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.error { color:#AA0000; }</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="bloop_markdown"><p>–1</p>
<p>We don’t have this behaviour with functions, so there is no need for that on enum cases. Something like this should be some point of the API Design Guideline instead. </p>
<p>Sometimes there is just no need for an extra label on an enum case with assocaited values.</p>
<p></p></div><div class="bloop_original_html"><style>body{font-family:Helvetica,Arial;font-size:13px}</style><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div> <br> <div id="bloop_sign_1480512369363723008" class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <br><p class="airmail_on">Am 30. November 2016 um 14:11:55, Steve Prescott via swift-evolution (<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div></div><div>
<title></title>
<div class="">As the original poster of this thread, I wanted to
re-state the original question:</div>
<div class=""><br class=""></div>
<div class="">Should enums REQUIRE parameter names?</div>
<div class=""><br class=""></div>
<div class="">Pro: The syntax would more closely match that for
functions, which requires names for all parameters (unless you say
“_”) vs. the current syntax that is sort of C-like.</div>
<div class="">Con: More verbose</div>
<div class=""><br class=""></div>
<div class="">With this suggestion, your declaration of a variable
that uses an enum would resemble calling a function.
e.g.:</div>
<div class=""><br class=""></div>
<div class="">var myTeam = Team.football (name: “Redskins”, city:
“Washington, DC”, quarterback: “Kirk Cousins”)</div>
<div class=""><br class=""></div>
<div class=""><br class=""></div>
<div class=""><br class=""></div>
<br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Nov 30, 2016, at 5:14 AM, Adrian Zubarev via
swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
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<p style="margin: 15px 0px; -webkit-margin-before: 0px;" class="">
Fair point, the more and more I’m thinking about default values,
the more I’m convinced here.</p>
<p style="margin: 15px 0px;" class="">And yes, as I mentioned
before, default value would solve the problem in my API. I’m
thinking of adapting the pitched idea so I almost get the right
behaviour for free when Swift 4 drops.</p>
<div style="margin: 15px 0px;" class=""><br class="webkit-block-placeholder"></div>
</div>
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<br class="">
<div id="bloop_sign_1480500747365548032" class="bloop_sign">
<div style="font-family: helvetica, arial; font-size: 13px;" class="">-- <br class="">
Adrian Zubarev<br class="">
Sent with Airmail</div>
</div>
<br class="">
<p class="airmail_on" style="margin: 15px 0px;">Am 30. November
2016 um 04:32:17, Karl (<a href="mailto:razielim@gmail.com" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;" class="">razielim@gmail.com</a>) schrieb:</p>
<blockquote type="cite" class="clean_bq" style="margin: 15px 0px;">
<div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
<div class=""></div>
<div class=""><span style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></span>
<div class="">
<blockquote type="cite" class="" style="margin: 15px 0px;">
<div class="" style="margin-top: 0px;"><span style="margin-top: 0px; margin-bottom: 0px;" class="">On 29 Nov 2016, at
18:41, Tony Allevato via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">swift-evolution@swift.org</a>>
wrote:</span></div>
<span style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="Apple-interchange-newline"></span>
<div class="" style="margin-bottom: 0px;">
<div dir="ltr" class=""><span style="margin-top: 0px; margin-bottom: 0px;" class="">Default values and
overloaded cases don't (and in fact, shouldn't) be
conflated.</span>
<div class=""><span style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></span></div>
<div class=""><span style="margin-top: 0px; margin-bottom: 0px;" class="">I support default values for associated values but I'm not
yet ready to say I'm in favor of overloaded cases. There's no
ambiguity because your Value.number example can't exist without
overloads, and default values don't create parameter lists that
could mismatch like that (there's still only one case, and it has
all of the associated values regardless of how many you specify at
the time you create it).</span></div>
<div class=""><span style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></span></div>
<div class=""><span style="margin-top: 0px; margin-bottom: 0px;" class="">Small self-contained examples like Value are nice, but
entirely hypothetical and a bit contrived. "Maybe the design of the
API does not want something" is difficult to convince me—I'd prefer
to see a significant real world situation where it's vital to have
two cases with the same name with differently typed payloads, which
can't be expressed in a different way. For example, in your
Javascript example, I think the optionality of that Document would
be far better expressed as an Optional<Document> with a
default value of nil than creating an overload, and that solution
introduces far less complexity to the language than would
introducing arbitrary overloads.</span></div>
</div>
</div>
</blockquote>
<span style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></span></div>
<div class=""><span style="margin-top: 0px; margin-bottom: 0px;" class="">Yeah, we shouldn’t confuse these issues. Default values
for enum payloads are something I also really want (in Swift 4
phase 2). Here’s my use-case:</span></div>
<div class=""><span style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></span></div>
<div class="">
<pre class="" style="margin: 0px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 13.600000381469727px; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(247, 247, 247); color: rgb(51, 51, 51); border: 1px solid rgb(204, 204, 204); overflow: auto; padding: 16px; word-break: normal; word-wrap: normal; box-sizing: border-box; line-height: 1.45;"><span style="margin-top: 0px; margin-bottom: 0px;" class=""><span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">public</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">enum</span> <span class="pl-en" style="box-sizing: border-box; color: rgb(121, 93, 163);">ReadError</span> : <span class="pl-e" style="box-sizing: border-box; color: rgb(121, 93, 163);"><span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">Error</span> </span>{
<span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">case</span> <span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">otherError</span>(<span class="pl-en" style="box-sizing: border-box; color: rgb(121, 93, 163);"><span class="pl-smi" style="box-sizing: border-box; color: rgb(51, 51, 51);">description</span></span>: <span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">String</span>, <span class="pl-en" style="box-sizing: border-box; color: rgb(121, 93, 163);"><span class="pl-smi" style="box-sizing: border-box; color: rgb(51, 51, 51);">location</span></span>: <span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">StaticString</span><span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">?</span> = #function) <span class="pl-c" style="box-sizing: border-box; color: rgb(150, 152, 150);">// <- currently an error, tuples can't have default values</span>
}</span></pre>
<div class=""><br class=""></div>
</div>
<div class="">And yes, you can use #function as a default
value:</div>
<div class=""><br class=""></div>
<blockquote class="" style="margin: 0px 0px 0px 40px; border: none; padding: 0px;">
<div class="" style="margin-top: 0px;"><font face="Courier" class="">func doIt(_ str: String = #function) {</font></div>
<div class=""><font face="Courier" class=""> print("Called
from \(str)") </font></div>
<div class=""><font face="Courier" class="">}</font></div>
<div class=""><font face="Courier" class="">func myFunc() { doIt()
}</font></div>
<div class=""><font face="Courier" class=""><br class=""></font></div>
<div class=""><font face="Courier" class="">doIt() //
Prints “Called from __lldb_expr_1” in REPL</font></div>
<div class=""><font face="Courier" class="">myFunc() //
Prints “Called from myFunc()”</font></div>
<div class="" style="margin-bottom: 0px;"><font face="Courier" class=""><br class=""></font></div>
</blockquote>
<div class=""><br class=""></div>
I think that’s a more valuable use-case than overloaded values; so
if they’re incompatible and we have to choose one, I’d go for
default values.
<div class=""><br class=""></div>
<div class="">- Karl</div>
</div>
</div>
</blockquote>
</div>
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