Method: RubyUnits::Unit#+

Defined in:
lib/ruby_units/unit.rb

#+(other) ⇒ Unit

Add two units together. Result is same units as receiver and scalar and base_scalar are updated appropriately throws an exception if the units are not compatible. It is possible to add Time objects to units of time

Parameters:

  • other (Object)

Returns:

Raises:

  • (ArgumentError) —

    when two temperatures are added

  • (ArgumentError) —

    when units are not compatible

  • (ArgumentError) —

    when adding a fixed time or date to a time span



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# File 'lib/ruby_units/unit.rb', line 822

def +(other)
  case other
  when Unit
    if zero?
      other.dup
    elsif self =~ other
      raise ArgumentError, 'Cannot add two temperatures' if [self, other].all?(&:temperature?)
      if [self, other].any?(&:temperature?)
        if temperature?
          RubyUnits::Unit.new(scalar: (scalar + other.convert_to(temperature_scale).scalar), numerator: @numerator, denominator: @denominator, signature: @signature)
        else
          RubyUnits::Unit.new(scalar: (other.scalar + convert_to(other.temperature_scale).scalar), numerator: other.numerator, denominator: other.denominator, signature: other.signature)
        end
      else
        @q ||= (Rational(@@cached_units[units].scalar, @@cached_units[units].base_scalar) rescue units.to_unit.to_base.scalar)
        RubyUnits::Unit.new(scalar: (base_scalar + other.base_scalar) * @q, numerator: @numerator, denominator: @denominator, signature: @signature)
      end
    else
      raise ArgumentError, "Incompatible Units ('#{self}' not compatible with '#{other}')"
    end
  when Date, Time
    raise ArgumentError, 'Date and Time objects represent fixed points in time and cannot be added to a Unit'
  else
    x, y = coerce(other)
    y + x
  end
end