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<p>Hi Eliot,</p>
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<p>I'm not deep in this stuff, but I always try to keep maximum flexibility in terms of polymorphy when designing any interface in Squeak. Thus my naive choice would be option 3, <span>ignore it and hope the user knows what they're doing. Using of #isKindOf:
etc. often can lead to problems, for example, imagine an association being wrapped within a proxy or an ObjectTracer ... </span><span style="font-size: 12pt;">Just my 2 cents :)</span></p>
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<p><span style="font-size: 12pt;">Best,</span></p>
<p><span style="font-size: 12pt;">Christoph</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Von:</b> Squeak-dev <squeak-dev-bounces@lists.squeakfoundation.org> im Auftrag von Eliot Miranda <eliot.miranda@gmail.com><br>
<b>Gesendet:</b> Donnerstag, 1. Oktober 2020 19:44:46<br>
<b>An:</b> The general-purpose Squeak developers list<br>
<b>Betreff:</b> [squeak-dev] Ephemerons and Dictionaries</font>
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<div class="gmail_default" style="font-size:large">Hi All,</div>
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<div class="gmail_default"><font size="4"> to be able to ease </font>EphemeronDicitonary<font size="4"> into the system easily I'd like to clean up adding associations to Dictionary. It seems to me there's a partial implementation of choosing an association
class appropriate for a dictionary in the </font>implementors<font size="4"> of associationClass: Dictionary>>#associationClass, WeakKeyDictionary>>#associationClass, WeakValueDictionary>>#associationClass, (& in my image STON class>>#associationClass). This
seems workable; an EphemeronDictionary would simply add </font><span style="font-size:medium;color:rgb(0,0,0);font-family:-webkit-standard">associationClass ^ Ephemeron</span><span style="color:rgb(0,0,0)"><font face="arial, sans-serif">
<font size="4">and we're done, except not quite...</font></font></span></div>
<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4"><br>
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<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4">First, HashedCollection does not use associationClass, but it implements atNewIndex:put: and it strikes me that atNewIndex:put: for Dictionary really should
check for the thing being added at least includingBehavior: self associationClass. So that means Dictionary should override atNewIndex:put:.</font></font></span></div>
<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4"><br>
</font></font></span></div>
<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4">But what should happen in atNewIndex:put: if the object being added isn't appropriate? Do we</font></font></span></div>
<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4">- raise an error? (that's my preference, but I've got limited use cases in my head)</font></font></span></div>
<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4">- replace the association with one of assocationClass? (seems dangerous to me but maybe someone needs this or the existing system does this anyway)</font></font></span></div>
<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4">- ignore it and hope the user knows what they're doing?</font></font></span></div>
<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4"><br>
</font></font></span></div>
<div class="gmail_default"><span style="color:rgb(0,0,0)"><font face="arial, sans-serif"><font size="4"><br>
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<div>_,,,^..^,,,_<br>
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<div>best, Eliot</div>
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