go语言之进阶篇值语义和引用语义
1、值语义和引用语义
示例:
package main import "fmt" type Person struct { name string //名字 sex byte //性别, 字符类型 age int //年龄 } //修改成员变量的值 //接收者为普通变量,非指针,值语义,一份拷贝 func (p Person) SetInfoValue(n string, s byte, a int) { p.name = n p.sex = s p.age = a fmt.Println("p = ", p) fmt.Printf("SetInfoValue &p = %p\n", &p) } //接收者为指针变量,引用传递 func (p *Person) SetInfoPointer(n string, s byte, a int) { p.name = n p.sex = s p.age = a fmt.Printf("SetInfoPointer p = %p\n", p) } func main() { s1 := Person{"go", 'm', 22} fmt.Printf("&s1 = %p\n", &s1) //打印地址 //值语义 // s1.SetInfoValue("mike", 'm', 18) // fmt.Println("s1 = ", s1) //打印内容 //引用语义 (&s1).SetInfoPointer("mike", 'm', 18) fmt.Println("s1 = ", s1) //打印内容 }
#执行结果:
&s1 = 0xc00005a400 SetInfoPointer p = 0xc00005a400 s1 = {mike 109 18}