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Trying to translate formula for blending mode

I am using opencv c++ for making the blending mode like in photoshop , i want to make overlay mode in it , i search its alternate in opencv in which i found this blending way , but its not the overlay as i want to use the overlay method in it.

overlay method formula from this documentation

(Target > 0.5) * (1 - (1-2*(Target-0.5)) * (1-Blend)) +
(Target <= 0.5) * ((2*Target) * Blend)

Can any one please explain this formula for implementation in opencv c++ , how i can easy understand it for implementation or is there any already build in function for it or any other easy way out :P