16
Library introduction
[library]
16.4
Library-wide requirements
[requirements]
16.4.4
Requirements on types and expressions
[utility.requirements]
16.4.4.2
Template argument requirements
[utility.arg.requirements]
Table 28:
Cpp17EqualityComparable
requirements
[tab:cpp17.equalitycomparable]
ðŸ”—
Expression
Return type
Requirement
ðŸ”—
a
=
=
b
decltype
(
a
=
=
b
)
models
boolean-testable
=
=
is an equivalence relation, that is, it has the following properties:
For all
a
,
a
=
=
a
.
If
a
=
=
b
, then
b
=
=
a
.
If
a
=
=
b
and
b
=
=
c
, then
a
=
=
c
.