libstdc++-v3/testsuite/std/ranges/view.cc

   1 // Copyright (C) 2019-2020 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 compile { target c++2a } }
  20
  21 #include <ranges>
  22 #include <vector>
  23 #include <set>
  24 #include <unordered_set>
  25 #include <regex>
  26 #include <testsuite_iterators.h>
  27
  28 static_assert(std::ranges::view<std::vector<int>>);
  29 static_assert(!std::ranges::view<const std::vector<int>>);
  30 static_assert(!std::ranges::view<std::initializer_list<int>>);
  31 static_assert(!std::ranges::view<const std::initializer_list<int>>);
  32 static_assert(!std::ranges::view<std::set<int>>);
  33 static_assert(!std::ranges::view<const std::set<int>>);
  34 static_assert(!std::ranges::view<std::multiset<int>>);
  35 static_assert(!std::ranges::view<std::unordered_set<int>>);
  36 static_assert(!std::ranges::view<std::unordered_multiset<int>>);
  37 static_assert(!std::ranges::view<std::cmatch>);
  38
  39 // const test_random_access_range<T> is not a range:
  40 static_assert(!std::ranges::view<__gnu_test::test_random_access_range<int>>);
  41
  42 template<typename T>
  43 struct test_view
  44 : __gnu_test::test_random_access_range<T>, std::ranges::view_base
  45 {
  46   // views must be default-initializable:
  47   test_view() : __gnu_test::test_random_access_range<T>(nullptr, nullptr) { }
  48 };
  49
  50 static_assert(std::ranges::view<test_view<int>>);
  51
  52 template<>
  53 constexpr bool std::ranges::enable_view<test_view<long>> = false;
  54
  55 static_assert(!std::ranges::view<test_view<long>>);