Re: wish for 5.2

[Hans van der Meer <H.vanderMeer@...>]

On 12 feb 2009, at 21:18, Peter Cawley wrote:

> > (1) extension of the luaL-check.. and luaL_opt.. repertoire with  
> > functions
> > for the retrieval of booleans.
> The behaviour of such a function is very dependant upon the user's
> requirements. Usually none,nil and nil always count as false, and
> everything else is true, and hence lua_toboolean() does the job
> without the need for an opt or check function. Having none or nil have
> some other behaviour would be extremely counter-intuitive in most
> cases.
You are right of course on the interpretation of what is false and  
what is true. But I think the essention of a luaL_optboolean is that  
in the case of an absent argument the optional value (given on the  
call to luaL_optboolean) is returned. That would make luaL_optboolean  
different from lua_toboolean without violating the general definition  
of what is false and what is true.


> > (2) at least one extra table slot on userdata.
> That would be the userdata's environment table -
> http://www.lua.org/manual/5.1/manual.html#lua_setfenv


Did I really miss this easy solution? I am afraid it looks that way!  
First thing in the morning will be to investigate its application to  
the module under development. Thanks!

Hans van der Meer