table of contents
std::hash(std::bitset)(3) | C++ Standard Libary | std::hash(std::bitset)(3) |
NAME¶
std::hash(std::bitset) - std::hash(std::bitset)
Synopsis¶
Defined in header <bitset>
template<std::size_t N> struct hash<std::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 <bitset>
#include <iostream>
#include <functional>
int main()
{
std::bitset<4> b1{0}, b2{42};
std::bitset<8> b3{0}, b4{42};
std::hash<std::bitset<4>> hash_fn4;
std::hash<std::bitset<8>> hash_fn8;
using bin64 = std::bitset<64>;
std::cout
<< bin64{hash_fn4(b1)} << " = " << hash_fn4(b1)
<< '\n'
<< bin64{hash_fn4(b2)} << " = " << hash_fn4(b2)
<< '\n'
<< bin64{hash_fn8(b3)} << " = " << hash_fn8(b3)
<< '\n'
<< bin64{hash_fn8(b4)} << " = " << hash_fn8(b4)
<< '\n';
}
Possible output:¶
0110110100001001111011100010011011010101100001100011011000011001
= 7857072875483051545
1111111101011100010110100000111000111110100000111011100011110000 =
18400681194753865968
0110110100001001111011100010011011010101100001100011011000011001 =
7857072875483051545
0101110000011100011110011010111011100110010000110100110001001101 =
6637313742931709005
See also¶
hash hash function object
(C++11) (class template)
2022.07.31 | http://cppreference.com |