std::hash(std::bitset)
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:
#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
|
(C++11)
|
hash function object (class template) |
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