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