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

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.

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)