[swift-evolution] [Proposal] Random Unification

[Félix Cloutier]

> Le 4 oct. 2017 à 19:26, Xiaodi Wu via swift-evolution <swift-evolution at swift.org> a écrit :
> To sum up my thoughts so far in code, building on previous comments from others, this would be a nice set of random APIs, IMO:
> 
> ```
> extension Int {
>   static func random(in range: Countable{Closed}Range<Int>) -> Int
> }
> // And similar for other concrete built-in integer types.
> //
> // Since fixed-width integers could exceed the maximum size supported by getrandom()
> // and other such functions, we do not provide a default implementation.
> //
> // The return value may not be cryptographically secure if there is insufficient entropy.

I don't think that we should limit implementations based on that. If it's not an issue for `random(byteCount:)`, then it shouldn't be an issue for FixedWidthInteger.

(Also, I know that getrandom has a threshold where it becomes interruptible, but I'm not aware of an actual maximum size.)

> 
> extension Float {
>   static func random(in range: {Closed}Range<Float>) -> Float
> }
> 
> extension Double {
>   static func random(in range: {Closed}Range<Double>) -> Double
> }
> 
> extension Float80 {
>   // Ditto.
> }
> 
> extension Data {
>   static func random(byteCount: Int) -> Data
> }
> 
> extension UnsafeMutableRawPointer {
>   func copyRandomBytes(count: Int) throws
> }
> // This function is to be the most primitive of the random APIs, and will throw if there is insufficient entropy.
> 
> extension UnsafeMutableRawBufferPointer {
>   func copyRandomBytes() throws
> }
> // Just as UMRBP.copyBytes(from:) parallels UMRP.copyBytes(from:count:), we offer this convenience here.

What happened to the collection-based random functions? I'm not incredibly attached to them, but it doesn't seem to me that anyone has explicitly willed them away and I just want to be sure that it's not an oversight.

Félix

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