std::hash <std::variant>
Defined in header <variant>
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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.
The specialization std::hash<std::variant<Types...>> is enabled (see std::hash) if every specialization in std::hash<std::remove_const_t<Types>>... is enabled, and is disabled otherwise.
The member functions of this specialization are not guaranteed to be noexcept.
Template parameters
Types | - | the types of the alternatives supported by the variant object
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Notes
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.
Example
This section is incomplete Reason: no example |
See also
(C++11) |
hash function object (class template) |