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.send { color:#77bb77; }
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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>Hi Anton and welcome back to the discussion. :)</p>
<p>While trying to find the talk about overlapping protocol members from different protocols I spotted your proposal: <a href="https://github.com/Anton3/swift-evolution/blob/generic-protocols/proposals/NNNN-generic-protocols.md">https://github.com/Anton3/swift-evolution/blob/generic-protocols/proposals/NNNN-generic-protocols.md</a> </p>
<p>Just one hint, inside an extension or a type (non-protocol) we write <code>typealias</code> instead of <code>associatedtype</code>.</p>
<p>Here is the evolution-thread: <a href="https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160919/027122.html">https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon–20160919/027122.html</a></p>
<p>The suggestion there was to prefix everything with the corresponding protocol when there is a collision.</p>
<pre><code class="swift">struct Test : Foo<Int>, Foo<String> {
init(_ value: Foo<Int>.Value) { … } // or better: init(_ value: Int)
init(_ value: Foo<String>.Value) { … } // init(_ value: String)
// assume both had the function `foo()`
func Foo<Int>.foo() { … }
func Foo<String>.foo() { … }
}
</code></pre>
<p>Is there really a need for true generic protocols? I’m still fascinated by the idea how a generic and constrained <code>typealias</code> could create this new ‘pseudo’ generic protocol.</p>
<pre><code class="swift">protocol Foo {
associatedtype Value
init(_ value: Value)
func foo()
}
typealias GenericFoo<T> = Foo where Value == T
struct OtherTest : GenericFoo<Int>, GenericFoo<String> {
init(_ value: Int) { … }
init(_ value: String) { … }
func GenericFoo<Int>.foo() { … }
func GenericFoo<String>.foo() { … }
}
</code></pre>
<p>But allowing this kind of <code>typealias</code> probably means that one would in general allow the where clause on any protocol anywhere in the language. :/ Or I might be totally wrong at this point.</p>
<p>Again, one cool thing is that this would also define some best practice of how we could use existentials.</p>
<p><code>typealias</code> + <code>non-/generic type name</code> + <code>=</code> <code>protocol/class</code> + optional N * (<code>&</code> + <code>protocol</code>) + optional <code>where clause</code></p>
<p>That pattern is more reusable then the strict <code>Any< … ></code> would be.</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_1481358003916872960" 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 9. Dezember 2016 um 20:16:14, Anton Zhilin (<a href="mailto:antonyzhilin@gmail.com">antonyzhilin@gmail.com</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>
<title></title>
<div dir="ltr">
<div class="markdown-here-wrapper" style="">
<p style="margin:0px 0px 1.2em!important">A fundamental problem is,
how do we get rid of <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
associatedtype</code> duplicates?</p>
<p style="margin:0px 0px 1.2em!important">A pedantic approach is to
add trait operations for conformances:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-swift" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">protocol</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Constructible</span> </span>{
associatedtype <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Value</span>
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(<span class="hljs-number" style="color:rgb(0,128,128)">_</span> value: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Value</span>)
}
<span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">struct</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">MyStruct</span> </span>{
conformance <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Constructible</span> {
rename associatedtype <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">ValueInt</span> = <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Value</span>
}
conformance <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Constructible</span> {
rename associatedtype <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">ValueString</span> = <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Value</span>
}
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">typealias</span> <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">ValueInt</span> = <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Int</span> <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// or can be inferred</span>
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(<span class="hljs-number" style="color:rgb(0,128,128)">_</span> value: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Int</span>)
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">typealias</span> <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">ValueString</span> = <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">String</span> <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// or can be inferred</span>
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(<span class="hljs-number" style="color:rgb(0,128,128)">_</span> value: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">String</span>)
}
</code></pre>
<p style="margin:0px 0px 1.2em!important">This way, if there is a
if there is a conflicting member, which does not use any of the
associated types, like <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
func foo()</code>, then we can give it different meanings in
different conformances.<br>
Although this approach is the most clean one from theoreticall
point of view, choosing different names for associated types would
not look very good in practise.</p>
<p style="margin:0px 0px 1.2em!important">One possible solution is
to <em>always</em> automatically match <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
associatedtype</code>s, without using <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
typealias</code>es.</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-swift" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">protocol</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">ConstructibleFromBoth</span> </span>{
associatedtype <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">First</span>
associatedtype <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Second</span>
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(first: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">First</span>)
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(second: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Second</span>)
}
<span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">struct</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">MyStruct</span> : <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">ConstructibleFromBoth</span> </span>{
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(first: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Int</span>)
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(second: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Double</span>)
}
<span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">extension</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">MyStruct</span> </span>{
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(first: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">String</span>) <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// now there are 2 distinct conformances</span>
}
<span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">extension</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">MyStruct</span> </span>{
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(second: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Float</span>) <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// now there are 4 distinct conformances</span>
}
</code></pre>
<p style="margin:0px 0px 1.2em!important">It introduces another
potentially exponential algorithm for compiler. Although, does it?
