<div dir="ltr">+1<br></div><br><div class="gmail_quote"><div dir="ltr">On Sat, Dec 5, 2015 at 10:17 PM Matthew Johnson via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">+1 to this. Subscripts should also be able to throw and currently cannot.</div><div style="word-wrap:break-word"><div><br></div><div><br><div><blockquote type="cite"><div>On Dec 5, 2015, at 9:08 PM, Nikolai Vazquez via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:</div><br><div><div dir="ltr"><div>One of the aspects of Swift that I like is computed properties for structures and classes. It allows for adding logic when obtaining values or for having the returned value be dependent on another.</div><div><br></div><div>As of the `ErrorType` protocol introduction in Swift 2, we can throw errors when it comes to functions and initializers. However, this does not apply to getters and setters.</div><div><div><div><br></div><div><div>```swift</div><div>struct File<Data> {</div><div> var contents: Data {</div><div> get throws { ... }</div><div> set throws { ... }</div><div> }</div><div>}</div><div>```</div></div></div><div><br></div><div>A better example would be getting and setting the current working directory of the process:</div><div><br></div><div><div>```swift</div><div>import Foundation</div><div><br></div><div>extension Process {</div><div> static var workingDirectory: String {</div><div> get {</div><div> let fileManager = NSFileManager.defaultManager()</div><div> return fileManager.currentDirectoryPath</div><div> }</div><div> set throws {</div><div> let fileManager = NSFileManager.defaultManager()</div><div> guard fileManager.changeCurrentDirectoryPath(newValue) else {</div><div> throw Error("...")</div><div> }</div><div> }</div><div> }</div><div>}</div><div><br></div><div><br></div><div><br></div><div>```</div></div><div><br></div><div><br></div></div></div>
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