operator==, <=>(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 |
||
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
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https://en.cppreference.com/cpp/memory/indirect/operator_cmp
