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#pragma section-numbers 2
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= Scalar evaluators =

XXX TODO: description of the role of scalar evaluators


<<TableOfContents>>

<<Anchor(heuristic)>>
== Heuristics ==

Every HeuristicSpecification defines a ScalarEvaluator.

<<Anchor(g)>>
== g-value evaluator ==

{{{
g()
}}}

Returns the current g-value of the search.

<<Anchor(pref)>>
== Preference evaluator ==

{{{
pref()
}}}

Returns 0 if preferred is true and 1 otherwise.

<<Anchor(sum)>>
== Sum evaluator ==

{{{
sum(evals)
}}}

Calculates the sum of the sub-evaluators.
  * `evals` (list of [[ScalarEvaluator]]s): at least one scalar evaluator


<<Anchor(weight)>>
== Weighted evaluator ==

{{{
weight(scalar_evaluator, weight)
}}}

Multiplies the value of the scalar evaluator with the given weight.
  * `scalar_evaluator` (ScalarEvaluator): scalar evaluator
  * `weight` (int): weight