Open Radar

 
Summary:
Enum type iteration could be aided by predecessor and successor instance methods and/or an allValues class method.

Consider an enum defined as follows

`enum SomeEnum : Int {
    case Foo = 0
    case Bar
    case Baz = 34
}`

A simple and safe way to iterate through all valid enum values does not exist without hard coding an array somewhere in our code. Providing a built in means to accomplish this would be a cherry on top of an already potent enum type.

Steps to Reproduce:
let myVal1:SomeEnum = .Foo
let myVal2 = myVal1.pred // pred should return (optional<SomeEnum>)
myVal2 //  should evaluate to SomeEnum.Bar

let myVal3 = myVal1.succ // succ should also return (optional<SomeEnum>)
myVal3 //  should evaluate to SomeEnum.Foo

let allValues = SomeEnum.allValues() // should return [Foo, Bar, Baz]

Expected Results:
let myVal1:SomeEnum = .Foo
let myVal2 = myVal1.pred // pred should return (optional<SomeEnum>)
myVal2

let myVal3 = myVal1.succ // succ should also return (optional<SomeEnum>)
myVal3

let allValues = SomeEnum.allValues()  // should return SomeEnum[]
allValues 

Actual Results:
let myVal1:SomeEnum = .Foo
let myVal2 = myVal1.pred // pred should return (optional<SomeEnum>)
myVal2 // should evaluate to SomeEnum.Bar

let myVal3 = myVal1.succ // succ should also return (optional<SomeEnum>)
myVal3 // should evaluate to SomeEnum.Foo

let allValues = SomeEnum.allValues()  // should return SomeEnum[]
allValues  // should evaluate to [SomeEnum.Foo, SomeEnum.Bar, SomeEnum.Baz]

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