[fpc-devel] Re: New language feature suggestion (probably not existing in Delphi)

[Sergei Gorelkin]

Max Vlasov пишет:
> 
> 
> On Fri, Nov 26, 2010 at 11:42 AM, Max Vlasov <max.vlasov at gmail.com 
> <mailto:max.vlasov at gmail.com>> wrote:
> 
> 
>     An idea here is to introduce a directive (maybe something else, but
>     directive looks more straightforward), let's call it readonly that
>     forces the method to be able only to read the fields and properties
>     of the object it belongs to and forbid any writing. Sure in this
>     case it only can call only the methods also containing such directive.
> 
> 
> Also, one note to consider
> It is know that some of OOP concepts can be implemented with procedural 
> language. For example, pseudo-encapsulation with the records. 
> Ironically, this idea can be implemented using the emulation.
> 
> Compare
> 
> procedure MyObjFind(var Rec: TMyObjData) with
> procedure MyObjFind(const Rec: TMyObjData)
> 
> the latter is actual readonly emulation, you won't be able to change 
> anything and you won't be able to pass this record by reference to any 
> other procedure
> 
I tend to think that the primary goal of introducing 'const' parameters was optimization, not access 
restriction. Although I don't know exactly.

Sergei