| Defined in header
<variant> | ||
|---|---|---|
template <class... Types> struct hash<std::variant<Types...>>; | (since C++17) |
The template specialization of std::hash for the std::variant template allows users to obtain hashes of variant objects.
| Types | - | the types of the alternatives supported by the variant object |
| Type requirements | ||
-The specializations std::hash<T_i> must satisfy Hash for all T_i in Types.... |
||
Unlike std::hash<std::optional>, hash of a variant does not typically equal the hash of the contained value; this makes it possible to distinguish std::variant<int, int> holding the same value as different alternatives.
| (C++11)
| hash function object (class template) |
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