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operator==, <=> (std::indirect)

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std::indirect
Defined in header <memory>
Compare two indirect objects
template < class U, class A >

constexpr bool operator == ( const indirect & lhs, const indirect < U, A > & rhs )

noexcept ( noexcept ( * lhs == * rhs ) ) ;
(1) (since C++26)
template < class U, class A >

constexpr /*synth-three-way-result*/ < T, U >

operator <=> ( const indirect & lhs, const indirect < U, A > & rhs ) ;
(2) (since C++26)
Compare an indirect object with a value
template < class U >

constexpr bool operator == ( const indirect & ind, const U & value )

noexcept ( noexcept ( * lhs == value ) ) ;
(3) (since C++26)
template < class U >

constexpr /*synth-three-way-result*/ < T, U >

operator <=> ( const indirect & ind, const U & value ) ;
(4) (since C++26)

Performs comparison operations on indirect objects.

For the definition of /*synth-three-way-result*/ , see synth-three-way-result .

1,2) Compares two indirect objects, the comparison result is defined as follows:
lhs valueless not valueless
rhs valueless not valueless valueless not valueless
operator == true false false * lhs == * rhs
operator <=> ! lhs. valueless_after_move ( ) <=>
! rhs. valueless_after_move ( ) 		synth-three-way
( * lhs, * rhs )
1) If the expression * lhs == * rhs is ill-formed or its result is not convertible to bool , the program is ill-formed.
3,4) Compare an indirect object with a value, the comparison result is defined as follows:
Operator ind is valueless ind is not valueless
operator == false * ind == value
operator <=> std :: strong_ordering :: less synth-three-way  ( * ind, value )
3) If the expression * ind == value is ill-formed or its result is not convertible to bool , the program is ill-formed.

Parameters

lhs, rhs, ind - an indirect object to compare
value - value to compare to the owned value

Return value

As described above.

Example

This section is incomplete
Reason: no example