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- Subject: Re: metatables for strings?
- From: Dirk Laurie <dirk.laurie@...>
- Date: Sun, 3 May 2015 18:35:02 +0200
2015-05-03 18:14 GMT+02:00 Sam Putman <email@example.com>:
> On Sun, May 3, 2015 at 8:32 AM, Nagaev Boris <firstname.lastname@example.org> wrote:
>> On Sun, May 3, 2015 at 3:27 PM, Dirk Laurie <email@example.com> wrote:
>> > I can't guess what you want.
>> I guess Sam wants strings to be like tables: each instance has
>> individual metatable.
> Precisely, but not if we have to pay for it.
The same effect is nearly free, see below.
> The string pointer has a metatable, so we can ("foo"):sub(1,1) and the like.
> It would be nice to be able to add to the metatable chain, so that values
> point to strings can have arbitrary methods, not only one set of privileged
> string functions.
You can put a function in the "string" table and it will immediately
be callable with object-oriented syntax on a string object just like
str:format etc. Since the first argument is provided, that function
can itself pick out a submethod from a table of functions.