libcxx/test/std/containers/unord/unord.map/bucket_count.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 // <unordered_map>
  10
  11 // template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
  12 //           class Alloc = allocator<pair<const Key, T>>>
  13 // class unordered_map
  14
  15 // size_type bucket_count() const;
  16
  17 #include <unordered_map>
  18 #include <string>
  19 #include <cassert>
  20 #include <iterator>
  21
  22 #include "test_macros.h"
  23 #include "min_allocator.h"
  24
  25 int main(int, char**)
  26 {
  27     {
  28         typedef std::unordered_map<int, std::string> C;
  29         const C c;
  30         LIBCPP_ASSERT(c.bucket_count() == 0);
  31     }
  32     {
  33         typedef std::unordered_map<int, std::string> C;
  34         typedef std::pair<int, std::string> P;
  35         P a[] =
  36         {
  37             P(10, "ten"),
  38             P(20, "twenty"),
  39             P(30, "thirty"),
  40             P(40, "forty"),
  41             P(50, "fifty"),
  42             P(60, "sixty"),
  43             P(70, "seventy"),
  44             P(80, "eighty"),
  45         };
  46         const C c(std::begin(a), std::end(a));
  47         assert(c.bucket_count() >= 8);
  48     }
  49 #if TEST_STD_VER >= 11
  50     {
  51         typedef std::unordered_map<int, std::string, std::hash<int>, std::equal_to<int>,
  52                             min_allocator<std::pair<const int, std::string>>> C;
  53         const C c;
  54         LIBCPP_ASSERT(c.bucket_count() == 0);
  55     }
  56     {
  57         typedef std::unordered_map<int, std::string, std::hash<int>, std::equal_to<int>,
  58                             min_allocator<std::pair<const int, std::string>>> C;
  59         typedef std::pair<int, std::string> P;
  60         P a[] =
  61         {
  62             P(10, "ten"),
  63             P(20, "twenty"),
  64             P(30, "thirty"),
  65             P(40, "forty"),
  66             P(50, "fifty"),
  67             P(60, "sixty"),
  68             P(70, "seventy"),
  69             P(80, "eighty"),
  70         };
  71         const C c(std::begin(a), std::end(a));
  72         assert(c.bucket_count() >= 8);
  73     }
  74 #endif
  75
  76   return 0;
  77 }