std::hash(std::bitset) (3) - Linux Manuals

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

NAME

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