<html><head><style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
padding:1em;
margin:auto;
background:#fefefe;
}
h1, h2, h3, h4, h5, h6 {
font-weight: bold;
}
h1 {
color: #000000;
font-size: 28pt;
}
h2 {
border-bottom: 1px solid #CCCCCC;
color: #000000;
font-size: 24px;
}
h3 {
font-size: 18px;
}
h4 {
font-size: 16px;
}
h5 {
font-size: 14px;
}
h6 {
color: #777777;
background-color: inherit;
font-size: 14px;
}
hr {
height: 0.2em;
border: 0;
color: #CCCCCC;
background-color: #CCCCCC;
display: inherit;
}
p, blockquote, ul, ol, dl, li, table, pre {
margin: 15px 0;
}
a, a:visited {
color: #4183C4;
background-color: inherit;
text-decoration: none;
}
#message {
border-radius: 6px;
border: 1px solid #ccc;
display:block;
width:100%;
height:60px;
margin:6px 0px;
}
button, #ws {
font-size: 12 pt;
padding: 4px 6px;
border-radius: 5px;
border: 1px solid #bbb;
background-color: #eee;
}
code, pre, #ws, #message {
font-family: Monaco;
font-size: 10pt;
border-radius: 3px;
background-color: #F8F8F8;
color: inherit;
}
code {
border: 1px solid #EAEAEA;
margin: 0 2px;
padding: 0 5px;
}
pre {
border: 1px solid #CCCCCC;
overflow: auto;
padding: 4px 8px;
}
pre > code {
border: 0;
margin: 0;
padding: 0;
}
#ws { background-color: #f8f8f8; }
.bloop_markdown table {
border-collapse: collapse;
font-family: Helvetica, arial, freesans, clean, sans-serif;
color: rgb(51, 51, 51);
font-size: 15px; line-height: 25px;
padding: 0; }
.bloop_markdown table tr {
border-top: 1px solid #cccccc;
background-color: white;
margin: 0;
padding: 0; }
.bloop_markdown table tr:nth-child(2n) {
background-color: #f8f8f8; }
.bloop_markdown table tr th {
font-weight: bold;
border: 1px solid #cccccc;
margin: 0;
padding: 6px 13px; }
.bloop_markdown table tr td {
border: 1px solid #cccccc;
margin: 0;
padding: 6px 13px; }
.bloop_markdown table tr th :first-child, table tr td :first-child {
margin-top: 0; }
.bloop_markdown table tr th :last-child, table tr td :last-child {
margin-bottom: 0; }
.bloop_markdown blockquote{
border-left: 4px solid #dddddd;
padding: 0 15px;
color: #777777; }
blockquote > :first-child {
margin-top: 0; }
blockquote > :last-child {
margin-bottom: 0; }
code, pre, #ws, #message {
word-break: normal;
word-wrap: normal;
}
hr {
display: inherit;
}
.bloop_markdown :first-child {
-webkit-margin-before: 0;
}
code, pre, #ws, #message {
font-family: Menlo, Consolas, Liberation Mono, Courier, monospace;
}
.send { color:#77bb77; }
.server { color:#7799bb; }
.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>To which code ‘above’ do you refer exactly?</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_1480795002249061120" 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 3. Dezember 2016 um 20:29:05, Xiaodi Wu (<a href="mailto:xiaodi.wu@gmail.com">xiaodi.wu@gmail.com</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>
<title></title>
<div dir="ltr">On Sat, Dec 3, 2016 at 12:02 PM, Daniel Leping via
swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">@Adrian, my comments inline below. Hope this
helps.<br>
<div class="gmail_extra"><br>
<div class="gmail_quote"><span class="">On Sat, Dec 3, 2016 at 6:22
PM, Adrian Zubarev <span dir="ltr"><<a href="mailto:adrian.zubarev@devandartist.com" target="_blank">adrian.zubarev@devandartist.<wbr>com</a>></span>
wrote:<br></span>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_markdown">
<p>There is one thing that I want to point out with pitched
syntactic sugar. <code>GenericMyProtocolName<U></code> will
also let you reuse <code>T</code> within a generic type, where
currently we cannot nest protocols into types. Even if we could,
it’s not clear if nested declarations like <code>protocol
MyTProtocolName : MyProtocolName where U == T</code> would be
possible, so that <code>T</code> from the outer generic type is
accessible.</p>
<p>Autogenerating the only possible generic protocols from
protocols with associated types as a syntactic sugar to reduce
spawning of types like <code>IntFoo</code> (as previously showed)
seems reasonable to me. It does not break the current protocol
