std::hash (std::string, std::wstring, std::u16string, std::u32string)

De cppreference.com

Definido no cabeçalho `<string>`

`template<> struct hash<std::string>; template<> struct hash<std::wstring>; template<> struct hash<std::u16string>; template<> struct hash<std::u32string>;`		(desde C++11)

The template specializations of std::hash for the various string classes allow users to obtain hashes of strings.

Exemplo

The following code shows one possible output of a hash function used on a string:

#include <iostream>
#include <string>
#include <functional>
 
int main()
{
    std::string s = "Stand back! I've got jimmies!";
    std::hash<std::string> hash_fn;

    size_t hash = hash_fn(s);

    std::cout << hash << '\n';
}

Saída:

Veja também


	hash function object (modelo de classe) [edit]