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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">That probably won’t happen – I think we may have tried that with Java at one point in time
</span><span style="font-size:11.0pt;font-family:
Wingdings;color:#1F497D">J</span><span style="font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com]
<b>On Behalf Of </b>mlkjih mlkjih<br>
<b>Sent:</b> Monday, August 09, 2010 11:31 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] Similarity with builtin types<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">What about some sort of switcher to enable ironpython specific features?<br>
<br>
import allow_builtin_type_extensions<o:p></o:p></p>
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<p class="MsoNormal">2010/8/9 Dino Viehland <<a href="mailto:dinov@microsoft.com">dinov@microsoft.com</a>><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">Because you can’t do that in CPython. If we enabled that we’d certainly instantly start failing a number of tests and we might subtly
break compatibility of libraries that might try do assign, catch a TypeError/AttributeError, and then do something else (even if that sounds like a terrible idea).</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">I also think it’s nicer to be explicit here that you’re doing something which requires IronPython by forcing the “import clr” so that
it’s clearer this code won’t work on CPython.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt">From:</span></b><span style="font-size:10.0pt">
<a href="mailto:users-bounces@lists.ironpython.com" target="_self">users-bounces@lists.ironpython.com</a> [mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_self">users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>mlkjih mlkjih<br>
<b>Sent:</b> Monday, August 09, 2010 10:58 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] Similarity with builtin types</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">><span style="font-size:11.0pt;color:#1F497D">We won’t ever support Ruby’s mutation of everything under the sun including built-in types simply because that’s not something CPython supports.</span><br>
<span style="font-size:11.0pt;color:#1F497D"><br>
With clr.LoadClrExtensions using C# extension methods we can extend builtin types,<br>
public string DoSomething(this string str) ...<br>
so why not just allow use ironpython for this?<br>
String.DoSomething = ...</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">2010/8/9 Dino Viehland <<a href="mailto:dinov@microsoft.com" target="_self">dinov@microsoft.com</a>><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">As far as extension methods go – and just extension methods – we may at some point in time support them. We won’t ever support Ruby’s
mutation of everything under the sun including built-in types simply because that’s not something CPython supports.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">The tricky part w/ the extension methods is doing it in a way which is per-module instead of at a global scope. In Ruby so much code
mutates object that it’s not really a big deal to add in some more mutation of types across the system. But w/ Python these sort of changes have always been more closely scoped – for example look at from __future__ import … which effects only the current
module. Another example is our own “import clr” which makes .NET attributes available on the built-in types.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">I suspect what we’ll end up doing is something like:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">clr.LoadClrExtensions(namespace)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">So it’d end up looking like:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">import System</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">Import clr</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">clr.AddReference(System.Linq)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">I do want to do something to continue to push LINQ forward for 2.7 and maybe this will be it if I can get it in… Tomas added the metadata
reader which we can use to efficiently get the extension methods and I think I might have an idea on how to efficiently share the extension methods across modules.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D">So I guess the question now would be does that look like a reasonable way to load extension methods?
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt">From:</span></b><span style="font-size:10.0pt">
<a href="mailto:users-bounces@lists.ironpython.com" target="_self">users-bounces@lists.ironpython.com</a> [mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_self">users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>mlkjih mlkjih<br>
<b>Sent:</b> Monday, August 09, 2010 9:10 AM<br>
<b>To:</b> <a href="mailto:users@lists.ironpython.com" target="_self">users@lists.ironpython.com</a><br>
<b>Subject:</b> [IronPython] Similarity with builtin types</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="http://ironpython.net/documentation/dotnet/dotnet.html#similarity-with-builtin-types" target="_self">http://ironpython.net/documentation/dotnet/dotnet.html#similarity-with-builtin-types</a><br>
What's the point? Is there any plans to support extension methods, something like IronRuby's
<i>using_clr_extensions? With immutable types it cannot be done, am I right?</i><o:p></o:p></p>
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