On Fri, Oct 13, 2017 at 5:41 AM, Cholerae Hu <cholerae...@gmail.com> wrote:
> package main
>
> import (
> "fmt"
> "reflect"
> )
>
> type Circle struct {
> radius float64
> }
>
> func (c *Circle) DummyMethod() {
> fmt.Println("Type of receiver:", reflect.TypeOf(c))
> }
>
> func main() {
> // error: cannot take the address of Circle literal
> // Circle{radius: 1.0}.DummyMethod()
> (&Circle{radius: 1.0}).DummyMethod()
> }
>
> https://golang.org/ref/spec#Calls
>>
>> If x is addressable and &x's method set contains m, x.m() is shorthand
>> for (&x).m()
>
>
> https://golang.org/ref/spec#Address_operators
> Composite literals is addressable.
>
> So why can't I call DummyMethod like Circle{radius: 1.0}.DummyMethod() ?
Composite literals are not addressable. The section of the spec you
are citing lists the addressable objects and then says that, as an
exception, the address operator '&' may be applied to a composite
literal even though they are not addressable.
Ian
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