Function papilo_problem_add_simple_row 

pub unsafe extern "C" fn papilo_problem_add_simple_row(
    problem: *mut PAPILO_PROBLEM,
    rowtype: c_uchar,
    side: f64,
    rowname: *const c_char,
) -> c_int

Add one simple linear constraint (no ranged row) to the problem and returns its index. If rowname is NULL generic names are used.