Go basics: interface-related

Interface related

Package Main

Import ("FMT" "math")

Interface that defines the method

The value of the interface type must implement the method defined inside the

Type Abser interface{Abs () float64}

Type Myfloat float64

Type Vertex struct{X, Y float64}

Myfloat Implementing ABS Method

Func (f myfloat) Abs () float64 {

If f < 0{return float64 (-f)} return Float64 (f)}

*vertex Implementing ABS Method

Func (v *vertex) Abs () float64

{return math. SQRT (v.x*v.x + v.y*v.y)

}

Func describe (i interface{})

{FMT. Printf ("%v,%t\n", I, I)}

Func Main ()

{var A, B abser

F: = Myfloat (-math. SQRT2)

Fmt. Println ("======f=", F)

V: = vertex{3,4}

A = f fmt. Println ("======a.abs=", A.abs ())

b = &v FMT. Println ("======b.abs=", B.abs ())

Null interface, no method is developed to implement, can accept any type

var emptyinterface interface{}

Describe (emptyinterface)

Emptyinterface = 12

Describe (emptyinterface)

Emptyinterface = "Wolfan"

Describe (emptyinterface)

}

Go basics: interface-related