16
Language support library
[language.support]
16.11
Comparisons
[cmp]
16.11.3
Class template
common_comparison_category
[cmp.common]
1
#
The type
common_comparison_category
provides an alias for the strongest comparison category to which all of the template arguments can be converted
.
[
Note
:
A comparison category type is stronger than another if they are distinct types and an instance of the former can be converted to an instance of the latter
.
—
end note
]
🔗
template
<
class
.
.
.
Ts
>
struct
common_comparison_category
{
using
type
=
see below
;
}
;
2
#
Remarks:
The member
typedef-name
type
denotes the common comparison type (
[class.spaceship]
) of
Ts
.
.
.
, the expanded parameter pack
.
[
Note
:
This is well-defined even if the expansion is empty or includes a type that is not a comparison category type
.
—
end note
]