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.
Specializations of observer_ptr satisfy the requirements of CopyConstructible and CopyAssignable.
| Type requirements | ||
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W shall not be a reference type, but may be an incomplete type.
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Contents |
[edit] Member types
| Member type | Definition |
| element_type | W, the type of the object watched by this observer_ptr
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| pointer | std::add_pointer_t<W>. For exposition only. |
[edit] Member functions
constructs a new observer_ptr (public member function) |
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| (destructor)
(implicitly declared)
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destructs an observer_ptr (public member function) |
| operator=
(implicitly declared)
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implicitly declared copy and move assignment operators that assign the stored pointer (public member function) |
Modifiers |
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| returns a pointer to the watched object and stops watching the object (public member function) |
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| replaces the watched object (public member function) |
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| swaps the watched objects (public member function) |
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Observers |
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| returns a pointer to the watched object (public member function) |
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| checks if there is an associated watched object (public member function) |
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| dereferences pointer to the watched object (public member function) |
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Conversions |
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| explicit conversion function to the stored pointer (public member function) |
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[edit] Non-member functions
creates a observer_ptr that watches an object (function template) |
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compares to another observer_ptr or with nullptr (function template) |
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specializes the swap algorithm (function template) |
[edit] Helper classes
hash support for observer_ptr (class template specialization) |
[edit] Example
| This section is incomplete Reason: no example |