<Operators>

Expressions

The precedences are listed in decreasing precedence order. For instance, multiplication binds stronger than addition, which means that "1+2*3" is understood as "1+(2*3)"

Operator	Description	Associativity


(__)	parentheses	N/A
(type) __	type conversion	N/A
\|__\|	vector size	N/A
\|__\|	relation size	N/A
\|__\|	string size	N/A
({__})	expression-statement	N/A

__[__]	string indexing (between 0 and \|s\|-1)	N/A
__[__]	vector indexing (between 0 and \|v\|-1)	N/A
__[__..__]	substring (s[a..b] is from a to b-1)	N/A
__[__..__]	subvector (v[a..b] is from a to b-1)	N/A
__.__	tuple member reference	left

!__	logical NOT	N/A
-__	unary minus	N/A
+__	unary plus	N/A
++__	pre increment	N/A
--__	pre decrement	N/A
__++	post increment	N/A
__--	post decrement	N/A

__<[__]	document plug	N/A

__*__	multiplication	left
__/__	integer division	left
__/__	float division	left
__%__	modulo	left

__\+(__)	tuple project	N/A
__\-(__)	tuple project complement	N/A

__+__	addition	left
__+__	string concatenation	left
__+__	vector concatenation	left
__-__	substraction	left

__<<__	left tuple overwrite	left
__>>__	right tuple overwrite	left

__<__	less than	N/A
__>__	greater than	N/A
__<=__	less than or equal	N/A
__>=__	greater than or equal	N/A

__==__	equal	left
__!=__	not equal	left

__&&__	lazy logical AND	left

__\|\|__	lazy logical OR	left

__?__:__	conditional operator	right

__=__	assignment	right
__+=__	addition, then assignment	right
__-=__	substraction, then assignment	right
__*=__	multiplication, then assignment	right
__/=__	division, then assignment	right
__%=__	modulo, then assignment	right
__=<[__]	plug, then assign	right

lazy: means that if the result of an expression can be determined by evaluating the left operand only, then the right operand is not evaluated. This makes a difference when the right operand has side-effects or does not terminate.
left: means that the given operator is left-associative. For instance, "x+y+z" will be parsed as "(x+y)+z".
right: means that the given operator is right-associative. For instance, "x=y=z" will be parsed as "x=(y=z)".

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Last updated: November 2, 2001