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std::hash(std::shared_ptr)

From cppreference.com
< cpp‎ | memory‎ | shared ptr
 
 
 
Dynamic memory management
Uninitialized storage
(C++17)
(deprecated since c++17)
(deprecated since c++17)
(deprecated since c++17)
Garbage collection support
Miscellaneous
(C++11)
(C++11)
C Library
Low level memory management
 
 
template<class T> struct hash<shared_ptr<T>>;
(since C++11)

The template specialization of std::hash for std::shared_ptr<T> allows users to obtain hashes of objects of type std::shared_ptr<T>.

For a given std::shared_ptr<T> p, this specialization ensures that

std::hash<std::shared_ptr<T>>()(p) == std::hash<T*>()(p.get()).

(until C++17)

std::hash<std::shared_ptr<typename std::shared_ptr<T>::element_type*>>()(p) == std::hash<T*>()(p.get()).

(since C++17)

[edit] Example

[edit] See also

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