Function SCIPinferVarUbConsExact 

pub unsafe extern "C" fn SCIPinferVarUbConsExact(
    scip: *mut SCIP,
    var: *mut SCIP_VAR,
    newbound: *mut SCIP_RATIONAL,
    infercons: *mut SCIP_CONS,
    inferinfo: c_int,
    infeasible: *mut c_uint,
    tightened: *mut c_uint,
) -> SCIP_RETCODE

changes upper bound of variable in preprocessing or in the current node, if the new bound is tighter than the current bound; if possible, adjusts bound to integral value; the given inference constraint is stored, such that the conflict analysis is able to find out the reason for the deduction of the bound change

@warning If SCIP is in presolving stage, it can happen that the internal variable array (which can be accessed via SCIPgetVars()) gets resorted.

@return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref SCIP_Retcode “SCIP_RETCODE” for a complete list of error codes.

@pre This method can be called if @p scip is in one of the following stages: - \ref SCIP_STAGE_PROBLEM - \ref SCIP_STAGE_PRESOLVING - \ref SCIP_STAGE_SOLVING

@note During presolving, an integer variable whose bound changes to {0,1} is upgraded to a binary variable.