| Extracted from Pike v7.8 release 866 at 2018-02-09.

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ADT
ADT.Relation
ADT.Relation.Binary

# Method ADT.Relation.Binary()->filter_destructively()

Method filter_destructively

  `this_program filter_destructively(function f)`

Description

  Filters the entries in the relation destructively, removing all entries for which the filtering function f returns false. The function f gets two arguments: the left and the right value for each entry in the relation.