visitCrossingEdgePairs

Like the above, but visits all pairs of crossing edges where one edge comes from each S2ShapeIndex.

CAVEAT: Crossings may be visited more than once.

  1. bool visitCrossingEdgePairs(S2ShapeIndex index, CrossingType type, EdgePairVisitor visitor)
  2. bool visitCrossingEdgePairs(S2ShapeIndex a_index, S2ShapeIndex b_index, CrossingType type, EdgePairVisitor visitor)

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