| // Copyright (C) 2020-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do run { target c++2a } } |
| |
| #include <algorithm> |
| #include <ranges> |
| #include <sstream> |
| #include <testsuite_hooks.h> |
| #include <testsuite_iterators.h> |
| #include <testsuite_rvalref.h> |
| |
| namespace ranges = std::ranges; |
| namespace views = std::views; |
| |
| struct X : __gnu_test::rvalstruct |
| { |
| char c; |
| |
| friend std::istream& |
| operator>>(std::istream& is, X& m) |
| { |
| is >> m.c; |
| return is; |
| } |
| }; |
| |
| |
| void |
| test01() |
| { |
| std::string s = "0123456789"; |
| auto ss = std::istringstream{s}; |
| auto v = ranges::istream_view<X>(ss); |
| VERIFY( ranges::equal(v, s, {}, &X::c) ); |
| } |
| |
| void |
| test02() |
| { |
| auto ints = std::istringstream{"0 1 2 3 4"}; |
| int x[5]; |
| ranges::copy(ranges::istream_view<int>(ints), x); |
| VERIFY( ranges::equal(x, (int[]){0,1,2,3,4}) ); |
| } |
| |
| void |
| test03() |
| { |
| auto input = std::istringstream{"0 1 2 3 4 5 6 7 8 9"}; |
| auto small = [](const auto x) noexcept { return x < 5; }; |
| auto v = ranges::istream_view<int>(input) | views::take_while(small); |
| VERIFY( ranges::equal(v, (int[]){0,1,2,3,4}) ); |
| } |
| |
| template<typename T> |
| concept has_iterator_category = requires { typename T::iterator_category; }; |
| |
| void |
| test04() |
| { |
| std::istringstream s("12345"); |
| auto v = ranges::istream_view<char>(s); |
| // LWG 3397 |
| using It = ranges::iterator_t<decltype(v)>; |
| static_assert(!has_iterator_category<It>); |
| static_assert(std::input_iterator<It>); |
| static_assert(!std::forward_iterator<It>); |
| } |
| |
| void |
| test05() |
| { |
| // PR libstdc++/101231 |
| auto words = std::istringstream{"42"}; |
| auto is = ranges::istream_view<int>(words); |
| auto r = is | views::filter([](auto) { return true; }); |
| for (auto x : r) |
| ; |
| } |
| |
| void |
| test06() |
| { |
| // Default template argument |
| using V = std::ranges::basic_istream_view<int, char>; |
| using W = std::ranges::basic_istream_view<int, char, std::char_traits<char>>; |
| static_assert( std::is_same_v<V, W> ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test03(); |
| test04(); |
| test05(); |
| test06(); |
| } |