libstdc++-v3/testsuite/25_algorithms/reverse/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_range;
  26 using __gnu_test::test_container;
  27 using __gnu_test::bidirectional_iterator_wrapper;
  28 using __gnu_test::random_access_iterator_wrapper;
  29
  30 namespace ranges = std::ranges;
  31
  32 template<template<typename> typename wrapper>
  33 void
  34 test01()
  35 {
  36   int x[] = { 1, 2, 3, 4 };
  37   test_container<int, wrapper> cx(x);
  38   const int y[] = { 4, 3, 2, 1 };
  39
  40   auto res = ranges::reverse(cx);
  41   VERIFY( res == ranges::end(cx) );
  42   VERIFY( ranges::equal(cx, y) );
  43 }
  44
  45 template<template<typename> typename wrapper>
  46 void
  47 test02()
  48 {
  49   int x[] = { 1, 2, 3, 4, 5 };
  50   test_range<int, wrapper> rx(x);
  51   const int y[] = { 5, 4, 3, 2, 1 };
  52
  53   auto res = ranges::reverse(rx);
  54   VERIFY( res == ranges::end(rx) );
  55   VERIFY( ranges::equal(rx, y) );
  56 }
  57
  58 constexpr bool
  59 test03()
  60 {
  61   int x[] = { 1, 2, 3 };
  62   const int y[] = { 2, 1, 3 };
  63   ranges::reverse(x, x+2);
  64   return ranges::equal(x, y);
  65 }
  66
  67 int
  68 main()
  69 {
  70   test01<bidirectional_iterator_wrapper>();
  71   test02<bidirectional_iterator_wrapper>();
  72
  73   test01<random_access_iterator_wrapper>();
  74   test02<random_access_iterator_wrapper>();
  75
  76   static_assert(test03());
  77 }