add<E extends num> method
Adds other
to this number.
This does not set the value for this EmpireNullableDoubleProperty.
The result is an double, as described by double.+.
If the underlying value is null
throws an EmpirePropertyNullValueException
.
Implementation
double add<E extends num>(E other) {
return isNotNull
? _value! + other
: throw EmpirePropertyNullValueException(
StackTrace.current, propertyName, runtimeType);
}