pub unsafe extern "C" fn spral_rb_write(
filename: *const c_char,
matrix_type: spral_matrix_type,
m: c_int,
n: c_int,
ptr: *const i64,
row: *const c_int,
val: *const f64,
options: *const spral_rb_write_options,
title: *const c_char,
identifier: *const c_char,
) -> c_int