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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi, all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">I just tested it with C#, with different results:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Using the dynamic keyword, it seems that C# using “dynamic” does not honor the optional parameter in any “inherited” case, it only works when the method implementation
also provides the default parameter. </span><span lang="EN-US" style="font-size:10.0pt;font-family:Wingdings">L</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">This closely matches the behavior of the “normal” C# compiler, which delivers compiler errors in those cases – it works when I either have the interface or ABC
as type, or the method implementation also has the default parameter declared. It also chooses the default value depending on the variable type.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Thus, it seems that C# is even more restrictive than IronPython right now, at least when the “dynamic” keyword is used.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Just as a side note, we successfully worked around the problem in our use case, so there is no urgent fix necessary, it was more some kind of curiosity of which
semantics are considered “correct”. As changing anything might be a breaking change, I suggest we apply it only in 3.x (in case we fix anything).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">The output of the extended, attached example is:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">InternalImpl:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Internal: Param: 1 Text: mit text<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Internal: Param: 2 Text: <defaultItf><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Internal: Param: 11 Text: See Sharp!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">Keine Überladung für die DoSomething-Methode nimmt 1-Argumente an.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Internal: Param: 21 Text: <defaultItf><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicImpl:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Public: Param: 1 Text: mit text<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">DoSomething() takes exactly 2 arguments (1 given)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Public: Param: 11 Text: See Sharp!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">Keine Überladung für die DoSomething-Methode nimmt 1-Argumente an.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">Public: Param: 21 Text: <defaultItf><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicImplWithDefault:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicDefault: Param: 1 Text: mit text<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicDefault: Param: 2 Text: <defaultImpl><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicDefault: Param: 11 Text: See Sharp!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicDefault: Param: 12 Text: <defaultImpl><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicDefault: Param: 21 Text: <defaultItf><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicDefault: Param: 24 Text: <defaultImpl><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicDefault: Param: 28 Text: <defaultImpl><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicAbcInternalImpl:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">InternalABC: Param: 1 Text: mit text<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">InternalABC: Param: 2 Text: <defaultABC><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">InternalABC: Param: 11 Text: See Sharp!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">Keine Überladung für die DoSomething-Methode nimmt 1-Argumente an.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">InternalABC: Param: 25 Text: <defaultABC><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicAbcPublicImpl:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicABC: Param: 1 Text: mit text<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">DoSomething() takes exactly 2 arguments (1 given)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicABC: Param: 11 Text: See Sharp!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">Keine Überladung für die DoSomething-Methode nimmt 1-Argumente an.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicABC: Param: 25 Text: <defaultABC><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicAbcPublicImplWithDefault:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicABC: Param: 1 Text: mit text<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicABC: Param: 2 Text: <defaultImpl><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicABC: Param: 11 Text: See Sharp!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicABC: Param: 12 Text: <defaultImpl><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">PublicABC: Param: 25 Text: <defaultABC><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Best regards<br>
<br>
Markus Schaber</span><span lang="EN-US"><br>
<br>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#636363">3S-Smart Software Solutions GmbH
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Dipl.-Inf. Markus Schaber | Product Development Core Technology <br>
Memminger Str. 151 | 87439 Kempten | Germany <br>
Tel. +49-831-54031-979 | Fax +49-831-54031-50 <br>
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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""> Slide [mailto:slide.o.mix@gmail.com]
<br>
<b>Sent:</b> Tuesday, August 30, 2016 12:09 PM<br>
<b>To:</b> Markus Schaber; Discussion of IronPython<br>
<b>Subject:</b> Re: [Ironpython-users] Binding problem with default parameters in public classes<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>I can see this both ways (bug and not a bug), so let's err on the side of bug and see if we can make the behaviour match C#.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Mon, Aug 29, 2016, 23:53 Markus Schaber <<a href="mailto:m.schaber@codesys.com">m.schaber@codesys.com</a>> wrote:<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:10.0pt;font-family:"Arial","sans-serif"">Hi, Slide,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Using a public abstract base class produces the same result: If the derived class is internal, the call
works fine, if the derived class is public, the call does not work.</span><o:p></o:p></p>
</div>
</div>
<div>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Best regards<br>
<br>
Markus Schaber</span><span lang="EN-US"><br>
<br>
</span><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#636363">CODESYS<sup>®</sup></span></b><span lang="EN-US">
</span><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#B1B2B3">a trademark of 3S-Smart Software Solutions GmbH</span><span lang="EN-US">
<br>
</span><b><span lang="EN-US" style="font-size:2.0pt;font-family:"Arial","sans-serif";color:#636363"><br>
</span></b><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#636363">Inspiring Automation Solutions
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#636363">3S-Smart Software Solutions GmbH
<br>
Dipl.-Inf. Markus Schaber | Product Development Core Technology <br>
Memminger Str. 151 | 87439 Kempten | Germany <br>
Tel. +49-831-54031-979 | Fax +49-831-54031-50 <br>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#636363">This e-mail may contain confidential and/or privileged information. If you are not the
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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;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Slide [mailto:<a href="mailto:slide.o.mix@gmail.com" target="_blank">slide.o.mix@gmail.com</a>]
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<b>Sent:</b> Monday, August 29, 2016 4:24 PM<br>
<b>To:</b> Markus Schaber; Discussion of IronPython<br>
<b>Subject:</b> Re: [Ironpython-users] Binding problem with default parameters in public classes</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>What happens if it's an abstract base class instead of an interface?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Mon, Aug 29, 2016, 03:25 Markus Schaber <<a href="mailto:m.schaber@codesys.com" target="_blank">m.schaber@codesys.com</a>> wrote:<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:10.0pt;font-family:"Arial","sans-serif"">Hi,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Our tests recently caught a strange regression in our application. One can make existing scripts fail
by changing an internal class to public.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">The attached program reproduces the issue. The problem is that the method has optional parameters, but
those are only declared at the interface.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Now, when the class changes from “internal” to “public”, IronPython binds directly to the public methods
without considering the interfaces any more, and thus does not recognize the optional parameters.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Now, the question is whether this could be considered a bug in IronPython, or whether it should be considered
a bug to implement an interface method without replicating the default parameter values…</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
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<br>
Markus Schaber</span><span lang="EN-US"><br>
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