libcxx/test/std/containers/associative/map/map.access/max_size.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 // <map>
  10
  11 // class map
  12
  13 // size_type max_size() const;
  14
  15 #include <cassert>
  16 #include <limits>
  17 #include <map>
  18 #include <type_traits>
  19
  20 #include "test_allocator.h"
  21 #include "test_macros.h"
  22
  23 int main(int, char**)
  24 {
  25   typedef std::pair<const int, int> KV;
  26   {
  27     typedef limited_allocator<KV, 10> A;
  28     typedef std::map<int, int, std::less<int>, A> C;
  29     C c;
  30     assert(c.max_size() <= 10);
  31     LIBCPP_ASSERT(c.max_size() == 10);
  32   }
  33   {
  34     typedef limited_allocator<KV, (std::size_t)-1> A;
  35     typedef std::map<int, int, std::less<int>, A> C;
  36     const C::size_type max_dist =
  37         static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
  38     C c;
  39     assert(c.max_size() <= max_dist);
  40     LIBCPP_ASSERT(c.max_size() == max_dist);
  41   }
  42   {
  43     typedef std::map<char, int> C;
  44     const C::size_type max_dist =
  45         static_cast<C::size_type>(std::numeric_limits<C::difference_type>::max());
  46     C c;
  47     assert(c.max_size() <= max_dist);
  48     assert(c.max_size() <= alloc_max_size(c.get_allocator()));
  49   }
  50
  51   return 0;
  52 }