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Switch that can omit argument.

Methods
P

Instance Public methods

parse(arg, argv, &error)

Parses argument if given, or uses default value.

Source: show | on GitHub 

# File ruby/lib/optparse.rb, line 754
def parse(arg, argv, &error)
  if arg
    conv_arg(*parse_arg(arg, &error))
  else
    conv_arg(arg)
  end
end