system, but solves the first generic protocol feature from the
generics manifesto.</p>
<p>There are still a few more questioned to answer:</p>
<ul>
<li>How dow we want the generated parameter list to look like?</li>
</ul>
</div>
</div>
</blockquote>
<div> The most obvious thing is to do something like
Foo<Alias1 = Int, Alias2 = String>. Otherwise we'll have to
add some sort of associatedtype sorting before; which doesn't sound
good and just adds more complexity. Any other options?</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_markdown">
<ul>
<li><span class="">Can we drop <code>Generic</code> prefix without
collisions?</span></li>
</ul>
</div>
</div>
</blockquote>
<div>I'm pretty sure we could just use existing protocols. All the
namings can be compiler generated as a function from protocol and
arguments.</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_markdown">
<ul>
<li><span class="">Does this syntactic sugar improves the stdlib or
affect ABI?</span></li>
</ul>
</div>
</div>
</blockquote>
<div>Don't see any implications. Assuming current stdlib doesn't
use the feature. It's rather an addition than change.</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_markdown">
<p><span class="">There are probably some more questions I cannot
foresee by myself. Feel free to jump in the discussion.
;)</span></p>
<p><span class="">PS: Yes this syntactic sugar does create an
alternative way of creating ‘kinda’ the same protocol twice, but it
reuses the pattern more naturally.</span></p>
<pre><span class=""><code class="m_-6431036212696460543gmail-m_805315748064065134swift">protocol Foo { associatetype Inner : SomeOtherProtocol }
// Assuming String and Int conforms to SomeOtherProtocol
protocol StringFoo : Foo where Inner == String {}
protocol IntFoo : Foo where Inner == Int {}</code></span></pre></div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
<div><br></div>
<div>I thought I understood the initial topic of discussion, but I
am lost here. What is unsatisfactory about the code you wrote above
and why do we need new sugar for it?</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_markdown">
<pre><span class=""><code class="m_-6431036212696460543gmail-m_805315748064065134swift">// VS.
// autogenerated
procotol GenericFoo<Inner : SomeOtherProtocol> : Foo { … }
// usage
GenericFoo<String>
GenericFoo<Int>
// or
typealias StringFoo = GenericFoo<String>
typealias IntFoo = GenericFoo<Int></code></span></pre></div>
</div>
</blockquote>
<div>// The usage I propose is just do</div>
<div>typealias StringFoo = Foo<Inner = String></div>
<div><br></div>
<div>//also in an inheritance like this:</div>
<div>class FooClass : Foo<Inner = String>, Foo<Inner =
Int> {</div>
<div>//My question here is, though: how do we access Inner from
FooClass<br></div>
<div><br></div>
<div>//Like this?</div>
<div>typealias InnerInt = Foo<Inner = String>.Inner</div>
<div><span class="">}</span></div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_markdown">
<pre><span class=""> </span></pre></div>
</div>
</blockquote>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="word-wrap:break-word">
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_markdown">
<pre><span class=""><code class="m_-6431036212696460543gmail-m_805315748064065134swift">
</code></span></pre></div>
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_original_html">
<div id="m_-6431036212696460543gmail-m_805315748064065134bloop_customfont" style="font-family:helvetica,arial;font-size:13px;color:rgb(0,0,0);margin:0px">
<span class=""><br></span></div>
<span class=""><br></span>
<div id="m_-6431036212696460543gmail-m_805315748064065134bloop_sign_1480780772434896896" class="m_-6431036212696460543gmail-m_805315748064065134bloop_sign">
<div style="font-family:helvetica,arial;font-size:13px">
<span class="">-- <br>
Adrian Zubarev<br>
Sent with Airmail</span></div>
</div>
<span class=""><br></span>
<div>
<div class="m_-6431036212696460543gmail-h5">
<p class="m_-6431036212696460543gmail-m_805315748064065134airmail_on">Am 3.
