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= Scalar evaluators =

XXX TODO: description of the role of scalar evaluators

 * [[#heuristic|heuristics]]
 * [[#g|g-evaluator]]
 * [[#pref|preference evaluator]]
 * [[#sum|sum evaluator]]
 * [[#weight|weight evaluator]]

<<Anchor(heuristic)>>
=== Heuristic ===

Every [[HeuristicOverview|heuristic]] is 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(evaluator1, evaluator2, ...)
}}}

Calculates the sum of the sub-evaluators.
  * `evaluator1, evaluator2, ...` (comma-separated 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