std::experimental::observer_ptr<W>::operator bool

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

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)

Experimental Non-TS

Pattern Matching

Linear Algebra

std::execution

Contracts

2D Graphics

 

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 explicit operator bool() const noexcept;		(library fundamentals TS v2)

Checks whether *this has an associated watched object, i.e. whether get() != nullptr.

Parameters

(none)

Return value

true if *this has an associated watched object, false otherwise.

Example

See also

get	returns a pointer to the watched object (public member function)

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