libstdc++-v3/testsuite/23_containers/unordered_map/modifiers/78595.cc

   1 // Copyright (C) 2018-2025 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++11 } }
  19
  20 #include <unordered_map>
  21 #include <testsuite_hooks.h>
  22
  23 void
  24 test01()
  25 {
  26   struct X {
  27     mutable int conversions = 0;
  28
  29     operator std::pair<const int, int>() const {
  30       if (++conversions > 1)
  31         throw 1;
  32       return {};
  33     }
  34   };
  35
  36   std::unordered_map<int, int> m;
  37   m.insert(X());
  38   VERIFY( m.size() == 1 );
  39   m.insert(m.begin(), X());
  40   VERIFY( m.size() == 1 );
  41
  42 }
  43 void
  44 test02()
  45 {
  46   struct Y {
  47     int conversions = 0;
  48
  49     operator std::pair<const int, int>() && {
  50       if (++conversions > 1)
  51         throw 1;
  52       return {};
  53     }
  54   };
  55
  56   std::unordered_map<int, int> m;
  57   m.insert(Y());
  58   VERIFY( m.size() == 1 );
  59   m.insert(m.begin(), Y());
  60   VERIFY( m.size() == 1 );
  61 }
  62
  63 struct Key {
  64   int key;
  65   bool operator==(const Key& r) const { return key == r.key; }
  66 };
  67
  68 namespace std {
  69   template<> struct hash<Key> {
  70     size_t operator()(const Key& k) const { return std::hash<int>()(k.key); }
  71   };
  72 }
  73
  74 struct Z {
  75   operator std::pair<const Key, int>() const { return { { z }, 0 }; }
  76   int z;
  77 };
  78
  79 template<typename T>
  80 struct Alloc
  81 {
  82   Alloc() = default;
  83
  84   template<typename U>
  85     Alloc(const Alloc<U>&) { }
  86
  87   using value_type = T;
  88
  89   T* allocate(std::size_t n) { return std::allocator<T>().allocate(n); }
  90
  91   void deallocate(T* p, std::size_t n) { std::allocator<T>().deallocate(p, n); }
  92
  93   template<typename U>
  94     void construct(U* p, const Z& z) { ::new (p) U{ { z.z+1 }, 0}; }
  95
  96   template<typename U>
  97     bool operator==(const Alloc<U>&) { return true; }
  98
  99   template<typename U>
 100     bool operator!=(const Alloc<U>&) { return false; }
 101 };
 102
 103 void
 104 test03()
 105 {
 106   std::unordered_map<Key, int, std::hash<Key>, std::equal_to<Key>,
 107                      Alloc<std::pair<const Key, int>>> m;
 108   m.insert(Z{});
 109   m.insert(Z{});
 110   VERIFY( m.size() == 1 );
 111   m.insert(Z{});
 112   m.insert(Z{1});
 113   VERIFY( m.size() == 2 );
 114 }
 115
 116 int
 117 main()
 118 {
 119   test01();
 120   test02();
 121   test03();
 122 }