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

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals 2 TS)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Concepts (concepts TS)

Ranges (ranges TS)

Special mathematical functions (special math 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

 

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 a 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)