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- Subject: Re: [ANN} Penlight 0.8 Beta Released
- From: spir <denis.spir@...>
- Date: Thu, 25 Feb 2010 13:38:18 +0100
On Thu, 25 Feb 2010 13:47:51 +0200
steve donovan <steve.j.donovan@gmail.com> wrote:
> What about the constraint that fields of _M may only be modified by
> functions inside _M? That seems a good generalization.
Ahah! I was lately thinking at something similar (in a hypothetical PL), but for for all objects, to implement the famous "command-query separation principle". The idea is that, in a query, assignments can only be local, except probably for names prefixed with "self." (or whatever convention to refer to the target's own fields).
Denis
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