Analysis of the problem of not being able to obtain the address in golang

The code example is as follows:

func main() {
    var a Integer = 1
    var b Integer = 1
    sum := a.Add(b)
    fmt.Println(sum)

    var i interface{} = a
    sum = i.(Integer).Add(b) // 报错
    fmt.Println(sum)
}

type Integer int

func (a *Integer) Add(b Integer) Integer {
    return  *a + b
}

The error message is as follows:

test\testVar.go:16:19: cannot call pointer method on i.(Integer)
test\testVar.go:16:19: cannot take the address of i.(Integer)

This happens because the Add method requires an Integer pointer type The receiver, and the i.(Integer) we passed is a value, and this value is not assigned to any variable, so the symbol "&" cannot get the address.

The correct way is to assign i.(Integer) to a variable, or change the method receiver to a normal type.

Code examples are as follows:

   var i interface{} = a
    c := i.(Integer)
    sum = c.Add(b)
    fmt.Println(sum)

or

func (a Integer) Add(b Integer) Integer {    
return  a + b
}

Recommended related articles and tutorials: golang tutorial

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