Re: Safe navigation operator

["Juris Kalnins" <juris@...>]

On Mon, 23 Aug 2010 16:20:34 +0300, Cuero Bugot  
<cbugot@sierrawireless.com> wrote:

> Setting a new value in a table is indeed quite feasible, and the very  
> reason is that it is easy to know when it is the final access (because  
> it calls __newindex for the final access). The quite difficult case is  
> rather to read the table:
> i.e. return config.network.server.url would return nil if either  
> network, or server or url is nil.

Indeed, and I'm sorry I overlooked that.
And it doesn't seem doable, because Lua doesn't have any
"__toboolean" metamethod, nor any other way to virtualize
conversion to boolean value. changing __index /__newindex
doesn't seem to be the right way to fix this.