Map.opApply

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

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