pub unsafe extern "C" fn GRBaddvars(
model: *mut GRBmodel,
numvars: c_int,
numnz: c_int,
vbeg: *const c_int,
vind: *const c_int,
vval: *const c_double,
obj: *const f64,
lb: *const f64,
ub: *const f64,
vtype: *const c_char,
name: *const c_str
) -> c_int
