Survival.refs_at: def of unified-nsga-iii@0.2.2.0
Import: import unified-nsga-iii@0.2.2.0/survival.bend as Survival
Lines 423-424 of unified-nsga-iii@0.2.2.0/survival.bend: https://jend.leeeet.dev/read.txt?path=unified-nsga-iii@0.2.2.0/survival.bend&start_line=423&end_line=424

import Base
import unified-nsga-iii@0.2.2.0/util.bend as Util

def refs_at(+counts: List<&2, Nat>, +need: Nat, refs: List<&2, Nat>) -> List<&2, Nat>:
  Util.filter_halves(~Nat, ~CntNeed, ~refs_at.ok, CN{counts, need}, refs)

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/survival.bend&name=CntNeed
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/survival.bend&name=refs_at.ok
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/util.bend&name=filter_halves