Function check_option

pub fn check_option(
    state: &mut LuaState,
    arg: i32,
    def: Option<&[u8]>,
    lst: &[&[u8]],
) -> Result<usize, LuaError>

Expand description

Check that arg is one of the strings in lst and return its index. If def is Some it is used as default when arg is absent/nil.

C: LUALIB_API int luaL_checkoption(lua_State *L, int arg, const char *def, const char *const lst[])

check_option