go pointers
p := Vertex{1, 2} // p is a Vertex
q := &p // q is a pointer to a Vertex
r := &Vertex{1, 2} // r is also a pointer to a Vertex
// The type of a pointer to a Vertex is *Vertex
var s *Vertex = new(Vertex) // new creates a pointer to a new struct instancego pointers
& address of / create pointer
* dereference pointergo pointers
func main() {
i, j := 42, 2701
p := &i // point to i
fmt.Println(*p) // read i through the pointer
*p = 21 // set i through the pointer
fmt.Println(i) // see the new value of i
p = &j // point to j
*p = *p / 37 // divide j through the pointer
fmt.Println(j) // see the new value of j
}golang pointer
package main
import "fmt"
type Person struct {
Firstname string
Lastname string
}
func pointerParameter(fullname *string) {
*fullname = "john doe"
fmt.Println("passing data with pointer", *fullname)
}
func pointerStructParameter(person *Person) {
fmt.Println(*person)
}
func pointerStructParameterWithRetruning(person *Person) (pointer interface{}) {
pointer = *person
return pointer
}
func main() {
var fullname string
realNumber := 5
pointerNumber := &realNumber
number := pointerNumber
person := &Person{
Firstname: "john doe",
Lastname: "margareth",
}
var yearsPointer *int
years := &yearsPointer
pointerParameter(&fullname)
pointerStructParameter(person)
fmt.Println("real number", realNumber)
fmt.Println("pointer number", pointerNumber)
fmt.Printf("real number from pointer %vn", *number)
fmt.Println("nil pointer", *years)
fmt.Println("read pointer paramter with returning", pointerStructParameterWithRetruning(person))
}Copyright © 2021 Codeinu
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