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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>Implementation gist updated to reflect everything: <a href="https://gist.github.com/DevAndArtist/a5744f21107812b2d4e6baee2c55e0bf">https://gist.github.com/DevAndArtist/a5744f21107812b2d4e6baee2c55e0bf</a></p>
<p>I’ll look into <code>size</code> etc. issue now.</p>
<p>We should tackle this proposal asap because we’re almost out of time for Swift 3.</p>
<p>The public api will look like this:</p>
<pre><code class="swift">public final class Type<T> : Hashable, CustomStringConvertible, CustomDebugStringConvertible {
public static var sharedInstance: Type<T> { get }
public static func cast<U>(_ optionalType: Type<U>?) -> Type<T>?
public func `is`<U>(_ otherType: Type<U>) -> Bool
public var metatype: Metatype<T> { get }
public static var metatype: Metatype<T> { get }
public var size: Int { get }
public var stride: Int { get }
public var alignment: Int { get }
public static var size: Int { get }
public static var stride: Int { get }
public static var alignment: Int { get }
public var hashValue: Int { get }
public var description: String { get }
public var debugDescription: String { get }
}
public func ==<T, U>(lhs: Type<T>, rhs: Type<U>) -> Bool
</code></pre>
<p>Additional changes:</p>
<pre><code class="swift">public func unsafeBitCast<T, U>(_ x: T, to: Type<U>) -> U
public func dynamicType<T>(_ instance: T) -> Type<T>
</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_1468605028564326144" 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 15. Juli 2016 um 19:26:15, 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>Done. Personally I don’t care much if it’s
<code>.cast(from:)</code> or <code>.cast(_:)</code>.</p>
<p>Now whenever <code>Type<T></code> is created and if there
is no reference in type storage (which I updated to be a
<code>Set</code> instead of a <code>Dictionary</code>) that
contains the dynamic metatype from our current instance, it
automatically downcasts itself to <code>Type<Any></code> and
insert itself into the type storage.</p>
<p>There is one more thing I’d like to discuss before we finally
move to <code>size</code> etc.</p>
<p>Consider what I said above, I feel like we should tackle
this:</p>
<ul>
<li>drop <code>init(_ copy: Type<T>)</code> - to keep
equality of <code>Type<T></code> references</li>
<li>make all initializer internal and as exchange make
<code>sharedInstance</code> public.</li>
</ul>
<p>This would ensure that you will always get a reference from the
type storage, and that there can only exist one for each (dynamic)
metatype.</p>
<p>I can’t foresee the future, so I’m wondering if the type may
mutate somehow when reflections are added? If so, I don’t see why
we should lock references inside a single storage and care about
<code>===</code>.</p>
</div>
<div class="bloop_original_html">
<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_1468602563992404992" 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 15. Juli 2016 um 19:05:56, Anton Zhilin
(<a href="mailto:antonyzhilin@gmail.com">antonyzhilin@gmail.com</a>)
schrieb:</p>
<blockquote type="cite" class="clean_bq">
<div><span><span style="color: rgb(0, 0, 0); font-family: 'helvetica Neue', helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;">
Brilliant! But I disagree with<span class="Apple-converted-space"> </span></span><code style="color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; 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); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; display: inline; background-color: rgb(248, 248, 248);">from</code><span style="color: rgb(0, 0, 0); font-family: 'helvetica Neue', helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;"><span class="Apple-converted-space"> </span>label.
“Cast from type” means that we somehow use<span class="Apple-converted-space"> </span></span><code style="color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; 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); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; display: inline; background-color: rgb(248, 248, 248);">Type<U></code><span style="color: rgb(0, 0, 0); font-family: 'helvetica Neue', helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;"><span class="Apple-converted-space"> </span>statically.
But we need to cast<span class="Apple-converted-space"> </span></span><code style="color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; 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); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; display: inline; background-color: rgb(248, 248, 248);">optionalType</code><span style="color: rgb(0, 0, 0); font-family: 'helvetica Neue', helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;"><span class="Apple-converted-space"> </span>itself
to<span class="Apple-converted-space"> </span></span><code style="color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; 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); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; display: inline; background-color: rgb(248, 248, 248);">Type<T></code><span style="color: rgb(0, 0, 0); font-family: 'helvetica Neue', helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;">.
I suggest to use<span class="Apple-converted-space"> </span></span><code style="color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; 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); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; display: inline; background-color: rgb(248, 248, 248);">cast(_:)</code><span style="color: rgb(0, 0, 0); font-family: 'helvetica Neue', helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;"><span class="Apple-converted-space"> </span>signature.</span></span></div>
</blockquote>
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