Module: Duration::Arithmetic

Included in:
Duration
Defined in:
lib/duration/arithmetic.rb

Instance Method Summary collapse

Instance Method Details

#+(other_duration) ⇒ Object

Raises:

  • (StandardError) 


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# File 'lib/duration/arithmetic.rb', line 3

def + other_duration
  raise StandardError.new("Cannot add #{other_duration.class} to #{self}") unless other_duration.respond_to?(:to_i)
  other_duration = other_duration.to_duration if other_duration.respond_to?(:to_duration)
  Duration.new(self.to_i + other_duration.to_i)
end

#-(other_duration) ⇒ Object

Raises:

  • (StandardError) 


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# File 'lib/duration/arithmetic.rb', line 9

def - other_duration
  raise StandardError.new("Cannot subtract #{other_duration.class} from #{self}") unless other_duration.respond_to?(:to_i)
  other_duration = other_duration.to_duration if other_duration.respond_to?(:to_duration)
  Duration.new(self.to_i - other_duration.to_i)
end