Machen Sie ein Beispiel
var p *[]int = new([]int)
or
p := new([]int)
Restu Wahyu Saputra
var p *[]int = new([]int)
or
p := new([]int)func main() {
// OK:
ch := make(chan string)
go sendData(ch)
go getData(ch)
time.Sleep(1e9)
// NOT OK:
ch := new(chan string)
go sendData(ch) // cannot use ch (variable of type *chan string)
// as chan string value in argument to sendData
go getData(ch)
time.Sleep(1e9)
}
func sendData(ch chan string) {
ch <- "Washington"
ch <- "Tripoli"
ch <- "London"
ch <- "Beijing"
ch <- "Tokio"
}
func getData(ch chan string) {
var input string
for {
input = <-ch
fmt.Printf("%s ", input)
}
}
package main
type Foo map[string]string
type Bar struct {
s string
i int
}
func main() {
// OK:
y := new(Bar)
(*y).s = "hello"
(*y).i = 1
// NOT OK:
z := make(Bar) // compile error: cannot make type Bar
z.s = "hello"
z.i = 1
// OK:
x := make(Foo)
x["x"] = "goodbye"
x["y"] = "world"
// NOT OK:
u := new(Foo)
(*u)["x"] = "goodbye" // !!panic!!: runtime error:
// assignment to entry in nil map
(*u)["y"] = "world"
}