Initializing help system before first use

# getarity

Purpose
Returns the number of decision variables involved in the constraint; this function can be used, for instance, to design advanced search heuristics
Synopsis
`function getarity(ctr:cpctr) : integer`
Argument

ctr | the constraint to explore

Return value
The number of variables involved in ctr
Example
The following example shows how to get the arity of a constraint

    getarity(x + y = 3)

Parent Topic Constraint parameters

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