<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="">.NET has them and I never felt that I needed them. For me, a property implies something that can be looked up.<div class=""><br class=""></div><div class="">What's the downside of using a method?<br class=""><div class=""><div class="">
<br class="Apple-interchange-newline"><span style="color: rgb(0, 0, 0); font-family: 'Lucida Grande'; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; float: none;" class="">Félix</span>
</div>
<br class=""><div><blockquote type="cite" class=""><div class="">Le 7 janv. 2016 à 10:47:20, David James via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> a écrit :</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="">Currently Swift has computed properties that support get or get and set, but not set only. There are use cases where we would want set only. <div class=""><br class=""></div><div class="">For example, toggling a boolean which changes another stored property where it would be overkill to make a method for that. It's more intuitive to just assign a boolean. e.g. myObject.myBoolean = true</div><div class=""><br class=""></div><div class="">Another example, setting an object that is introspected in order to create a new object which is then stored on a different property. The property that is stored could be readonly/get, for example. A method for the setter (e.g. setSomething) would not be as intuitive as just a plain assignment (e.g. myObject.something = ..). </div><div class=""><br class=""></div><div class="">Another consideration is that a pure setter would support better information hiding. You may not want the parent object to expose the property. Example scenario: set a property on an object (via assignment), which creates/modifies a stored property based on the passed (set) value, and then pass the parent object to another part of the system which can than read the stored property but <u class="">not</u> the original set property — i.e. you may not want to expose the original set property to another part of the system.</div><div class=""><br class=""></div><div class="">Example:</div><div class=""><br class=""></div><div class=""><div class="">var myProperty:MyClass {</div><div class=""> set {</div><div class=""> …</div><div class=""> }</div><div class="">}<br class=""></div></div><div class=""><br class=""></div><div class="">One concern is that without ‘get’ there really is no property at all, and perhaps this is the reason that pure setter was never included. However, this does not invalidate the above.</div><div class=""><br class=""></div><div class=""><div class="">As an alternative (to make it more semantically sensible) we could introduce a new keyword ‘set’, so:</div><div class=""><br class=""></div><div class=""><div class="">set myProperty:MyClass {</div><div class=""> ...</div><div class="">}<br class=""></div></div><div class=""><br class=""></div><div class="">Which would support simple assignment:</div><div class=""><br class=""></div><div class="">myObject.myProperty = myOtherObject</div><div class=""><br class=""></div><div class="">Finally, it’s important to know that this is still “computed", but only computed on the input, not on the output side.</div><div class=""><div class=""><br class=""></div><div class=""><div apple-content-edited="true" class=""><div style="font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><span class="Apple-style-span" style="border-collapse: separate; line-height: normal; border-spacing: 0px;"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><span class="Apple-style-span" style="border-collapse: separate; font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><span class="Apple-style-span" style="border-collapse: separate; font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">David James</div></div></span></div></span></div></span></div></div>
</div>
<br class=""></div></div></div>
<img src="https://u2002410.ct.sendgrid.net/wf/open?upn=iRI3beHTe3UxYAHTlV3lA38zIPfHMhyuRzgTmGKV6k7A8T-2Fx8ViL3eYcSVNlVzpVBJ2-2BbX07eRSACehou4SS7Y-2FrOfczCeaNiYLmz2H76yFyR3pUPUM8FzAP9XNIFJvcmY1GqITEXc1irvWvoNq3fYIxtglD-2FvDZP7NlFUbWToILQYqAf8RDWENdFVOdVuYuRDgHp56fSy68gjSKCl-2Bpdz6jlPkInLpEf-2BMn0CmNc3o-3D" alt="" width="1" height="1" border="0" style="height:1px !important;width:1px !important;border-width:0 !important;margin-top:0 !important;margin-bottom:0 !important;margin-right:0 !important;margin-left:0 !important;padding-top:0 !important;padding-bottom:0 !important;padding-right:0 !important;padding-left:0 !important;" class="">
</div>
_______________________________________________<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></blockquote></div><br class=""></div></div></body></html>