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1 // Copyright (C) 2020 Free Software Foundation, Inc.
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2 //
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3 // This file is part of the GNU ISO C++ Library. This library is free
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4 // software; you can redistribute it and/or modify it under the
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5 // terms of the GNU General Public License as published by the
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6 // Free Software Foundation; either version 3, or (at your option)
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7 // any later version.
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8
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9 // This library is distributed in the hope that it will be useful,
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10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 // GNU General Public License for more details.
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13
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14 // You should have received a copy of the GNU General Public License along
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15 // with this library; see the file COPYING3. If not see
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16 // <http://www.gnu.org/licenses/>.
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17
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18 // { dg-options "-std=gnu++2a" }
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19 // { dg-do compile { target c++2a } }
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20
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21 #include <sstream>
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22 #include <ranges>
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23
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24 namespace ranges = std::ranges;
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25 namespace views = std::views;
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26
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27 void
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28 test01()
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29 {
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30 std::istringstream s("1 2 3 4 5");
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31 auto v = ranges::istream_view<int>(s);
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32 auto i = v.begin();
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33 static_assert(!std::semiregular<decltype(i)>);
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34 auto o = views::iota(std::move(i));
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35 static_assert(false); // { dg-error "" }
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36 }
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37
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38 // { dg-prune-output "no match" }
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39 // { dg-prune-output "deduction failed" }
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40 // { dg-prune-output "constraint failure" }
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