Namespaces
Variants
Views
Actions

std::hash <std::optional>

From cppreference.com
< cpp‎ | experimental‎ | optional
Revision as of 16:54, 1 July 2013 by P12bot (Talk | contribs)

Template:cpp/utility/optional/navbar

Defined in header <optional>
template<class T>
struct hash<std::optional<T>>;
(since C++14)

The template specialization of std::hash for the std::optional class allows users to obtain hashes of the values contained in optional objects.

Template parameters

T - the type of the value contained in optional object. The specialization std::hash<T> must meet the requirements of class template hash.

Example

See also

(C++11)
hash function object
(class template) [edit]