Golang地图关键点指向地址值

How can I define a map, where the key points to an address of a struct?

i.e.

type A struct {
   id int
}

sessions = make(map[int]&A)
first := &A{6}
sessions[0] = first

Almost all in your code is fine, you only use a wrong declaration of pointer:

sessions := make(map[int]*A)
first := A{6}
sessions[0] = &first

https://play.golang.org/p/6d-Xgw1NOrF

struct pointers can be achived by with a * before type as said here:

PointerType = "*" BaseType .

so:

sessions = make(map[int]*A) is the answer