Function proj_sys::proj_coordoperation_get_towgs84_values

pub unsafe extern "C" fn proj_coordoperation_get_towgs84_values(
    ctx: *mut PJ_CONTEXT, 
    coordoperation: *const PJ, 
    out_values: *mut f64, 
    value_count: c_int, 
    emit_error_if_incompatible: c_int
) -> c_int