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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>I’d be in favor if we could look at this topic further - <a href="https://github.com/apple/swift/blob/master/docs/GenericsManifesto.md#allowing-subclasses-to-override-requirements-satisfied-by-defaults-">Generics Manifesto: Allowing subclasses to override requirements satisfied by defaults</a>.</p>
<p>In my world this should look like this:</p>
<pre><code class="swift">protocol P {
func foo()
}
extension P {
func foo() { print("P") }
}
class C : P {
// gets the protocol extension's
// or override it
override func foo() {
// do your work or optionally call the default implementation
default.foo() // Notice how `default` suits here better than `super`
}
}
class D : C {
override func foo() {
// #1 - if `C` has not overridden `foo()`
print("D")
// or
default.foo()
// #2 - if `C` has overridden `foo()`
print("D") // ignore everything
// or call `super`
super.foo()
// or even `default`
default.foo()
}
}
</code></pre>
<p><code>C</code> does not necessarily need to be a class, that should be the same behavior for value types as well.</p>
<p>Additional to that we could make default implementations <code>final</code> so that you cannot override them from the conforming type at all.</p>
<p>Having this much of power and flexibility would be simply great.</p>
<p>Plus the mentioned behavior from the current thread should not even exist IMO. </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_1486758757810978816" 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 10. Februar 2017 um 21:29:46, Anton Zhilin 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><div></div><div>
<title></title>
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<p style="margin:0px 0px 1.2em!important">I’d even suggest to force
<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">
final</code> for such methods:</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">Fooable</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">Fooable</span> </span>{
<span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// func foo() { } // error: must be declared as final</span>
final <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">foo</span><span class="hljs-params">()</span> </span>{ } <span class="hljs-comment" style="color:rgb(153,153,136);font-style:italic">// ok</span>
}
</code></pre>
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