replicating MRampAttribute::getValueAtPosition()

[user_deleted]

Hello
I'd like to replicate the getValueAtPosition function from ramp attribute (float version).
The attribute is used on my own locatorNode to control some internal computations, and because the same code is used elsewhere (in renderman procedural) I can't use getValueAtPosition() directly.
I don't need exact 1to1 match, just smth. similar.
What are my options ?

Thanks