Passing pointers to functions in Go
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小牛编辑
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2023-12-01
Go编程语言允许您传递指向函数的指针。 为此,只需将函数参数声明为指针类型即可。
在下面的示例中,我们传递两个指向函数的指针并更改函数内部的值,该值反映在调用函数中 -
package main
import "fmt"
func main() {
/* local variable definition */
var a int = 100
var b int = 200
fmt.Printf("Before swap, value of a : %d\n", a )
fmt.Printf("Before swap, value of b : %d\n", b )
/* calling a function to swap the values.
* &a indicates pointer to a ie. address of variable a and
* &b indicates pointer to b ie. address of variable b.
*/
swap(&a, &b);
fmt.Printf("After swap, value of a : %d\n", a )
fmt.Printf("After swap, value of b : %d\n", b )
}
func swap(x *int, y *int) {
var temp int
temp = *x /* save the value at address x */
*x = *y /* put y into x */
*y = temp /* put temp into y */
}
编译并执行上述代码时,会产生以下结果 -
Before swap, value of a :100
Before swap, value of b :200
After swap, value of a :200
After swap, value of b :100