Collection.opApply

Undocumented in source. Be warned that the author may not have intended to support it.
  1. int opApply(int delegate(ref T) dg)
  2. int opApply(int delegate(ref int, ref T) dg)
    class Collection(T)
    int
    opApply
    (
    int delegate
    (
    ref int
    ,
    ref T
    )
    dg
    )

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