<html><body><div id="edo-message"><div>Also IIRC, both of these limitations go away if you conform to RawRepresentable yourself.</div><div><br></div><div>There is no magic to RawRep. The compiler will just synthesise a failable initialiser and 'rawValue' computed property accessor. Both just simple switch statements matching your provided literals and returning the appropriate enum case.<br><br>Specifically, RawRep does not change the raw representation of the enum. It's always going to be the smaller integer that fits the number of cases.<br><style>#edo-signature img {max-width: 90%}</style><div id="edo-signature" style="font-family: 'Helvetica Neue','Helvetica',Helvetica,Arial,sans-serif;font:'-apple-system-body';"></div><br><div id="edo-link"></div></div></div><div id="edo-original"><div><br><br><blockquote type="cite" style="margin:1ex 0 0 0;border-left:1px #ccc solid;padding-left:0.5ex;"><div>On Oct 4, 2016 at 6:56 pm, <<a href="mailto:razielim@gmail.com">Karl Wagner</a>> wrote:<br><br></div><div><div id="edo-message"><div>Enum raw types don't have to be strings/integers, but they have to be expressable by string or integer literals. <span style="-webkit-tap-highlight-color: transparent; -webkit-text-size-adjust: auto;">We don't guarantee uniqueness per se, but we do check for duplicate literals and auto-increment integers to fill gaps.</span></div><div><div id="edo-link"></div></div></div><div id="edo-original"><div><br></div><div>So all you have to do is make your custom type conform to ExpressibleByStringLiteral and you can use it as an enum's raw type.</div><div><br></div><div>Karl</div><div><blockquote type="cite" style="margin:1ex 0 0 0;border-left:1px #ccc solid;padding-left:0.5ex;"><div>On Oct 3, 2016 at 9:50 pm, <<a href="mailto:swift-evolution@swift.org">Adrian Zubarev via swift-evolution</a>> wrote:<br><br></div><div><style>
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.error { color:#AA0000; }</style><div class="bloop_markdown"><p>Hi there,</p>
<p>I’m interested if this idea has some potential future in Swift or not.</p>
<p>Currently RawRepresentable enums accept only a subset of literal types like String, Character and the Integer family (<code>enum Name : String { … }</code>).</p>
<p>Sometimes this is not enough for my use-case and I wish I could feed my enums with other Hashable types!</p>
<p>As a workaround I can create a custom struct or even a class and conform it to <code>RawRepresentable</code> and fake an enum with some static variables (similar to what is done with <code>OptionSet</code> types).</p>
<p>The problem there is that I cannot use the same switch pattern matching like with enums. I’d wish either enums could accept Hashable types (maybe with some restriction) or the existence on a protocol to build custom enum-like types with strucs/classes and use the same switch pattern matching.</p>
<pre><code class="swift">struct A : Hashable { /* implement everything */ }
// Variant 1:
enum Test : A {
case something = A(rawValue: A(value: "something"))
case nothing = A(rawValue: A(value: "nothing"))
}
// Variant 2:
protocol SomeFancyName : RawRepresentable { … }
struct Test : SomeFancyName {
let rawValue: A
init?(rawValue: A) {
// Implement + reject unwanted `A`s
}
static let something = A(rawValue: A(value: "something"))
static let nothing = A(rawValue: A(value: "nothing"))
}
let value = Test.something
switch value {
case .something:
// handle
case .nothing:
// handle
// Because of `SomeFancyName` the switch can use enum-like pattern matching + does not need the `default` case when all cases are present
}
</code></pre>
<p></p></div><div class="bloop_original_html"><style>body{font-family:Helvetica,Arial;font-size:13px}</style><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div><br><div id="bloop_sign_1475522853802483200" class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div></div><div class="bloop_markdown"><p></p></div>_______________________________________________
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