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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 run { target c++2a } }
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20
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21 #include <ranges>
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22 #include <testsuite_iterators.h>
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23 #include <testsuite_hooks.h>
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24
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25 using __gnu_test::test_input_range;
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26
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27 namespace ranges = std::ranges;
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28 namespace views = std::views;
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29
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30 struct my_range
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31 {
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32 static inline int x[] = {1,2,3};
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33 static inline test_input_range<int> r{x};
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34
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35 bool called_begin = false;
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36
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37 auto
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38 begin()
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39 {
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40 called_begin = true;
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41 return r.begin();
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42 }
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43
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44 auto
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45 end()
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46 {
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47 return r.end();
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48 }
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49
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50 ranges::range_difference_t<decltype(r)>
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51 size()
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52 {
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53 VERIFY( !called_begin );
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54 return 3;
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55 }
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56 };
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57
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58 void
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59 test01()
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60 {
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61 my_range r;
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62 static_assert(!ranges::forward_range<my_range>);
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63 static_assert(ranges::sized_range<my_range>);
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64 auto v = r | views::take(3);
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65 auto i = ranges::begin(v);
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66 }
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67
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68 int
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69 main()
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70 {
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71 test01();
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72 }
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