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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 <span>
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22
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23 struct Range
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24 {
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25 int* begin();
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26 int* end();
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27 unsigned size() const;
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28 } r;
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29
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30 auto first = std::begin(r), last = std::end(r);
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31
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32 // span(It, size_type)
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33 std::span<int> s1 = {first, 2};
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34 std::span<int, 2> s2 = {first, 2}; // { dg-error "could not convert" }
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35
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36 // span(It, End)
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37 std::span<int> s3 = {first, last};
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38 std::span<int, 2> s4 = {first, last}; // { dg-error "could not convert" }
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39
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40 // span(R&&)
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41 std::span<int> s5 = r;
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42 std::span<int, 2> s6 = r; // { dg-error "conversion from" }
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43
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44 // span(const span<OtherElement, OtherExtent>&)
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45 std::span<const int> s7 = s5;
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46 std::span<const int> s8 = s6;
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47 std::span<const int, 1> s9 = s5.first(1); // { dg-error "conversion from" }
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48 std::span<const int, 1> s10 = s7.first(1); // { dg-error "conversion from" }
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