Command.argument

define the argument with default value for command, used for variadic argument

  1. Self argument(string name, string desc)
  2. Self argument(string name, string desc, T val)
  3. Self argument(string name, string desc, T val, T[] rest)
    class Command
    argument
    (
    T
    )
    (
    string name
    ,
    string desc
    ,
    T val
    ,)
    if (
    !is(T == bool)
    )
  4. Self argument(string name, string desc, T defaultVal)

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