libcxx/test/std/containers/unord/unord.map/unord.map.modifiers/emplace.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03
  10
  11 // <unordered_map>
  12
  13 // template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
  14 //           class Alloc = allocator<pair<const Key, T>>>
  15 // class unordered_map
  16
  17 // template <class... Args>
  18 //     pair<iterator, bool> emplace(Args&&... args);
  19
  20 #include <unordered_map>
  21 #include <cassert>
  22
  23 #include "test_macros.h"
  24 #include "../../../Emplaceable.h"
  25 #include "min_allocator.h"
  26
  27 int main(int, char**)
  28 {
  29     {
  30         typedef std::unordered_map<int, Emplaceable> C;
  31         typedef std::pair<C::iterator, bool> R;
  32         C c;
  33         R r = c.emplace(std::piecewise_construct, std::forward_as_tuple(3),
  34                                                   std::forward_as_tuple());
  35         assert(r.second);
  36         assert(c.size() == 1);
  37         assert(r.first->first == 3);
  38         assert(r.first->second == Emplaceable());
  39
  40         r = c.emplace(std::pair<const int, Emplaceable>(4, Emplaceable(5, 6)));
  41         assert(r.second);
  42         assert(c.size() == 2);
  43         assert(r.first->first == 4);
  44         assert(r.first->second == Emplaceable(5, 6));
  45
  46         r = c.emplace(std::piecewise_construct, std::forward_as_tuple(5),
  47                                                std::forward_as_tuple(6, 7));
  48         assert(r.second);
  49         assert(c.size() == 3);
  50         assert(r.first->first == 5);
  51         assert(r.first->second == Emplaceable(6, 7));
  52     }
  53     {
  54         typedef std::unordered_map<int, Emplaceable, std::hash<int>, std::equal_to<int>,
  55                             min_allocator<std::pair<const int, Emplaceable>>> C;
  56         typedef std::pair<C::iterator, bool> R;
  57         C c;
  58         R r = c.emplace(std::piecewise_construct, std::forward_as_tuple(3),
  59                                                   std::forward_as_tuple());
  60         assert(r.second);
  61         assert(c.size() == 1);
  62         assert(r.first->first == 3);
  63         assert(r.first->second == Emplaceable());
  64
  65         r = c.emplace(std::pair<const int, Emplaceable>(4, Emplaceable(5, 6)));
  66         assert(r.second);
  67         assert(c.size() == 2);
  68         assert(r.first->first == 4);
  69         assert(r.first->second == Emplaceable(5, 6));
  70
  71         r = c.emplace(std::piecewise_construct, std::forward_as_tuple(5),
  72                                                std::forward_as_tuple(6, 7));
  73         assert(r.second);
  74         assert(c.size() == 3);
  75         assert(r.first->first == 5);
  76         assert(r.first->second == Emplaceable(6, 7));
  77     }
  78
  79   return 0;
  80 }