KeyInputRange.opApply

Undocumented in source. Be warned that the author may not have intended to support it.
  1. int opApply(int delegate(K) dg)
  2. int opApply(int delegate(size_t, K) dg)
    class KeyInputRange
    int
    opApply
    (
    scope int delegate
    (
    size_t
    ,
    K
    )
    dg
    )

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