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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></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><p class="airmail_on">Am 13. Juli 2016 um 18:30:53, Anton Zhilin (<a href="mailto:antonyzhilin@gmail.com">antonyzhilin@gmail.com</a>) schrieb:</p> <div><blockquote type="cite" class="clean_bq" style="margin: 15px 0px; font-family: Helvetica, Arial; font-size: 13px; 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;"><span style="margin-top: 0px; margin-bottom: 0px;"><div><div class="gmail_quote" 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;"><div>I see model of<span class="Apple-converted-space"> </span><font face="monospace, monospace">Type<T></font><span class="Apple-converted-space"> </span>as follows:</div><div><ol style="margin: 15px 0px;"><li style="margin: 15px 0px;">Values of<span class="Apple-converted-space"> </span><font face="monospace, monospace">Type<T></font><span class="Apple-converted-space"> </span>are identifiers of types (8 bytes, I guess)<br></li><li style="margin: 15px 0px;">All used identifiers are contained in<span class="Apple-converted-space"> </span><font face="monospace, monospace">Type<Any></font><br></li><li style="margin: 15px 0px;"><font face="monospace, monospace">Type<T></font><span class="Apple-converted-space"> </span>contains a subset of those identifiers</li></ol></div></div></div></span></blockquote></div><p>I can’t follow your though here. Is this a totally new behavior?</p><div><div><blockquote type="cite" class="clean_bq" style="margin: 15px 0px; font-family: Helvetica, Arial; font-size: 13px; 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;"><span style="margin-top: 0px; margin-bottom: 0px;"><div><div class="gmail_quote" 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;"><div><ol style="margin: 15px 0px;"><li style="margin: 15px 0px;"><font face="monospace, monospace">Type<T></font><span class="Apple-converted-space"> </span>are usually created with default constructor<span class="Apple-converted-space"> </span><font face="monospace, monospace">Type<T>()</font></li></ol></div></div></div></span></blockquote></div><p>That one is easy and already there.</p><div><div><blockquote type="cite" class="clean_bq" style="margin: 15px 0px; font-family: Helvetica, Arial; font-size: 13px; 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;"><span style="margin-top: 0px; margin-bottom: 0px;"><div><div class="gmail_quote" 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;"><div><ol style="margin: 15px 0px;"><li style="margin: 15px 0px;">Upcasting uses constructor<span class="Apple-converted-space"> </span><font face="monospace, monospace">init<U: T>(upcasting: Type<U>)</font></li></ol></div></div></div></span></blockquote></div><p>It does look neat but I can’t implement it. At least I have no clue how to solve the problem that `T` is not a protocol or a class type.</p><div><div><blockquote type="cite" class="clean_bq" style="margin: 15px 0px; font-family: Helvetica, Arial; font-size: 13px; 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;"><span style="margin-top: 0px; margin-bottom: 0px;"><div><div class="gmail_quote" 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;"><div><ol style="margin: 15px 0px;"><li style="margin: 15px 0px;">Checking for conformance uses method<span class="Apple-converted-space"> </span><font face="monospace, monospace">isSubtype(of:)</font></li></ol></div></div></div></span></blockquote></div><p>Interesting suggestion.</p><div><div><blockquote type="cite" class="clean_bq" style="margin: 15px 0px; font-family: Helvetica, Arial; font-size: 13px; 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;"><span style="margin-top: 0px; margin-bottom: 0px;"><div><div class="gmail_quote" 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;"><div><ol style="margin: 15px 0px;"><li style="margin: 15px 0px;">Size of<span class="Apple-converted-space"> </span><font face="monospace, monospace">Type<Type<T>></font><span class="Apple-converted-space"> </span>is 8, static size of<span class="Apple-converted-space"> </span><font face="monospace, monospace">Type<SomeProtocol></font><span class="Apple-converted-space"> </span>is 0</li></ol></div></div></div></span></blockquote></div><p>I feel like you mean something different here than this:</p><p>```swift</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span style="font-variant-ligatures: no-common-ligatures;">protocol</span><span style="font-variant-ligatures: no-common-ligatures;"> SomeProtocol {}</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo; min-height: 13px;"><span style="font-variant-ligatures: no-common-ligatures"></span><br></p><p>
</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span style="font-variant-ligatures: no-common-ligatures;">sizeof</span><span style="font-variant-ligatures: no-common-ligatures;">(</span><span style="font-variant-ligatures: no-common-ligatures">SomeProtocol</span><span style="font-variant-ligatures: no-common-ligatures;">.</span><span style="font-variant-ligatures: no-common-ligatures;">self</span><span style="font-variant-ligatures: no-common-ligatures;">) == </span><span style="font-variant-ligatures: no-common-ligatures;">40</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span style="font-variant-ligatures: no-common-ligatures;">```</span></p><div><div><blockquote type="cite" class="clean_bq" style="margin: 15px 0px; font-family: Helvetica, Arial; font-size: 13px; 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;"><span style="margin-top: 0px; margin-bottom: 0px;"><div><div class="gmail_quote" 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;"><a href="http://airmail.calendar/2016-07-13 17:25:00 MESZ" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;"><br class="Apple-interchange-newline">2016-07-13 18:25 GMT+03:00</a><span class="Apple-converted-space"> </span>Adrian Zubarev via swift-evolution<span class="Apple-converted-space"> </span><span dir="ltr"><<a href="mailto:swift-evolution@swift.org" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">swift-evolution@swift.org</a>></span>:<blockquote class="clean_bq" style="margin: 15px 0px;"><div style="margin-top: 0px; margin-bottom: 0px; word-wrap: break-word;"><div><p style="margin: 15px 0px;">a = SomeClass.self<br></p><pre style="margin: 15px 0px; font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(204, 204, 204); overflow: auto; padding: 4px 8px; word-break: normal; word-wrap: normal;"><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 0px; margin: 0px; padding: 0px; word-break: normal; word-wrap: normal;">expectTrue(a as? Any.Type == SomeClass.self)
expectTrue(a as? AnyClass == SomeClass.self)
expectTrue(a as? SomeClass.Type == SomeClass.self)</code></pre></div></div></blockquote><div>That example just demonstrates syntax of metatypes and does not count.</div><blockquote class="clean_bq" style="margin: 15px 0px;"><div style="margin-top: 0px; margin-bottom: 0px; word-wrap: break-word;"><div><ul style="margin: 15px 0px;"><li style="margin: 15px 0px;"><p style="margin: 15px 0px;">What about<span class="Apple-converted-space"> </span><code style="font-family: Menlo, Consolas, 'Liberation Mono', Courier, monospace; font-size: 10pt; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; background-color: rgb(248, 248, 248); color: inherit; border: 1px solid rgb(234, 234, 234); margin: 0px 2px; padding: 0px 5px; word-break: normal; word-wrap: normal;">dynamicType</code>?</p></li></ul></div></div></blockquote><div>It should have the following signature:</div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">func dynamicType<T>(_ var: T) -> Type<T></font></div><div><br></div><div>To return Type<T> means to return an identifier of U: T</div></div></div></span></blockquote></div><p>Was this a typo?</p><p><span style="font-family: monospace, monospace; font-size: 14px;">func dynamicType<U: T>(_ var: T) -> Type<U></span></p><p><font face="Helvetica">PS: If you’d like to join on this idea, I could move the draft to a repo to be able to write the proposal together. You had some good catchy ideas there.</font></p><div></div></div></div></div></div></div></div><div class="bloop_markdown"><p></p></div></body></html>