7
Expressions
[expr]
7.6
Compound expressions
[expr.compound]
7.6.2
Unary expressions
[expr.unary]
7.6.2.3
Increment and decrement
[expr.pre.incr]
1
#
The operand of prefix
+
+
is modified (
[defns.
access]
) by adding
1
.
The operand shall be a modifiable lvalue
.
The type of the operand shall be an arithmetic type other than
cv
bool
, or a pointer to a completely-defined object type
.
An operand with volatile-qualified type is deprecated; see
[depr.
volatile.
type]
.
The result is the updated operand; it is an lvalue, and it is a bit-field if the operand is a bit-field
.
The expression
+
+
x
is equivalent to
x
+
=
1
.
[
Note
1
:
See the discussions of
addition
and
assignment operators
for information on conversions
.
—
end note
]
2
#
The operand of prefix
-
-
is modified (
[defns.
access]
) by subtracting
1
.
The requirements on the operand of prefix
-
-
and the properties of its result are otherwise the same as those of prefix
+
+
.
[
Note
2
:
For postfix increment and decrement, see
[expr.
post.
incr]
.
—
end note
]