Operators

Introduction

Operator precedence

Operator	Description	Precedence
New	New object or array	1
Null	Null value
Self	Self instance
Super	Super instance
True	Boolean true
False	Boolean false
Typeof	Typeof operator
Cast	Cast operator
Lambda	Lambda function
identifier	Identifier
literal	Literal value
?.	Safe postfix member access	2
.	Postfix member acccess
( )	Postfix Invoke
[ ]	Postfix Index
< >	Postfix Generic instance
Varptr	Unary variable address	3
-	Unary numeric negate
~	Unary integer complement
Not	Unary boolean invert
*	Numeric multiplication	4
/	Numeric division
Mod	Numeric modulo
+	Numeric addition	5
-	Numeric subtraction
Shl	Integer shift left	6
Shr	Integer shift right
&	Integer and	7
~	Integer xor
\|	Integer or	8
<=>	Compare	9
<	Less than	10
>	Greater than
<=	Less than or equal
>=	Greater than or equal
=	Equal	11
<>	Not equal
And	Boolean and	12
Or	Boolean or	13
? Else	If-then-else	14
?Else	'Elvis operator'

The safe member access operator allows you to safely access members of a possibly null object. Accessing a field, property or method of a null object using the plain '.' operator will cause a 'null object runtime error' in debug mode - in release it will likely just crash the program. However, using '?.' instead will cause a null value of the expected type to be returned instead, preventing the runtime error occuring. Note however that this involves some overhead as it means the object must be checked before it is accessed.

The 'Elvis operator' is a binary operator that returns its left hand argument if it is non-null, otherwise it returns its right hand argument. It is similar to 'X<>Null ? X Else Null' except that 'X' is only evaluted once.