Function libsqlite3_sys::sqlite3_create_function

pub unsafe extern "C" fn sqlite3_create_function(
    db: *mut sqlite3, 
    zFunctionName: *const c_char, 
    nArg: c_int, 
    eTextRep: c_int, 
    pApp: *mut c_void, 
    xFunc: Option<unsafe extern "C" fn(arg1: *mut sqlite3_context, arg2: c_int, arg3: *mut *mut sqlite3_value)>, 
    xStep: Option<unsafe extern "C" fn(arg1: *mut sqlite3_context, arg2: c_int, arg3: *mut *mut sqlite3_value)>, 
    xFinal: Option<unsafe extern "C" fn(arg1: *mut sqlite3_context)>
) -> c_int