libstdc++-v3/testsuite/23_containers/unordered_map/allocator/minimal.cc

   1 // Copyright (C) 2013-2024 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 <memory>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_allocator.h>
  24
  25 struct T { int i; };
  26
  27 struct hash
  28 {
  29   std::size_t operator()(const T t) const noexcept
  30   { return t.i; }
  31 };
  32
  33 struct equal_to
  34 {
  35   bool operator()(const T& lhs, const T& rhs) const noexcept
  36   { return lhs.i == rhs.i; }
  37 };
  38
  39
  40 bool operator==(const T& l, const T& r) { return l.i == r.i; }
  41 bool operator<(const T& l, const T& r) { return l.i < r.i; }
  42
  43 typedef __gnu_test::SimpleAllocator<std::pair<const T, T>> alloc_type;
  44
  45 template class std::unordered_map<T, T, hash, equal_to, alloc_type>;
  46
  47 void test01()
  48 {
  49   typedef std::allocator_traits<alloc_type> traits_type;
  50   typedef std::unordered_map<T, T, hash, equal_to, alloc_type> test_type;
  51   test_type v(alloc_type{});
  52   v.emplace(std::piecewise_construct,
  53             std::make_tuple(T()), std::make_tuple(T()));
  54   VERIFY( v.max_size() < traits_type::max_size(v.get_allocator()) );
  55 }
  56
  57 int main()
  58 {
  59   test01();
  60   return 0;
  61 }