Red Hat ENTERPRISE LINUX 4 - DEVELOPER TOOLS GUIDE, Manual

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114 Chapter 14. Using gdb with Different Languages
For best results when using gnu C ++ , use the DWARF 2 debugging format; if it doesn’t work on
your system, try the stabs+ debugging format. You can select those formats explicitly with the
g++
command-line options
-gdwarf-2
and
-
. .
14.4.1.1. C and C
++
operators
Operators must be defined on values of specific types. For instance,
+
is defined on numbers, but not
on structures. Operators are often defined on groups of types.
For the purposes of C and C
++ , the following definitions hold:
•
Integral types include
int
with any of its storage-class specifiers;
char
;
enum
; and, for C ++ ,
bool
.
•
Floating-point types include
float
,
double
, and
long double
(if supported by the target plat-
form).
•
Pointer types include all types defined as
(
type
*)
.
•
Scalar types include all of the above.
The following operators are supported. They are listed here in order of increasing precedence:
,
The comma or sequencing operator. Expressions in a comma-separated list are evaluated from
left to right, with the result of the entire expression being the last expression evaluated.
=
Assignment. The value of an assignment expression is the value assigned. Defined on scalar
types.
op
=
Used in an expression of the form
a op
=
b
, and translated to
a
=
a op b
.
op
=
and
=
have the
same precedence.
op
is any one of the operators
|
,
^
,
&
,
00
,
11
,
+
,
-
,
*
,
/
,
%
.
?:
The ternary operator.
a
?
b
:
c
can be thought of as: if
a
then
b
else
c
.
a
should be of an
integral type.
||
Logical or. Defined on integral types.
&&
Logical and. Defined on integral types.
|
Bitwise or. Defined on integral types.
^
Bitwise exclusive-or. Defined on integral types.
&
Bitwise and. Defined on integral types.