Class Cluster

Cluster.swift

class Number /* class cluser */ {
    class Int8: Number {
        var value: Swift.Int8
        init(_ value: Swift.Int8) { self.value = value }
    }
    class Int: Number {
        var value: Swift.Int
        init(_ value: Swift.Int) { self.value = value }
    }
    class Float: Number {
        var value: Swift.Float
        init(_ value: Swift.Float) { self.value = value }
    }
}

private protocol _Number {} /* Hack to allow self assingment */
extension Number: _Number {}
extension _Number {
    init(_ value: Int) {
        if let smallValue = Int8(exactly: value) {
            self = Number.Int8(smallValue) as! Self
        } else {
            self = Number.Int(value) as! Self
        }
    }
    init(_ value: Float) {
        self = Number.Float(value) as! Self
    }
}

print(type(of: Number(2)))     // -> Int8
print(type(of: Number(10000))) // -> Int
print(type(of: Number(7.5)))   // -> Float