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152
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1 // { dg-options "-std=gnu++2a" }
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2 // { dg-do run { target c++2a } }
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3
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4 // Copyright (C) 2020 Free Software Foundation, Inc.
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5 //
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6 // This file is part of the GNU ISO C++ Library. This library is free
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7 // software; you can redistribute it and/or modify it under the
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8 // terms of the GNU General Public License as published by the
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9 // Free Software Foundation; either version 3, or (at your option)
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10 // any later version.
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11 //
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12 // This library is distributed in the hope that it will be useful,
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13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 // GNU General Public License for more details.
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16 //
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17 // You should have received a copy of the GNU General Public License along
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18 // with this library; see the file COPYING3. If not see
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19 // <http://www.gnu.org/licenses/>.
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20
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21 #include <unordered_set>
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22 #include <testsuite_hooks.h>
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23
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24 struct aggressive_aggregate
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25 {
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26 int a;
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27 int b;
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28 };
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29
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30 bool operator==(const aggressive_aggregate& a,
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31 const aggressive_aggregate& b)
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32 {
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33 return a.a == b.a;
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34 };
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35
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36 namespace std {
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37 template<> struct hash<aggressive_aggregate> {
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38 size_t operator()(const aggressive_aggregate& x) const {
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39 return std::hash<int>()(x.a);
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40 }
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41 };
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42 }
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43
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44 void test_emplace()
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45 {
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46 std::unordered_set<aggressive_aggregate> x;
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47 auto emplaced = x.emplace(1, 2);
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48 VERIFY(emplaced.first->a == 1);
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49 VERIFY(emplaced.first->b == 2);
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50 emplaced = x.emplace(2);
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51 VERIFY(emplaced.first->a == 2);
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52 VERIFY(emplaced.first->b == 0);
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53 emplaced = x.emplace();
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54 VERIFY(emplaced.first->a == 0);
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55 VERIFY(emplaced.first->b == 0);
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56 }
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57
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58 void test_emplace_hint()
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59 {
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60 std::unordered_set<aggressive_aggregate> x;
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61 auto it = x.emplace_hint(x.begin(),
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62 3, 2);
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63 VERIFY(it->a == 3);
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64 VERIFY(it->b == 2);
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65 it = x.emplace_hint(x.begin(),
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66 4);
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67 VERIFY(it->a == 4);
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68 VERIFY(it->b == 0);
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69 it = x.emplace_hint(x.begin());
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70 VERIFY(it->a == 0);
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71 VERIFY(it->b == 0);
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72 }
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73
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74 int main()
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75 {
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76 test_emplace();
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77 test_emplace_hint();
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78 }
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