std::hash(std::bitset) (3) Linux Manual Page

std::hash(std::bitset) – std::hash(std::bitset)

Synopsis

template<size_t N> struct hash<bitset<N>>; (since C++11)
The template specialization of std::hash for std::bitset<N> allows users to obtain hashes of objects of type std::bitset<N>.

Example

The following code shows one possible output of a hash function used on several bitsets:
// Run this code

#include <iostream>

#include <bitset>

#include <functional>
int main()

{
    std::bitset<4> b1(1);
    std::bitset<4> b2(2);
    std::bitset<4> b3(b2);
    std::hash<std::bitset<4>> hash_fn;
    size_t h1 = hash_fn(b1);
    size_t h2 = hash_fn(b2);
    size_t h3 = hash_fn(b3);
    std::cout << h1 << '\n';
    std::cout << h2 << '\n';
    std::cout << h3 << '\n';
}

Output:

  67918732
  118251589
  118251589

See also

hash hash function object
        (class template)
(C++11)