<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">I like the idea of separating memory semantics and protocol declaration but this solution is not scalable. Implementing one function like that is feasible but having to implement 20 or more introduces a lot of overhead. A class protocol is only necessary to fulfill the requirements for a weakly referenced instance (e.g. delegate pattern).</div><div class=""><br class=""></div><div class=""><br class=""></div><div><blockquote type="cite" class=""><div class="">On Dec 8, 2015, at 5:52 PM, Daniel Valls Estella <<a href="mailto:daniel@upzzle.com" class="">daniel@upzzle.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Just to clarify.<div class=""><br class=""></div><div class="">I think maybe it’s better to move away class constrain from protocol definitions </div><div class="">and enable such type of restriction when requesting elements alongside with type/protocol conformance requirements.</div><div class=""><br class=""></div><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class=""><font face="Courier New" class="">func doSomething(localvar: MyProtocol class){</font></div><div class=""><font face="Courier New" class=""><br class=""></font></div><div class=""><span class="Apple-tab-span" style="white-space: pre;"><font face="Courier New" class=""> </font></span></div><div class=""><font face="Courier New" class="">}</font></div></div></div><div class=""><br class=""></div><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">El 8 des 2015, a les 17:34, Daniel Valls Estella <<a href="mailto:daniel@upzzle.com" class="">daniel@upzzle.com</a>> va escriure:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Maybe the restriction of being a class wouldn’t have to do anyting in the protocol definition and it is more a concern of who is managing an element (conforming that protocols and some others).</div><div class=""><br class=""></div><div class="">Avoiding protocol modifiers and then when using it and if needed:</div><div class=""><br class=""></div><div class=""><font face="Courier New" class="">func doSomething(localvar: MyProtocol class){</font></div><div class=""><font face="Courier New" class=""><br class=""></font></div><div class=""><span class="Apple-tab-span" style="white-space:pre"><font face="Courier New" class=""> </font></span></div><div class=""><font face="Courier New" class="">}</font></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">In fact, if it will be constrained that way in other situations:</div><div class=""><br class=""></div><div class=""><blockquote type="cite" class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class=""><blockquote type="cite" class=""><div class=""><div class="bloop_original_html" style="font-family: Helvetica, Arial; font-size: 13px; background-color: rgb(254, 254, 254);"><blockquote type="cite" class="clean_bq" style="margin: 15px 0px;"><span class="" style="margin-top: 0px; margin-bottom: 0px;"><div dir="auto" class=""><div class=""><blockquote type="cite" class="" style="margin: 15px 0px;"><div class="" style="margin-top: 0px; margin-bottom: 0px;"><div class=""><blockquote type="cite" class="" style="margin: 15px 0px;"><div class="" style="margin-bottom: 0px;"><span class="" style="font-family: Helvetica; font-size: 12px; float: none; display: inline !important;">protocol Foo { typealias T: class }</span><br class="" style="font-family: Helvetica; font-size: 12px;"><br class="" style="font-family: Helvetica; font-size: 12px;"><span class="" style="font-family: Helvetica; font-size: 12px; float: none; display: inline !important;">func foo<T: class>(x: T)</span></div></blockquote></div></div></blockquote></div></div></span></blockquote></div></div></blockquote></div></div></blockquote><br class=""></div><div class="">I understant T can also be a protocol no only a concrete implementation, a class.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">In that way, and it’s another branch to talk about, perhaps it is desirable to constrain method parameters to more than one protocol at a time. </div><div class=""><br class=""></div><div class=""><div class=""><font face="Courier New" class="">func doSomething(localvar: MyProtocol Equatable){</font></div><div class=""><font face="Courier New" class=""><br class=""></font></div><div class=""><span class="Apple-tab-span" style="white-space: pre;"><font face="Courier New" class=""> </font></span></div><div class=""><font face="Courier New" class="">}</font></div></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div class=""><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">El 8 des 2015, a les 10:56, Felix Gabel via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> va escriure:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">I can only think of one use case for restricting a protocol to be only conformable by structs or enums and that is their special behavior for 'willSet’ and ‘didSet’. But this is already discussed in another thread. </div><div class=""><br class=""></div><div class="">It boils down to this: The sole purpose for a class protocol is its memory management semantics.</div><div class=""><br class=""></div><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Dec 8, 2015, at 7:43 AM, Adrian Zubarev via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="bloop_markdown" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: 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(254, 254, 254);"><p style="margin: 15px 0px; -webkit-margin-before: 0px;" class="">Lets say (and hope) in some future we’ll be able to write functions like this:</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;" class=""><code class="swift" 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; -webkit-margin-before: 0px;">func foo<T: class>(_: T) { /* do something */ }
func foo<T: enum>(_: T) { /* do something */ }
func foo<T: struct>(_: T) { /* do something */ }
// or we might want to have more than one generic types
func foo<A: class, B: enum, C: struct>(_: A, _: B, _: C) {
// do something better
}
// try to use `where` clause with `class A`, `struct C`. It looks ugly to me.
