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std::hash <std::variant>

STD：：散列<std：：Variable>

Defined in header ​​
template <class... Types> struct hash<std::variant<Types...>>;​(since C++17)

模板的专门化std::hash为std::variant模板允许用户获取variant物品。

专业化std::hash<std::variant<Types...>>已启用%28(参见std::hash29%std::hash<std::remove_const_t<Types>>...已启用，否则将禁用。

这种专门化的成员函数不能保证为NoOPTION。

模板参数

Types-the types of the alternatives supported by the variant object

注记

不像std::hash<std::optional>，变体的散列通常不等于包含值的散列；这使得区分是可能的。std::variant<int, int>持有相同的价值与不同的选择。

例

另见

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

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