libstdc++-v3/testsuite/std/ranges/adaptors/common.cc

   1 // Copyright (C) 2020-2021 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 <ranges>
  23 #include <testsuite_hooks.h>
  24 #include <testsuite_iterators.h>
  25
  26 using __gnu_test::test_range;
  27 using __gnu_test::forward_iterator_wrapper;
  28
  29 namespace ranges = std::ranges;
  30 namespace views = ranges::views;
  31
  32 void
  33 test01()
  34 {
  35   int x[] = {1,2,1,3};
  36   auto v = x | views::common;
  37   VERIFY( std::count(v.begin(), v.end(), 1) == 2);
  38   static_assert(ranges::common_range<decltype(v)>);
  39   static_assert(ranges::view<decltype(v)>);
  40   static_assert(ranges::random_access_range<decltype(v)>);
  41   static_assert(std::same_as<decltype(v), decltype(views::common(v))>);
  42
  43   auto v2 = v | (views::common | views::common);
  44   VERIFY( std::count(v2.begin(), v2.end(), 1) == 2);
  45 }
  46
  47 void
  48 test02()
  49 {
  50   int x[] = {1,2,1,3};
  51   test_range<int, forward_iterator_wrapper> rx(x);
  52   auto v = ranges::common_view(rx);
  53   VERIFY( std::count(v.begin(), v.end(), 1) == 2);
  54   static_assert(ranges::common_range<decltype(v)>);
  55   static_assert(ranges::view<decltype(v)>);
  56   static_assert(ranges::forward_range<decltype(v)>);
  57   static_assert(std::same_as<decltype(v), decltype(views::common(v))>);
  58
  59   auto v2 = v | (views::common | views::common);
  60   VERIFY( std::count(v2.begin(), v2.end(), 1) == 2);
  61 }
  62
  63 int
  64 main()
  65 {
  66   test01();
  67   test02();
  68 }