这基本上是。然后将其作为第三个模板参数提供给 unordered_map 类型（我假设它是C ++ 0x）。我将其概括为它可以在任何情况下使用，而不是只是 string ：

That's basically it. You then provide it as the third template parameter to the unordered_map type (Which I will assume to be the C++0x one). I would generalize it so it's usable in any situation, rather than just string:

struct dereference_hash
{
    template <typename T>
    std::size_t operator()(const T* pX)
    {
        return std::hash<T>()(*pX);
    }
};

typedef std::unordered_map<std::string*, int, dereference_hash> map_type;