During a conformance test in some generic function, compiler will
need to only find the first match or two.<br>
Anyway, I guess, people would prefer to state explicitly that a
type conforms to multiple versions of a protocol.</p>
<p style="margin:0px 0px 1.2em!important">Attempt #3. We can
resolve the conflict between associated types, if we delete (if
trait sense) confliting associated types from the type. But with
extensions, all associated types can be made conflicting. So there
needs to be some attribute, marking, which of the associated types
we don’t want. It can lie at the place of conformance:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-swift" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">struct</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">MyStruct</span> </span>{ }
<span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">extension</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">MyStruct</span> : @<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">dontCreateTypealiases</span> (<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Constructible</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">where</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Value</span> == <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Int</span>) </span>{ ... }
<span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">extension</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">MyStruct</span> : @<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">dontCreateTypealiases</span> (<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Constructible</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">where</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Value</span> == <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">String</span>) </span>{ ... }
<span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// MyStruct.Value.self // error, no such type</span>
<span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">struct</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">NormalConformanceTest</span> : <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Constructible</span> </span>{ <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(<span class="hljs-number" style="color:rgb(0,128,128)">_</span> value: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Float</span>) }
<span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">NormalConformanceTest</span>.<span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Value</span>.<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">self</span> <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">//=> Float</span>
</code></pre>
<p style="margin:0px 0px 1.2em!important">Or we can let constrained
protocols syntax carry this attribute by default:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-swift" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">extension</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">MyStruct</span> : (<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Constructible</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">where</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Value</span> == <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Int</span>) </span>{ ... }
<span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// MyStruct.Value.self // error, no such type</span>
<span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">struct</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">NormalConformanceTest</span>: <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Constructible</span> </span>{ <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">init</span>(<span class="hljs-number" style="color:rgb(0,128,128)">_</span> value: <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Float</span>) }
<span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">NormalConformanceTest</span>.<span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Value</span>.<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">self</span> <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">//=> Float</span>
</code></pre>
<p style="margin:0px 0px 1.2em!important">The only thing left to
solve is generic protocol declaration syntax and protocol
specialization syntax. I’d like to present two ways to do this.
First, taking ideas from Rust:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-swift" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">protocol</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">ContainsCollection</span><<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">Element</span>> </span>{
associatedtype <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">CollectionType</span> : <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Collection</span> <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">where</span> <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">CollectionType</span>.<span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Element</span> == <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Element</span>
<span class="hljs-func"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">collection</span><span class="hljs-params">()</span> -> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">CollectionType</span>
}
<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">extension</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">String</span> : <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">ContainsCollection</span><span class="hljs-generics"><Character></span>, <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">ContainsCollection</span><span class="hljs-generics"><UnicodeScalar></span>, <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">ContainsCollection</span><span class="hljs-generics"><CChar></span> </span>{
<span class="hljs-func"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">collection</span><span class="hljs-params">()</span> -> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">CharacterView</span>
<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">collection</span><span class="hljs-params">()</span> -> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">UnicodeScalarView</span>
<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">collection</span><span class="hljs-params">()</span> -> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">ContiguousArray</span><span class="hljs-generics"><CChar></span>
}</span>
</code></pre>
<p style="margin:0px 0px 1.2em!important">Generic parameters are
used to disambiguate between different conformances, and associated
types are just matched. Explicit <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
typealias</code> specifiction is prohibited, because conflicts.</p>
<p style="margin:0px 0px 1.2em!important">Second, without modifying
current protocol declaration syntax:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-swift" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"><span class="hljs-class"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">protocol</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold;color:rgb(68,85,136);font-weight:bold">ContainsCollection</span> </span>{
associatedtype <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Element</span>
associatedtype <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">CollectionType</span> : <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Collection</span> <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">where</span> <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">CollectionType</span>.<span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Element</span> == <span class="hljs-type" style="color:rgb(68,85,136);font-weight:bold">Element</span>
<span class="hljs-func"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">collection</span><span class="hljs-params">()</span> -> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">CollectionType</span>
}
<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">extension</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">String</span> : <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">ContainsCollection</span><span class="hljs-generics"><Element: Character></span>, <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">ContainsCollection</span><span class="hljs-generics"><Element: UnicodeScalar></span>, <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">ContainsCollection</span><span class="hljs-generics"><Element: CChar></span> </span>{
<span class="hljs-func"><span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">collection</span><span class="hljs-params">()</span> -> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">CharacterView</span>
<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">collection</span><span class="hljs-params">()</span> -> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">UnicodeScalarView</span>
<span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">func</span> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">collection</span><span class="hljs-params">()</span> -> <span class="hljs-title" style="color:rgb(153,0,0);font-weight:bold">ContiguousArray</span><span class="hljs-generics"><CChar></span>
}</span>
</code></pre>
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