> rx(x);
  50   const int y[] = { 5, 4, 3, 2, 1 };
  51
  52   auto res = ranges::reverse(rx);
  53   VERIFY( res == ranges::end(rx) );
  54   VERIFY( ranges::equal(rx, y) );
  55 }
  56
  57 constexpr bool
  58 test03()
  59 {
  60   int x[] = { 1, 2, 3 };
  61   const int y[] = { 2, 1, 3 };
  62   ranges::reverse(x, x+2);
  63   return ranges::equal(x, y);
  64 }
  65
  66 int
  67 main()
  68 {
  69   test01<bidirectional_iterator_wrapper>();
  70   test02<bidirectional_iterator_wrapper>();
  71
  72   test01<random_access_iterator_wrapper>();
  73   test02<random_access_iterator_wrapper>();
  74
  75   static_assert(test03());
  76 }