std::experimental::observer_ptr<W>::observer_ptr

 

C++

Compiler support

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Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

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Filesystem library (C++17)

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Technical specifications

Symbols index

External libraries

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

Concepts (concepts TS)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

 

Library fundamentals v2

experimental::propagate_const

experimental::not_fn

experimental::observer_ptr

experimental::make_array

experimental::to_array

experimental::ostream_joiner

experimental::gcd

experimental::lcm

experimental::source_location

experimental::randint

detection idiom

uniform container erasure

logical operator type traits

 

std::experimental::observer_ptr

Member functions

observer_ptr::observer_ptr

Modifiers

observer_ptr::release

observer_ptr::reset

observer_ptr::swap

Observers

observer_ptr::get

observer_ptr::operator bool

observer_ptr::operator*observer_ptr::operator->

Conversions

observer_ptr::operator element_type*

Non-member functions

make_observer

operator==operator!=operator<operator>operator<=operator>operator>=

swap

std::hash

 

constexpr observer_ptr() noexcept; constexpr observer_ptr( nullptr_t ) noexcept;	(1)	(library fundamentals TS v2)
constexpr explicit observer_ptr( element_type* p ) noexcept;	(2)	(library fundamentals TS v2)
template<class W2> constexpr observer_ptr( observer_ptr<W2> other ) noexcept;	(3)	(library fundamentals TS v2)
observer_ptr( const observer_ptr& other ) = default;	(4)	(library fundamentals TS v2) (implicitly declared)
observer_ptr( observer_ptr&& other ) = default;	(5)	(library fundamentals TS v2) (implicitly declared)

1) Constructs an observer_ptr that has no corresponding watched object.

2) Constructs an observer_ptr that watches p.

3) Constructs an observer_ptr that watches other.get(). This overload participates in overload resolution only if W2* is convertible to element_type*.

4-5) Implicitly declared copy and move constructors. Constructs an observer_ptr that watches other.get().

Parameters

p	-	a pointer to an object to watch
other	-	another observer_ptr to copy from