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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>Here are a few more thoughts on solving a few problems with dropped <code>.self</code> in mind:</p>
<ol>
<li><p><code>Type<SomeType></code> cannot become <code>Type<Type<SomeType>></code> to prevent infinite recursion.</p></li>
<li><p>Any other type without the short form for initializer <code>SomeType(...)</code> or explicit access to static members or initializer like <code>SomeType.init(...)</code> or <code>SomeType.staticMember</code> will be automatically become <code>Type<SomeType></code> - if it’s not part of an array or dictionary shorthand syntax.</p></li>
<li><p>For array and dictionary shorthand syntax any type (except other nested array and dictionary shorthand types) does not follow the second rule from above (dropped <code>.self</code> in mind):</p>
<ul>
<li><code>[SomeType]()</code> equals <code>Array<SomeType>()</code></li>
<li><code>[Type<SomeType>]()</code> equals <code>Array<Type<SomeType>>()</code></li>
<li><code>[SomeKeyType: SomeValueType]()</code> equals <code>Dictionary<SomeKeyType, SomeValueType>()</code></li>
<li><code>[Type<SomeKeyType>: Type<SomeValueType>]()</code> equals <code>Dictionary<Type<SomeKeyType>, Type<SomeValueType>>()</code></li>
</ul></li>
</ol>
<p>We also could extend <code>Type<T></code> to provide more useful informations:</p>
<pre><code class="swift">public struct Type<T> : Hashable, CustomStringConvertible, CustomDebugStringConvertible {
// Anyone knows a better name?
public let sealed: T.Type
public var hashValue: Int { /* implement */ }
// Inspired by SE-0101
public var size: Int { /* implement */ }
public var stride: Int { /* implement */ }
public var alignment: Int { /* implement */ }
public var description: String { /* implement */ }
public var debugDescription: String { /* implement */ }
public init() { /* implement */ }
}
</code></pre>
<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_1468055291563095040" 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 8. Juli 2016 um 22:06:30, Adrian Zubarev (<a href="mailto:adrian.zubarev@devandartist.com">adrian.zubarev@devandartist.com</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;"><div></div><div>
<title></title>
<div class="bloop_markdown">
<p>Hello Swift community, before Swift 3 drops I’d like to discuss
if it is reasonable to consider to create a standalone type to
drop/seal the <code>T.Type</code> magic?</p>
<p>However this change does not play well with the proposal of
dropping the <code>.self</code> compiler magic.</p>
<p>Some bikeshedding:</p>
<pre><code class="swift">public struct Type<T> : Hashable {
// Seal the `.Type` magic into this standalone type.
// Disallow `.Type` usage elsewhere
public let sealed: T.Type
public var hashValue: Int { /* implement somehow */ }
public init() {
// Or do it somehow different for the sake of dropping `.self` magic
self.sealed = T.self
}
}
public func ==<T>(lhs: Type<T>, rhs: Type<T>) -> Bool {
return lhs.hashValue == rhs.hashValue
}
</code></pre>
<p>Downside of this approach is the accessibility of the
<code>.Type</code> instance:</p>
<pre><code class="swift">protocol Initializable {
init()
}
func foo<T : Initializable>(type: Type<T>) -> T {
// It would be nice if we could use `type.init()` instead, but than we
// would need more compiler magic :/
return type.sealed.init()
}
</code></pre>
<p>I couldn’t come up with a better name than <code>sealed</code>,
if anyone has a better idea feel free to share your thoughts.</p>
<p>Remember this is a discussion and not (yet) a detailed proposal,
where everyone can provide feedback and bikeshedding for a better
design.</p>
</div>
<div class="bloop_original_html">
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<br></div>
<br>
<div id="bloop_sign_1468001575976519168" class="bloop_sign">
<div style="font-family:helvetica,arial;font-size:13px">
-- <br>
Adrian Zubarev<br>
Sent with Airmail</div>
</div>
</div>
<div class="bloop_markdown"></div>
</div></div></span></blockquote></div><div class="bloop_markdown"><p></p></div></body></html>