<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">I see. <div>I was proposing to a guy for his phd topic that he could play with immutable structures. </div><div>But we will see if he will get a grant. </div><div>Stef</div><div><br></div><div><div><div>On 21 Sep 2015, at 15:41, Eliot Miranda <<a href="mailto:eliot.miranda@gmail.com">eliot.miranda@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">Hi Stef,<br><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Sep 20, 2015 at 11:51 AM, stepharo <span dir="ltr"><<a href="mailto:stepharo@free.fr" target="_blank">stepharo@free.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><br>
Hi eliot<br>
<br>
I thought that with Spur we could start to take advantages of the immutability bit. Now what is special with literals?<br>
We could have ImmutableString ImmutableSymbol? (I know that immutability is the instance level but may be the class should get impacted too).<br></blockquote><div><br></div><div>In my experience the special class approach doesn't work well. I tried it with BrouHaHa way back in the 80's; the BrouHaHa VM didn't support immutability, but one could make immutable literals rather like Symbol being almost immutable now. Instead, the compiler simply uses the immutability bit to mark the literals in a method as immutable, and just uses the normal classes for literals. This is the approach we took in VisualWorks and it works well.</div><div><br></div><div><br></div><div>But note that code that wants to use literals as the starting point for building a mutable collection, e.g.</div><div><br></div><div> (WriteStream on: 'Name: ') setToEnd; nextPutAll: name</div><div><br></div><div>needs to be rewritten (with either scheme) as e.g.</div><div><br></div><div> (WriteStream on: 'Name: ' copy) setToEnd; nextPutAll: name</div><div><br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Stef<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><span style="font-size:small;border-collapse:separate"><div>_,,,^..^,,,_<br></div><div>best, Eliot</div></span></div></div></div>
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