Dezember 2016 um 16:43:43, Daniel Leping (<a href="mailto:daniel@crossroadlabs.xyz" target="_blank">daniel@crossroadlabs.xyz</a>) schrieb:</p>
<blockquote type="cite" class="m_-6431036212696460543gmail-m_805315748064065134clean_bq">
<div>
<div>
<div style="white-space:pre-wrap"><span>In general I'm very
positive with the idea of generic protocols. This discussion is
more about syntactic sugar, though I really like where it
goes.<br>
<br>
Off topic:<br>
IMO, we should revisit approaches others already use for conflicts
resolution. I personally tend to get something similar to Scala
traits. Should fit POT smoothly and naturally.</span></div>
<span><br></span>
<div class="gmail_quote">
<div dir="ltr"><span>On Sat, 3 Dec 2016 at 16:30 Adrian Zubarev
<<a href="mailto:adrian.zubarev@devandartist.com" target="_blank">adrian.zubarev@devandartist.c<wbr>om</a>>
wrote:<br></span></div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div style="word-wrap:break-word" class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<div class="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282bloop_markdown m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<p class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<span>If I’m not mistaken here, <code class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">extension
Foo where T == Int</code> will have an error of redeclaration
<code class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">foo</code>
anyways.</span></p>
<p class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg"></p>
</div>
<div class="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282bloop_original_html m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
</div>
</div>
<div style="word-wrap:break-word" class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<div class="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282bloop_original_html m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<div id="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282bloop_customfont" style="font-family:helvetica,arial;font-size:13px;color:rgb(0,0,0);margin:0px" class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<span><br class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg"></span></div>
<div id="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282bloop_sign_1480775153794472960" class="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282bloop_sign m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<div style="font-family:helvetica,arial;font-size:13px" class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<span>-- <br class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
Adrian Zubarev<br class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
Sent with Airmail</span></div>
</div>
<span><br class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg"></span></div>
</div>
<div style="word-wrap:break-word" class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<div class="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282bloop_original_html m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<p class="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282airmail_on m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<span>Am 3. Dezember 2016 um 15:22:56, Adrian Zubarev (<a href="mailto:adrian.zubarev@devandartist.com" class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg" target="_blank">adrian.zubarev@devandartist.c<wbr>om</a>)
schrieb:</span></p>
<blockquote type="cite" class="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282clean_bq m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<div class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg">
<pre style="margin:15px 0px;font-family:menlo,consolas,"liberation mono",courier,monospace;font-size:10pt;border-radius:3px;background-color:rgb(248,248,248);color:rgb(0,0,0);border:1px solid rgb(204,204,204);overflow:auto;padding:4px 8px;word-break:normal;word-wrap:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px" class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg"><span><span class="m_-6431036212696460543gmail-m_805315748064065134gmail_msg"><code class="m_-6431036212696460543gmail-m_805315748064065134m_6921161786416199282swift m_-6431036212696460543gmail-m_805315748064065134gmail_msg" style="font-family:menlo,consolas,"liberation mono",courier,monospace;font-size:10pt;border-radius:3px;background-color:rgb(248,248,248);color:inherit;border:0px;margin:0px;padding:0px;word-break:normal;word-wrap:normal">extension Foo where T == Int {
func foo() {
self.bar(o: 42) // calls a function that accepts an Int
}
}</code></span></span></pre></div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
<div class="m_-6431036212696460543gmail-m_805315748064065134bloop_markdown">
</div>
</div>
</blockquote>
</div>
<br></div>
</div>
<br>
______________________________<wbr>_________________<br>
swift-evolution mailing list<br>
<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a><br>
<a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" target="_blank">https://lists.swift.org/<wbr>mailman/listinfo/swift-<wbr>evolution</a><br>
<br></blockquote>
</div>
<br></div>
</div>
</div></div></span></blockquote></div><div class="bloop_markdown"><p></p></div></body></html>