C++ Bitset Library - hash() Function

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Description

The C++ function std::bitset::hash() returns hash value based on the provided bitset. It always returns same hash value for same bitset.

Declaration

Following is the declaration for std::bitset::hash() function form std::bitset header.

C++11

 template <class T> struct hash; template <size_t N> struct hash<bitset<N>>; 

Return value

Calculates and returns a hash value based on bitset.

Example

 #include <iostream> #include <bitset> using namespace std; int main(void) { bitset<4> b1(1); bitset<4> b2(4); std::hash<std::bitset<4>> hash_fun; cout << "Hash function for b1 = " << hash_fun(b1) << endl; cout << "Hash function for b2 = " << hash_fun(b2) << endl; return 0; } 

Let us compile and run the above program, this will produce the following result −

 Hash function for b1 = 4334672815104069193 Hash function for b2 = 4228082005917330485