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    2. 如何在 C++0x 中组合哈希值?

      时间:2023-06-29
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                本文介绍了如何在 C++0x 中组合哈希值?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                问题描述

                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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