<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">+1 to this. Subscripts should also be able to throw and currently cannot.<div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Dec 5, 2015, at 9:08 PM, Nikolai Vazquez 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 dir="ltr" class=""><div class="">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 class=""><br class=""></div><div class="">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 class=""><div class=""><div class=""><br class=""></div><div class=""><div class="">```swift</div><div class="">struct File<Data> {</div><div class=""> var contents: Data {</div><div class=""> get throws { ... }</div><div class=""> set throws { ... }</div><div class=""> }</div><div class="">}</div><div class="">```</div></div></div><div class=""><br class=""></div><div class="">A better example would be getting and setting the current working directory of the process:</div><div class=""><br class=""></div><div class=""><div class="">```swift</div><div class="">import Foundation</div><div class=""><br class=""></div><div class="">extension Process {</div><div class=""> static var workingDirectory: String {</div><div class=""> get {</div><div class=""> let fileManager = NSFileManager.defaultManager()</div><div class=""> return fileManager.currentDirectoryPath</div><div class=""> }</div><div class=""> set throws {</div><div class=""> let fileManager = NSFileManager.defaultManager()</div><div class=""> guard fileManager.changeCurrentDirectoryPath(newValue) else {</div><div class=""> throw Error("...")</div><div class=""> }</div><div class=""> }</div><div class=""> }</div><div class="">}</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">```</div></div><div class=""><br class=""></div><div class=""><br class=""></div></div></div>
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