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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 Modula-2, the
following definitions hold:
INTEGER, CARDINAL, and
their subranges.
CHAR and its subranges.
REAL.
POINTER TO
type.
SET and BITSET types.
BOOLEAN.
The following operators are supported, and appear in order of increasing precedence:
,Function argument or array index separator.
:=Assignment. The value of var := value is
value.
<, >Less than, greater than on integral, floating-point, or enumerated types.
<=, >=Less than or equal to, greater than or equal to
on integral, floating-point and enumerated types, or set inclusion on
set types. Same precedence as <.
=, <>, #Equality and two ways of expressing inequality, valid on scalar types.
Same precedence as <. In GDB scripts, only <> is
available for inequality, since # conflicts with the script
comment character.
INSet membership. Defined on set types and the types of their members.
Same precedence as <.
ORBoolean disjunction. Defined on boolean types.
AND, &Boolean conjunction. Defined on boolean types.
@The GDB “artificial array” operator (see Expressions).
+, -Addition and subtraction on integral and floating-point types, or union and difference on set types.
*Multiplication on integral and floating-point types, or set intersection on set types.
/Division on floating-point types, or symmetric set difference on set
types. Same precedence as *.
DIV, MODInteger division and remainder. Defined on integral types. Same
precedence as *.
-Negative. Defined on INTEGER and REAL data.
^Pointer dereferencing. Defined on pointer types.
NOTBoolean negation. Defined on boolean types. Same precedence as
^.
.RECORD field selector. Defined on RECORD data. Same
precedence as ^.
[]Array indexing. Defined on ARRAY data. Same precedence as ^.
()Procedure argument list. Defined on PROCEDURE objects. Same precedence
as ^.
::, .GDB and Modula-2 scope operators.
Warning: Set expressions and their operations are not yet supported, so GDB treats the use of the operator
IN, or the use of operators+,-,*,/,=, ,<>,#,<=, and>=on sets as an error.
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