Function SCIPinsertDatatreeInt 

pub unsafe extern "C" fn SCIPinsertDatatreeInt(
    scip: *mut SCIP,
    datatree: *mut SCIP_DATATREE,
    name: *const c_char,
    value: c_int,
) -> SCIP_RETCODE

inserts an int value into a SCIP_DATATREE object

The value will be stored as SCIP_Longint.