protocol
_Incrementable
Inheritance |
Equatable
View Protocol Hierarchy →
|
---|---|
Import |
|
Instance Methods
Return true if lhs
is equal to rhs
.
Equality implies substitutability. When x == y
, x
and
y
are interchangeable in any code that only depends on their
values.
Class instance identity as distinguished by triple-equals ===
is notably not part of an instance's value. Exposing other
non-value aspects of Equatable
types is discouraged, and any
that are exposed should be explicitly pointed out in
documentation.
Equality is an equivalence relation
x == x
istrue
x == y
impliesy == x
x == y
andy == z
impliesx == z
Inequality is the inverse of equality, i.e. !(x == y)
iff
x != y
Declaration
func
==(
lhs
:
Self
,
rhs
:
Self
) -
>
Bool
Declared In
Equatable
Return the next consecutive value in a discrete sequence of
Self
values
Requires: self
has a well-defined successor.
Declaration
func
successor
() -
>
Self
1 inherited item hidden. (Show all)
This protocol is an implementation detail of
ForwardIndexType
; do not use it directly.Its requirements are inherited by
ForwardIndexType
and thus must be satisfied by types conforming to that protocol.