src/third_party/libc++/trunk/test/containers/unord/unord.multimap/load_factor.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // <unordered_map>
  11
  12 // template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
  13 //           class Alloc = allocator<pair<const Key, T>>>
  14 // class unordered_multimap
  15
  16 // float load_factor() const
  17
  18 #include <unordered_map>
  19 #include <string>
  20 #include <cassert>
  21 #include <cfloat>
  22
  23 #include "min_allocator.h"
  24
  25 int main()
  26 {
  27     {
  28         typedef std::unordered_multimap<int, std::string> C;
  29         typedef std::pair<int, std::string> P;
  30         P a[] =
  31         {
  32             P(10, "ten"),
  33             P(20, "twenty"),
  34             P(30, "thirty"),
  35             P(40, "forty"),
  36             P(50, "fifty"),
  37             P(60, "sixty"),
  38             P(70, "seventy"),
  39             P(80, "eighty"),
  40         };
  41         const C c(std::begin(a), std::end(a));
  42         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
  43     }
  44     {
  45         typedef std::unordered_multimap<int, std::string> C;
  46         typedef std::pair<int, std::string> P;
  47         const C c;
  48         assert(c.load_factor() == 0);
  49     }
  50 #if __cplusplus >= 201103L
  51     {
  52         typedef std::unordered_multimap<int, std::string, std::hash<int>, std::equal_to<int>,
  53                             min_allocator<std::pair<const int, std::string>>> C;
  54         typedef std::pair<int, std::string> P;
  55         P a[] =
  56         {
  57             P(10, "ten"),
  58             P(20, "twenty"),
  59             P(30, "thirty"),
  60             P(40, "forty"),
  61             P(50, "fifty"),
  62             P(60, "sixty"),
  63             P(70, "seventy"),
  64             P(80, "eighty"),
  65         };
  66         const C c(std::begin(a), std::end(a));
  67         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
  68     }
  69     {
  70         typedef std::unordered_multimap<int, std::string, std::hash<int>, std::equal_to<int>,
  71                             min_allocator<std::pair<const int, std::string>>> C;
  72         typedef std::pair<int, std::string> P;
  73         const C c;
  74         assert(c.load_factor() == 0);
  75     }
  76 #endif
  77 }