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if Integer.instance_method(:round).arity.zero?
require 'backports/tools/alias_method_chain'
require 'backports/tools/arguments'
class Integer
def round_with_digits(ndigits=0)
ndigits = Backports::coerce_to_int(ndigits)
case
when ndigits.zero?
self
when ndigits > 0
raise RangeError if ndigits >= 1<<31
Float(self)
else
pow = 10 ** (-ndigits)
return 0 if pow.is_a?(Float) # when ndigits hugely negative
remain = self % pow
comp = self < 0 ? :<= : :<
remain -= pow unless remain.send(comp, pow / 2)
self - remain
end
end
Backports.alias_method_chain self, :round, :digits
end
end
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