luaL_optstring
[-0, +0, v]
const char *luaL_optstring (lua_State *L, int arg, const char *d);
If the function argument arg
is a string, returns this string. If this argument is absent or is nil, returns d
. Otherwise, raises an error.
luaL_optstring
[-0, +0, v]
const char *luaL_optstring (lua_State *L, int arg, const char *d);
If the function argument arg
is a string, returns this string. If this argument is absent or is nil, returns d
. Otherwise, raises an error.
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