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std::hash

std：：散列%28std：：位集%29

template struct hash>;​(since C++11)

模板的专门化std::hash为std::bitset<N>允许用户获取类型对象的散列。std::bitset<N>...

例

下面的代码显示了在几个位集上使用的散列函数的一个可能输出：

二次

#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';
}

二次

产出：

二次

67918732
118251589
118251589

二次

另见

hash (C++11)hash function object (class template)

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