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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>Changed the implementation to this:</p>
<pre><code class="swift">public var size: Int { return _sizeof(self._metatype) }
public var stride: Int { return _strideof(self._metatype) }
public var alignment: Int { return _alignof(self._metatype) }
public static var size: Int { return _sizeof(T.metatype) }
public static var stride: Int { return _strideof(T.metatype) }
public static var alignment: Int { return _alignof(T.metatype) }
</code></pre>
<p>Where the internal functions are based on current swift implementation except that instead of <code>T.Type</code> it would be better to use <code>AnyMetatype</code>.</p>
<pre><code class="swift">internal func _sizeof(_ metatype: AnyMetatype) -> Int {
return Int(Builtin.sizeof(metatype))
}
internal func _strideof(_ metatype: AnyMetatype) -> Int {
return Int(Builtin.strideof_nonzero(metatype))
}
internal func _alignof(_ metatype: AnyMetatype) -> Int {
return Int(Builtin.alignof(metatype))
}
</code></pre>
<p>I can’t test this because current <code>sizeof</code>, <code>strideof</code> and <code>alignof</code> are using <code>T.Type</code> where something like this doesn’t work:</p>
<pre><code class="swift">sizeof(Int.self) // 8
sizeof(CustomStringConvertible.self) // 40
sizeof(Int.self as CustomStringConvertible.Type) // Error
</code></pre>
<p>That said I can only assume that the buildin function will return the correct value for the provided metatype.</p>
<pre><code class="swift">let x = Int // equals Type<Int>.sharedInstance
x.size // 8
let y = Type<CustomStringConvertible>.cast(x)
y?.size // should be 8 as well
</code></pre>
<p><code>size</code> and <code>alignment</code> would work analogically.</p>
<pre><code class="swift">Type<T>.size // always returns the size of 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_1468606831339898112" 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"><span><div><p 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; margin: 0px 0px 1.2em !important;">Next, I’d like to remind you of my<span class="Apple-converted-space"> </span><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); 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);">
size</code>,<span class="Apple-converted-space"> </span><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); 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);">
stride</code>,<span class="Apple-converted-space"> </span><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); 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);">
align</code><span class="Apple-converted-space"> </span>concerns. Consider this example:</p><pre style="color: rgb(0, 0, 0); font-size: 1em; 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-family: Consolas, Inconsolata, Courier, monospace; 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; white-space: pre; overflow: auto; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248); display: block !important; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color: rgb(51, 51, 51); font-weight: bold;">let</span> x = <span class="hljs-type" style="color: rgb(68, 85, 136); font-weight: bold;">Type</span><<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;">let</span> y = <span class="hljs-type" style="color: rgb(68, 85, 136); font-weight: bold;">Type</span><<span class="hljs-type" style="color: rgb(68, 85, 136); font-weight: bold;">CustomStringConvertible</span>>(casting: x)!
x.size <span class="hljs-comment" style="color: rgb(153, 153, 136); font-style: italic;">//=> 8</span>
y.size <span class="hljs-comment" style="color: rgb(153, 153, 136); font-style: italic;">//=> 8 or 40?</span>
</code></pre><p 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; margin: 0px 0px 1.2em !important;">I think that<span class="Apple-converted-space"> </span><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); 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);">
y.size</code><span class="Apple-converted-space"> </span>should be 8, because we are dynamically checking size of particular instance<span class="Apple-converted-space"> </span><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); 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);">
y</code>, which refers to specific subtype of<span class="Apple-converted-space"> </span><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); 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);">
CustomStringConvertible</code>.<span class="Apple-converted-space"> </span></p></div></span></blockquote></div><div class="bloop_markdown"><p></p></div></body></html>