operator * method

Quantity operator *(dynamic multiplier)

Returns the product of this quantity and multiplier, which is expected to be either a Quantity, num or Number object. All other types will cause a QuantityException to be thrown.

• This Quantity object is unaffected.
• The uncertainty of the resulting product Quantity is equal to the relative combined standard uncertainty, defined as the square root of the sum of the squares of the two quantities' relative standard uncertainties.

Implementation

Quantity operator *(dynamic multiplier) {
  if (multiplier is num || multiplier is Number) return this * Scalar(value: multiplier);

  // Product uncertainty
  var productUr = _ur;

  // Product value
  Number productValue;

  // Product dimensions
  var productDimensions = dimensions;

  // Branch on Quantity, num, Number
  if (multiplier is Quantity) {
    final q2 = multiplier;
    productDimensions = dimensions * q2.dimensions;
    productValue = valueSI * q2.valueSI;
    productUr = (_ur != 0.0 || q2._ur != 0.0) ? math.sqrt(_ur * _ur + q2._ur * q2._ur) : 0.0;
  } else {
    throw const QuantityException('Expected a Quantity, num or Number object');
  }

  if (dynamicQuantityTyping) {
    return productDimensions.toQuantity(productValue, null, productUr);
  } else {
    return MiscQuantity(productValue, productDimensions, productUr);
  }
}