==, !=

Equality and inequality. Defined on scalar types. The value of these

 

expressions is 0 for false and non-zero for true.

<, >, <=, >=

Less than, greater than, less than or equal, greater than or equal.

 

Defined on scalar types. The value of these expressions is 0 for false

 

and non-zero for true.

<<, >>

left shift, and right shift. Defined on integral types.

@

The GDB “artificial array” operator (see “Expressions” (page 83)).

+, -

Addition and subtraction. Defined on integral types, floating-point

 

types and pointer types.

*, /, %

Multiplication, division, and modulus. Multiplication and division

 

are defined on integral and floating-point types. Modulus is defined

 

on integral types.

++, --

Increment and decrement. When appearing before a variable, the

 

operation is performed before the variable is used in an expression;

 

when appearing after it, the value of the variable is used before

 

the operation takes place.

*

Pointer dereferencing. Defined on pointer types. Same precedence

 

as ++.

&

Address operator. Defined on variables. Same precedence as ++.

 

For debugging C++, GDB implements a use of '&' beyond what is

 

allowed in the C++ language itself: you can use '&(&ref)' (or, if

 

you prefer, simply '&&ref') to examine the address where a C++

 

reference variable (declared with '&ref') is stored.

-

Negative. Defined on integral and floating-point types. Same

 

precedence as ++.

!

Logical negation. Defined on integral types. Same precedence as

 

++.

~

Bitwise complement operator. Defined on integral types. Same

 

precedence as ++.

., ->

Structure member, and pointer-to-structure member. For

 

convenience, GDB regards the two as equivalent, choosing whether

 

to dereference a pointer based on the stored type information.

 

Defined on struct and union data.

.*, ->*

Dereferences pointers to members.

[]

Array indexing. a[i] is defined as *(a+i). Same precedence as

 

->.

()

Function parameter list. Same precedence as ->.

9.4 Supported languages 107