Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://cplusplus.com/reference/unordered_set/unordered_set/bucket_count/ below:

public member function

<unordered_set>

size_type bucket_count() const noexcept;

Return number of buckets

A bucket is a slot in the container's internal hash table to which elements are assigned based on their hash value.

The number of buckets influences directly the load factor of the container's hash table (and thus the probability of collision). The container automatically increases the number of buckets to keep the load factor below a specific threshold (its max_load_factor), causing a rehash each time the number of buckets needs to be increased.

Member type size_type is an unsigned integral type.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

// unordered_set::bucket_count
#include <iostream>
#include <string>
#include <unordered_set>

int main ()
{
  std::unordered_set<std::string> myset =
  {"Mercury","Venus","Earth","Mars","Jupiter","Saturn","Uranus","Neptune"};

  unsigned n = myset.bucket_count();

  std::cout << "myset has " << n << " buckets.\n";

  for (unsigned i=0; i<n; ++i) {
    std::cout << "bucket #" << i << " contains:";
    for (auto it = myset.begin(i); it!=myset.end(i); ++it)
      std::cout << " " << *it;
    std::cout << "\n";
  }

  return 0;
}

myset has 11 buckets.
bucket #0 contains: 
bucket #1 contains: Venus
bucket #2 contains: Jupiter
bucket #3 contains: 
bucket #4 contains: Neptune Mercury
bucket #5 contains: 
bucket #6 contains: Earth
bucket #7 contains: Uranus Saturn
bucket #8 contains: Mars
bucket #9 contains: 
bucket #10 contains: 

unordered_set::bucket

Locate element's bucket (public member function)

unordered_set::bucket_size

Return bucket size (public member type)

unordered_set::load_factor

Return load factor (public member function)

unordered_set::max_bucket_count

Return maximum number of buckets (public member function)

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4