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

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

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

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.

p, p1, p2 - observer_ptrs to compare

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)

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

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