Hello!

I am trying to replace .+ operator of Numeric class if and only if

argument (summand) is my own class.

To be more specific: I am writing geometry module in Ruby and need to

implement vector-number multiplication so that both:

2 * vector

vector * 2

work well.

Therefore I need to replace .+ method of Numeric without spoiling

arithmetical operations with other classes. It is clear, that in case of

inheritance we can just write:

class MyNumeric < Numeric

def +(object)

super(object) unless object.kind_of?(Vector)

```
# vector-number multiplication here...
```

end

end

But, of course, we need a replacement here. How to implement it?

class Numeric

def +(vector)

unless vector.kinf_of?(Vector)

# What to write here??!

end

```
# vector-number multiplication here...
```

end