Map.opApply

Traverse all entries using foreach. TODO: turn this into ranges

  1. int opApply(int delegate(ref Key) dg)
    struct Map(Key, V)
    int
    opApply
    (
    int delegate
    (
    ref Key
    )
    dg
    )
  2. int opApply(int delegate(ref Key, ref V) dg)

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