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on 9/11/07 7:44 PM, Daniel Collins at wrote:

> I was just wondering why the aux library provides luaL_opt* functions
> for integers, numbers and strings but not for booleans. It is not a big
> deal since I just define my own as
> int luaL_optboolean (lua_State *L, int narg, int def)
> {
> return lua_isboolean(L, narg) ? lua_toboolean(L, narg) :
> def;
> }
> I am just curious about why some types were chosen for the opt functions
> and some were not.

That doesn't actually have the right semantics for the opt functions.

I believe the standard semantics are:

* None or nil returns default

* Incorrect type throws an error

* Correct type returns that value