比较 Golang 中的指针

Go 编程语言或 Golang 中的指针是一个变量，用于存储另一个变量的内存地址。 Golang 中的指针也称为特殊变量。这些变量用于在系统中的特定内存地址存储一些数据。内存地址总是以十六进制格式（以 0x 开头，如 0xFFAAF 等）。
在 Go 语言中，你可以比较两个指针。两个指针的值仅在它们指向内存中的相同值或为零时才相等。您可以借助 Go 语言提供的==和!=运算符对指针进行比较：

1. ==运算符：如果两个指针都指向同一个变量，则此运算符返回 true。或者，如果两个指针都指向不同的变量，则返回 false。

句法：

pointer_1 == pointer_2

例子：

// Go program to illustrate the
// concept of comparing two pointers
package main
  
import "fmt"
  
func main() {
  
    val1 := 2345
    val2 := 567
  
    // Creating and initializing pointers
    var p1 *int
    p1 = &val1
    p2 := &val2
    p3 := &val1
  
    // Comparing pointers 
    // with each other
    // Using == operator
    res1 := &p1 == &p2
    fmt.Println("Is p1 pointer is equal to p2 pointer: ", res1)
  
    res2 := p1 == p2
    fmt.Println("Is p1 pointer is equal to p2 pointer: ", res2)
  
    res3 := p1 == p3
    fmt.Println("Is p1 pointer is equal to p3 pointer: ", res3)
  
    res4 := p2 == p3
    fmt.Println("Is p2 pointer is equal to p3 pointer: ", res4)
  
    res5 := &p3 == &p1
    fmt.Println("Is p3 pointer is equal to p1 pointer: ", res5)
}

输出：

Is p1 pointer is equal to p2 pointer:  false
Is p1 pointer is equal to p2 pointer:  false
Is p1 pointer is equal to p3 pointer:  true
Is p2 pointer is equal to p3 pointer:  false
Is p3 pointer is equal to p1 pointer:  false

2. !=运算符：如果两个指针都指向同一个变量，则此运算符返回 false。或者如果两个指针都指向不同的变量，则返回 true。

句法：

pointer_1 != pointer_2

例子：

// Go program to illustrate the 
// concept of comparing two pointers
package main
  
import "fmt"
  
func main() {
  
    val1 := 2345
    val2 := 567
  
    // Creating and initializing pointers
    var p1 *int
    p1 = &val1
    p2 := &val2
    p3 := &val1
  
    // Comparing pointers
    // with each other
    // Using != operator
    res1 := &p1 != &p2
    fmt.Println("Is p1 pointer not equal to p2 pointer: ", res1)
  
    res2 := p1 != p2
    fmt.Println("Is p1 pointer not equal to p2 pointer: ", res2)
  
    res3 := p1 != p3
    fmt.Println("Is p1 pointer not equal to p3 pointer: ", res3)
  
    res4 := p2 != p3
    fmt.Println("Is p2 pointer not equal to p3 pointer: ", res4)
  
    res5 := &p3 != &p1
    fmt.Println("Is p3 pointer not equal to p1 pointer: ", res5)
}

输出：

Is p1 pointer not equal to p2 pointer:  true
Is p1 pointer not equal to p2 pointer:  true
Is p1 pointer not equal to p3 pointer:  false
Is p2 pointer not equal to p3 pointer:  true
Is p3 pointer not equal to p1 pointer:  true