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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 <iterator>
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22
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23 #ifndef __cpp_lib_constexpr_iterator
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24 # error "Feature test macro for constexpr insert iterators is missing in <iterator>"
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25 #elif __cpp_lib_constexpr_iterator < 201811L
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26 # error "Feature test macro for constexpr insert iterators has wrong value in <iterator>"
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27 #endif
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28
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29 struct container
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30 {
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31 using value_type = int;
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32
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33 constexpr int* begin() { return std::begin(data); }
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34 constexpr int* end() { return last; }
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35
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36 constexpr int* insert(int* pos, int val)
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37 {
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38 if (last == std::end(data))
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39 throw val;
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40 for (int* i = last++; i != pos; --i)
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41 i[1] = i[0];
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42 *pos = val;
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43 return pos;
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44 }
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45
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46 int data[3];
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47 int* last = std::begin(data);
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48 };
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49
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50 constexpr bool
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51 test01()
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52 {
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53 container c;
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54 std::insert_iterator<container> iter;
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55 iter = std::inserter(c, c.begin());
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56 *iter++ = 1;
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57 int i = 2;
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58 *iter = i;
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59 *++iter = 3;
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60 return c.data[0] == 1 && c.data[1] == 2 && c.data[2] == 3;
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61 }
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62
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63 static_assert( test01() );
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