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Operators

Will Pittenger Bharath Gaddam

List of operators

Below is a complete list of all operators and what they do.

Operator Type Description Overridable Sample Result
and Binary Boolean AND operator true and false false
or Binary Boolean OR operator true or false true
not Unary Boolean NOT operator not false true
nand Binary Boolean NAND operator—shortcut for not (a or b) true nand false true
nor Binary Boolean NOR operator—shortcut for not (a and b) false nor true false
xor Binary Boolean XOR operator—shortcut for (a and not b) or (not a and b) false xor true true
xnor Binary Boolean XNOR operator—shortcut for not a and not b false xnor true false
band Binary Bitwise AND operator
bor Binary Bitwise OR operator
bnot Unary Bitwise NOT operator
bnand Binary Bitwise NAND oeprator—shortcut for not(a bor b)
bnor Binary Bitwise NOR operator—shortcut for bnot (a band b)
bxor Binary Bitwise XOR operator—shortcut for (a band bnot b) bor (bnot a band b)
bxnor Binary Bitwise XNOR operator—shortcut for bnot a band bnot b
+ Binary addition operator 3 + 5 8
- Binary subtraction operator 3 - 5 -2
* Binary multiplication operator 3 * 5 15
/ Binary division operator 15 / 3 5
mod Binary modulus operator 5 mod 3 2
div Binary integer division operator 5 div 3 1
^ Binary mathematical exponential operator 3 ^ 2 9
& Psuedo-unary When this appears before the name of a procedure or property, returns a delegate instance to that procedure or property
? Type modifier Turns a primitive (not structs or enums) into one that can be null—Except for boolean, this may add at least one byte to the storage needed var ? int
() Inner-parameter Parenthetical operator
|| Inner-parameter Mathematical absolute value operator |-5| 5
[] Type modifier Turns a type into an array of the type var int[] array = new int[3]
[] Inner-parameter Array indexer list[5]
[] Inner-parameter (When used with new) allocates an array of size X new String[5]
{} Type modifier Turns a type into a set of that type var int{} v = new int{} 5, 3, 7, 9
{} Inner-parameter list (When used with new) Used to write a set constant new int{} 3, 5, 6, 34
new int{SomeFixedSetInstance} 5, 3, 6, 34
{}f Type modifier Turns a type into a fixed set var int{}f fixed = new int{}f 3, 5, 9, 34</ocde>
{}f Inner-parameter list (When used with new) Used to write a set constant that can't have other members—used to control what can be in normal sets new int{}f 3, 5, 6, 23
. Psuedo-binary Used to access the members of a struct or class name.member
, Pseudo-binary Used to delimit lists when no custom keyword has been specified
= Binary Assignment operator—copies the reference if this is a reference type—not valid for structs a = b
= Binary Equality comparison operator—compares only the reference if this is a reference type—not valid for structs if a = b then
<> ( or ><) Binary Inequality comparison operator—compares only the reference if this is a reference type—not valid for structs if a <> b then
<= (or =<) Binary Less than or equal comparison operator—Undefined by default for non-numeric types if a <= b then
< Binary Less than comparison operator—Undefined by default for non-numeric types if a < b then
>= (or =>) Binary Greater than or equal comparison operator—Undefined by default for non-numeric types if a >= b then
> Binary Greater than comparison operator—Undefined by default for non-numeric types if a > b then
@ Psuedo-binary Base class selector base@ClassName
++ Unary Increment operator x ++
++ Binary Increment operator x ++ y
-- Unary Decrement operator x --
-- Binary Decrement operator x -- y

Precedence

This lists all operators in order of precedence, starting with the highest precedence operators:

, o{} {} [] () and or xor xnor nand nor * / + - & = ++ -- <> >< <= =< < >= => > band bor bxor bxnor bnand bnor not bnot @

Chaining of comparison operators

ASIL allows comparison operators to be chained as long as the resulting expression forms a range. So 4 < a and a < 8 could be written as 4 < a < 8. This is meant to be transparent to those overriding these operators. Below are some samples of situations that can or can’t be combined.

a < b and b < c ' Not a range as there aren’t any constants
4 < b and c > 8 ' Not a range as the operators don’t “point” in the same direction
4 < b and b <= 8 ' Valid range as the operators agree so this could be “4 < b < 8”

You can also chain equality operators as shown below.

(a = b = c) = (a = b and a = c) ' This will always be true

Multiple assignments in one statement

Something like a = b = c will attempt to set a and b to the value of c. If you need to force “b = c” to be a comparison, use the syntax provided in the next section.

Forcing ASIL to interpret operators in a select manner

If ASIL gives you the wrong operator, you can call it with something like typename.+ parameterlist. The code below shows how to set a boolean to the result of a comparison.

Note: The assignment operator can’t be selected this way. This is deliberate and prevents you from making assignments when you wanted a comparison.

var boolean b = c% = d% ' wrong
var boolean b = int.= c%, d% ' correct

Some comparison operators can be referenced with either of two “names”. Those are listed in the table below. The “type” part is a placeholder for the real type name.

Name 1 Name 2
type.<> type.><
type.<= type.=<
type.=> type.>=

Related

Wiki: Custom operators
Wiki: Home
Wiki: keywords-operator
Wiki: operators-abs
Wiki: operators-addition
Wiki: operators-amp
Wiki: operators-and
Wiki: operators-at
Wiki: operators-band
Wiki: operators-bnand
Wiki: operators-bnor
Wiki: operators-bnot
Wiki: operators-bor
Wiki: operators-braces
Wiki: operators-bracesf
Wiki: operators-brackets
Wiki: operators-bxnor
Wiki: operators-bxor
Wiki: operators-can-be-null
Wiki: operators-comma
Wiki: operators-dec
Wiki: operators-div
Wiki: operators-equals
Wiki: operators-exponential
Wiki: operators-float-division
Wiki: operators-gt-equal
Wiki: operators-gt
Wiki: operators-inc
Wiki: operators-inequality
Wiki: operators-lt-equal
Wiki: operators-lt
Wiki: operators-member-access
Wiki: operators-minus
Wiki: operators-mod
Wiki: operators-multiplication
Wiki: operators-nand
Wiki: operators-nor
Wiki: operators-not
Wiki: operators-or
Wiki: operators-paren
Wiki: operators-xnor
Wiki: operators-xor