std::experimental::observer_ptr
From cppreference.com
< cpp | experimental
| Defined in header <experimental/memory>
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| template< class W > class observer_ptr; |
(library fundamentals TS v2) | |
std::experimental::observer_ptr is a non-owning pointer, or observer. The observer stores a pointer to a second object, known as the watched object. An observer_ptr may also have no watched object.
An observer is not responsible in any way for the watched object; there is no inherent relationship between an observer and the object it watches.
It is intended as a near drop-in replacement for raw pointer types, with the advantage that, as a vocabulary type, it indicates its intended use without need for detailed analysis by code readers.
Specializations of observer_ptr satisfy the requirements of CopyConstructible and CopyAssignable.
| Type requirements | ||
-W shall not be a reference type, but may be an incomplete type.
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Member types
| Member type | Definition |
| element_type | W, the type of the object watched by this observer_ptr
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Member functions
constructs a new observer_ptr (public member function) | |
| (destructor) (implicitly declared) |
destructs an observer_ptr (public member function) |
| operator= (implicitly declared) |
implicitly declared copy and move assignment operators that assign the stored pointer (public member function) |
Modifiers | |
| returns a pointer to the watched object and stops watching the object (public member function) | |
| replaces the watched object (public member function) | |
| swaps the watched objects (public member function) | |
Observers | |
| returns a pointer to the watched object (public member function) | |
| checks if there is an associated watched object (public member function) | |
| dereferences pointer to the watched object (public member function) | |
Conversions | |
| explicit conversion function to the stored pointer (public member function) | |
Non-member functions
creates an observer_ptr that watches an object (function template) | |
compares to another observer_ptr or with nullptr (function template) | |
specializes the swap algorithm (function template) |
Helper classes
hash support for observer_ptr (class template specialization) |
Example
| This section is incomplete Reason: no example |