Function SCIPtreeAddDiveBoundChange 

pub unsafe extern "C" fn SCIPtreeAddDiveBoundChange(
    tree: *mut SCIP_TREE,
    blkmem: *mut BMS_BLKMEM,
    var: *mut SCIP_VAR,
    dir: SCIP_BRANCHDIR,
    value: f64,
    preferred: c_uint,
) -> SCIP_RETCODE

adds a diving bound change to the tree together with the information if this is a bound change for the preferred direction or not