operator==,!=,<,<=,>,>=(std::experimental::observer_ptr)

 

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)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support 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

 

template< class W1, class W2 > bool operator==( const observer_ptr<W1>& p1, const observer_ptr<W2>& p2 );	(1)	(library fundamentals TS v2)
template< class W1, class W2 > bool operator!=( const observer_ptr<W1>& p1, const observer_ptr<W2>& p2 );	(2)	(library fundamentals TS v2)
template< class W > bool operator==( const observer_ptr<W>& p, std::nullptr_t ) noexcept;	(3)	(library fundamentals TS v2)
template< class W > bool operator==( std::nullptr_t, const observer_ptr<W>& p ) noexcept;	(4)	(library fundamentals TS v2)
template< class W > bool operator!=( const observer_ptr<W>& p, std::nullptr_t ) noexcept;	(5)	(library fundamentals TS v2)
template< class W > bool operator!=( std::nullptr_t, const observer_ptr<W>& p ) noexcept;	(6)	(library fundamentals TS v2)
template< class W1, class W2 > bool operator<( const observer_ptr<W1>& p1, const observer_ptr<W2>& p2 );	(7)	(library fundamentals TS v2)
template< class W1, class W2 > bool operator>( const observer_ptr<W1>& p1, const observer_ptr<W2>& p2 );	(8)	(library fundamentals TS v2)
template< class W1, class W2 > bool operator<=( const observer_ptr<W1>& p1, const observer_ptr<W2>& p2 );	(9)	(library fundamentals TS v2)
template< class W1, class W2 > bool operator>=( const observer_ptr<W1>& p1, const observer_ptr<W2>& p2 );	(10)	(library fundamentals TS v2)

Compares the pointer values of two observer_ptrs, or an observer_ptr and nullptr.

1,2) Equality comparison for two observer_ptrs.

3-6) Equality comparison for an observer_ptr and nullptr.

7-10) Ordered comparison for two observer_ptrs.

Parameters

p, p1, p2

-

observer_ptrs to compare

Return value

1) p1.get() == p2.get()

2) !(p1 == p2)

3,4) !p

5,6) (bool)p

7) std::less<W3>()(p1.get(), p2.get()), where W3 is the composite pointer type of W1* and W2*.

8) p2 < p1

9) !(p2 < p1)

10) !(p1 < p2)