<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="">Hello,</div><div class=""><br class=""></div><div class="">It’s my first time using this mailing list, so please do let me know if I’m doing something wrong.</div><div class=""><br class=""></div>I personally agree with the `[]` syntax because it allows for something more like `[lazy, atomic]` without having to look a lot like Java annotations (which do something completely different). I think the `@` syntax should be reserved for compiler directives. The `[]` mechanism also could be expanded on like so:<div class=""><br class=""></div><div class="">```swift</div><div class="">/// abc is both lazy and atomic in behavior</div><div class="">var [lazy, atomic] abc: Int = 1234</div><div class=""><br class=""></div><div class="">/// ^ expands to:</div><div class="">var `abc.lazy` = LazyBehavior<Int> { 1234 }</div><div class="">var `abc.atomic`: AtomicBehavior<Int> { `abc.lazy` }</div><div class="">var abc: Int {</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>get { return `abc.atomic`.get() }</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>set(val) { `abc.atomic`.set(val) }</div><div class="">}</div><div class="">```</div><div class=""><br class=""></div><div class="">That is, in the order of appearance of the behaviors within the brackets, their behaviors will become a composed chain. Now this also means that some behaviors can only be initial or terminal, which must be specified through other syntactical means. In addition:</div><div class=""><br class=""></div><div class=""><div class="">```swift</div><div class="">/// abc has behavior `myBehavior` which requires a parameter</div><div class="">var [myBehavior(parameter: true)] abc: Int = 1234</div></div><div class="">```</div><div class=""><br class=""></div><div class="">Again, this also further increases complexity, and possibly the need for a separate `behavior` declaration, instead of piggybacking on `protocol` (it could possibly be similar to `operator` syntax?).</div><div class=""><div class="">
<div id="signature" class=""><br class="Apple-interchange-newline"><span style="color: rgb(0, 0, 0); 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; display: inline !important; float: none;" class="">--</span><br style="color: rgb(0, 0, 0); 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;" class=""><span style="color: rgb(0, 0, 0); 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; display: inline !important; float: none;" class="">Aditya Vaidyam</span><br style="color: rgb(0, 0, 0); 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;" class=""><br style="color: rgb(0, 0, 0); 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;" class=""><span style="color: rgb(0, 0, 0); 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; display: inline !important; float: none;" class="">Purdue University</span><br style="color: rgb(0, 0, 0); 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;" class=""><span style="color: rgb(0, 0, 0); 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; display: inline !important; float: none;" class="">College of Science ‘17</span><br style="color: rgb(0, 0, 0); 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;" class=""><span style="color: rgb(0, 0, 0); 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; display: inline !important; float: none;" class="">Neurobiology and Physiology, Computer Science, Pre-medicine</span></div>
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<br class=""><div><blockquote type="cite" class=""><div class="">On Feb 14, 2016, at 3:36 PM, Brent Royal-Gordon 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=""><blockquote type="cite" class="">I’m sorry if this has already been discussed, but what are the drawbacks of putting the variable's behaviors before the ‘var’ keyword? Like this:<br class=""><br class="">lazy synchronized var x:SomeType<br class=""></blockquote><br class="">With no prefix at all, this limits our ability to introduce declaration modifiers in the future. For instance, if the people clamoring for a `local` access modifier win in Swift 4, anyone who wrote a behavior called `local` will be very sad.<br class=""><br class="">The other problem is, with this declaration:<br class=""><br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>lazy var array = [1, 2, 3]<br class=""><br class="">It offers no way to disambiguate between the two meanings of `lazy`:<br class=""><br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>array.lazy.reset()<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>array.lazy.map { ... }<br class=""><br class="">Personally, if we're not going to use the `[]` syntax, I think we should use the `@` prefix and think of all uses of `@` throughout the language as eventual targets for behavior-ization (even if we don't get around to most of them in Swift 3, or some of them ever). It would be nice to have a rational explanation for what `@` means. But I'm reasonably happy with the `[]` syntax.<br class=""><br class="">-- <br class="">Brent Royal-Gordon<br class="">Architechies<br class=""><br class="">_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class="">https://lists.swift.org/mailman/listinfo/swift-evolution<br class=""></div></div></blockquote></div><br class=""></div></body></html>