In VEX we can't write this:


Because VEX doesn't know what the return type of point() is.

I know I can do this instead:


But I wonder is there a shorter way without declaring an extra variable?

Yes, we can

Cool!

I've got another confusion tho: Is there any difference between


and


?

There really is a difference between them, the first form of vector() is essentially a constructor for creating an object of type vector, the second entry of the form (vector) performs an implicit type cast to a vector, which will not work in this expression since we need to explicitly indicate what type it returns point function.