</code></pre><p style="margin: 15px 0px;" class="">So ins’t it better to stick to the original syntax and write code like this!?</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;" class=""><code class="swift" 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; -webkit-margin-before: 0px;">protocol MagicType {} // can be applied to any type
protocol ClassType: class {} // only for classes
protocol StructType: struct {} only for structs
protocol ValueType: struct, enum {}
protocol MixedType: struct, class {}
</code></pre><p style="margin: 15px 0px;" class="">This is why in my eyes the current syntax for protocols is just perfect.</p><div style="margin: 15px 0px;" class=""><br class="webkit-block-placeholder"></div></div><div class="bloop_original_html" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant: 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(254, 254, 254);"><div id="bloop_customfont" style="font-family: Helvetica, Arial; font-size: 13px; margin: 0px;" class=""><br class=""></div><br class=""><div id="bloop_sign_1449556337510558208" class="bloop_sign"><div class=""><font face="helvetica, arial" class="">— </font></div><div class="">Regards Adrian<br class=""></div></div><br class=""><p class="airmail_on" style="margin: 15px 0px;">Am 7. Dezember 2015 bei 23:29:34, Felix Gabel via swift-evolution (<a href="mailto:swift-evolution@swift.org" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;" class="">swift-evolution@swift.org</a>) schrieb:</p><blockquote type="cite" class="clean_bq" style="margin: 15px 0px;"><span style="margin-top: 0px; margin-bottom: 0px;" class=""><div dir="auto" class=""><div class=""></div><div class=""><div class="">Great to hear about being able to apply this to type parameters and associated types in the future. But I still propose to rethink the syntax decision. </div><div class=""> </div><div class="">class protocol FooType {}</div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">typealias class Bar: FooType</span></div><div class="">func foo<class T>()</div><div class=""><br class=""></div><div class="">This is more consistent with for example the declaration of a class or property</div><div class=""><br class=""></div><div class="">Construct name: Type</div><div class=""><br class="">On 07 Dec 2015, at 23:04, Douglas Gregor via swift-evolution <<a href="mailto:swift-evolution@swift.org" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;" class="">swift-evolution@swift.org</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" style="margin: 15px 0px;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""><div class=""><blockquote type="cite" class="" style="margin: 15px 0px;"><div class="" style="margin-top: 0px;">On Dec 7, 2015, at 8:58 AM, Joe Groff via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="" style="margin-bottom: 0px;"><blockquote type="cite" class="" style="margin: 15px 0px; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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;"><br class="Apple-interchange-newline" style="margin-top: 0px;">On Dec 7, 2015, at 8:00 AM, Matthew Cheok via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="" style="color: rgb(65, 131, 196); background-color: inherit; text-decoration: none;">swift-evolution@swift.org</a>> wrote:<br class=""><br class="">Currently, we declare class protocols with the following syntax:<br class=""><br class="">protocol TestProtocol: class, OtherProtocol {}<br class=""><br class="">This is odd for a few reasons:<br class="">1) The keyword class exists in the middle of the declaration<br class="">2) The keyword class follows the colon and looks a lot like inheritance<br class="">3) The keyword class occupies a somewhat arbitrary first position after the colon (otherwise we have an error)<br class=""><br class="">We also have another use of the class keyword as a modifier when declaring class methods:<br class=""><br class="">class func doSomething() {}<br class=""><br class="">I’m suggesting a change of syntax that rectifies the above issues:<br class=""><br class="">class protocol TestProtocol: OtherProtocol {}<br class=""><br class="">Would love to hear other thoughts on this.<br class="" style="margin-bottom: 0px;"></blockquote><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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 class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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; float: none; display: inline !important;">The constraint syntax is used because, in the fullness of time, it should also be applicable to type parameters and associated types:</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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;"><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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 class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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; float: none; display: inline !important;">protocol Foo { typealias T: class }</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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;"><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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 class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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; float: none; display: inline !important;">func foo<T: class>(x: T)</span><br class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: 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></blockquote></div><div class=""><br class=""></div>Right. This is exactly the reason why we have the syntax<div class=""><br class=""></div><div class="">protocol X : class { … }</div><div class=""><br class=""></div><div class="">and why I’m against changing the current syntax.<br class=""><div class=""><br class=""></div><div class="">- Doug</div><div class=""><br class=""></div></div><img src="https://u2002410.ct.sendgrid.net/wf/open?upn=T04LrBojaExXAX0mv-2F2MMtIB9rMFpWjvqf12Pj37IVIQdiJlhqFhPxhoW4X9vomSq4Lb8BPtoy6tsuc7Z-2FPfx-2BPnEHHWg0PcA8l4PIB-2F2Tu4Sm58e8H9F64Tlul3U6zKJIQnbgFKBUujC6Lj6DT2qdu4jJqfeKhy9BF09qIXjUHsc9n6guEjf8v67cSuw8GELmpZv-2Ba0USWU6sLApSSqTQwTDz7dsrYe8pXSYOTqomg-3D" alt="" width="1" height="1" border="0" style="height: 1px !important; width: 1px !important; border-width: 0px !important; margin: 0px !important; padding: 0px !important;" class=""></div></blockquote><blockquote type="cite" style="margin: 15px 0px;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class=""><span class="">_______________________________________________</span><br class=""><span class="">swift-evolution mailing list</span><br class=""><span class=""><a href="mailto:swift-evolution@swift.org" style="color: rgb(65, 131, 196); 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