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@Anton3
Last active February 1, 2017 10:18
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// Feature 1: @mixin extension
struct Pizza {
var containsCheese: Bool
init(cheese: Bool) { ... }
func prepare() { print(self) }
}
struct Margherita {
var pizza: Pizza
init() { pizza = Pizza(cheese: true) }
}
@mixin(pizza) extension Margherita {
func prepare()
}
// Usage
let margherita = Margherita()
margherita.prepare() //=> Pizza(containsCheese: true)
mergherita.pizza.prepare() //=> Pizza(containsCheese: true)
margherita.containsCheese // error
margherita.pizza.containsCheese //=> true
margherita as Pizza // error
// Feature 2: @mixin structs
protocol Orderable {
func makeOrder()
func meetCourier()
}
// Mixin structs are not really types; they have requirements to be met in outer type
@mixin struct Pizza : Orderable {
func prepare() { makeOrder(); meetCourier() }
}
struct Margherita {
var pizza: Pizza
func makeOrder() { ... }
func meetCourier() { ... }
}
@mixin(pizza) extension Margherita {
func prepare()
}
// Example: diamond pattern, split base
struct A { ... }
struct B { var a: A }
@mixin(a) extension B { ... }
struct C { var a: A }
@mixin(a) extension C { ... }
struct D { var b: B; var c: C }
@mixin(b) extension D { ... }
@mixin(c) extension D { ... }
// Example: diamond pattern, shared base
struct A { ... }
protocol HasA { var a: A { get set } }
struct B : HasA { ... }
struct C : HasA { ... }
struct D { var a: A; var b: B; var c: C }
@mixin(a) extension D { ... }
@mixin(b) extension D { ... }
@mixin(c) extension D { ... }
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