Introduzione alle Generics in Go - DevFest GDG

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Descrizione. In questo talk introdurremo le generics del Go 1.18 e vedremo alcuni pattern ed anti-pattern del loro utilizzo.

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Setup

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Go

There is a Makefile with various utilities for running, build and decompiling the Go examples.

# Show usage
$ make

# Run/build/decomp examples
$ make run-<subproject> 
$ make compile-<subproject> 
$ make compile-noinline-<subproject> 
$ make decomp-<subproject> 
$ make decomp-noinline-<subproject> 

---

Extra: Per chi non sa cosa sono le interfacce leggere prima questo

type Circle struct {
    Radius float64
}
type Rectangle struct {
    Width, Height float64
}

type Shape interface {
    Area() float64
    Perimeter() float64
}

func (c Circle) Area() float64 {
    return c.Radius * c.Radius * math.Pi
}
func (c Circle) Perimeter() float64 {
    return 2 * c.Radius * math.Pi
}
func (c Circle) Curvature() float64 {
    return 1 / c.Radius
}

func (r Rectangle) Area() float64 {
    return r.Width * r.Height
}
func (r Rectangle) Perimeter() float64 {
    return 2 * r.Radius * math.Pi
}
func (r Rectangle) CornerCount() int {
    if (r.Width == 0 && r.Height == 0) { return 0 }
    if (r.Width == 0 || r.Height == 0) { return 2 }
    return 4
}

func AreaOverPerimeter(s Shape) float64 {
    return s.Area() / s.Perimeter()
}

// c1 := Circle{ Radius: 5.0 }
c1 := Circle{ 5.0 }

// r1 := Rectangle{ Width: 2.0, Height: 3.0 }
r1 := Rectangle{ 2.0, 3.0 }

AreaOverPerimeter(c1)
AreaOverPerimeter(r1)