libcxx/test/std/containers/unord/unord.set/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_set>
  12
  13 // template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
  14 //           class Alloc = allocator<Value>>
  15 // class unordered_set
  16
  17 // template <class... Args>
  18 //     pair<iterator, bool> emplace(Args&&... args);
  19
  20 #include <unordered_set>
  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_set<Emplaceable> C;
  31         typedef std::pair<C::iterator, bool> R;
  32         C c;
  33         R r = c.emplace();
  34         assert(c.size() == 1);
  35         assert(*r.first == Emplaceable());
  36         assert(r.second);
  37
  38         r = c.emplace(Emplaceable(5, 6));
  39         assert(c.size() == 2);
  40         assert(*r.first == Emplaceable(5, 6));
  41         assert(r.second);
  42
  43         r = c.emplace(5, 6);
  44         assert(c.size() == 2);
  45         assert(*r.first == Emplaceable(5, 6));
  46         assert(!r.second);
  47     }
  48     {
  49         typedef std::unordered_set<Emplaceable, std::hash<Emplaceable>,
  50                       std::equal_to<Emplaceable>, min_allocator<Emplaceable>> C;
  51         typedef std::pair<C::iterator, bool> R;
  52         C c;
  53         R r = c.emplace();
  54         assert(c.size() == 1);
  55         assert(*r.first == Emplaceable());
  56         assert(r.second);
  57
  58         r = c.emplace(Emplaceable(5, 6));
  59         assert(c.size() == 2);
  60         assert(*r.first == Emplaceable(5, 6));
  61         assert(r.second);
  62
  63         r = c.emplace(5, 6);
  64         assert(c.size() == 2);
  65         assert(*r.first == Emplaceable(5, 6));
  66         assert(!r.second);
  67     }
  68
  69   return 0;
  70 }