Function SCIPexprcurvPower 

pub unsafe extern "C" fn SCIPexprcurvPower(
    basebounds: SCIP_INTERVAL,
    basecurv: SCIP_EXPRCURV,
    exponent: f64,
) -> SCIP_EXPRCURV

gives curvature for base^exponent for given bounds and curvature of base-function and constant exponent