如何在 C++0x 中组合哈希值?

2021-12-24 00:00:00 hash c++ c++11 boost std

C++0x 添加了 hash<...>(...).

C++0x adds hash<...>(...).

我找不到 hash_combine 函数，如 提升.实现这样的事情的最干净的方法是什么?也许，使用 C++0x xor_combine?

I could not find a hash_combine function though, as presented in boost. What is the cleanest way to implement something like this? Perhaps, using C++0x xor_combine?

推荐答案

好吧，就像 boost 人员那样做:

Well, just do it like the boost guys did it:

template <class T>
inline void hash_combine(std::size_t& seed, const T& v)
{
    std::hash<T> hasher;
    seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
}

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