What is the difference between ordinary functions and methods in go language?

Difference: For ordinary functions, when the receiver is a value type, pointer type data cannot be passed directly, and vice versa; for methods, when the receiver is a value type, it can be called directly with a pointer type variable. method, and the reverse is also possible.

The operating environment of this article: windows10 system, Go 1.11.2, thinkpad t480 computer.

Related recommendations: "Go Video Tutorial"

The difference between ordinary functions and methods in Go language

1. Ordinary functions cannot pass pointer type data directly when the receiver is a value type, and vice versa.

2. For methods (such as struct methods), when the receiver is a value type, you can directly call the method using a pointer type variable, and vice versa.

The following is a simple example:

package structTest  
  
//普通函数与方法的区别（在接收者分别为值类型和指针类型的时候）  
//Date：2014-4-3 10:00:07  
  
import (  
    "fmt"  
)  
  
func StructTest06Base() {  
    structTest0601()  
    structTest0602()  
}  
  
//1.普通函数  
//接收值类型参数的函数  
func valueIntTest(a int) int {  
    return a + 10  
}  
  
//接收指针类型参数的函数  
func pointerIntTest(a *int) int {  
    return *a + 10  
}  
  
func structTest0601() {  
    a := 2  
    fmt.Println("valueIntTest:", valueIntTest(a))  
    //函数的参数为值类型，则不能直接将指针作为参数传递  
    //fmt.Println("valueIntTest:", valueIntTest(&a))  
    //compile error: cannot use &a (type *int) as type int in function argument  
  
    b := 5  
    fmt.Println("pointerIntTest:", pointerIntTest(&b))  
    //同样，当函数的参数为指针类型时，也不能直接将值类型作为参数传递  
    //fmt.Println("pointerIntTest:", pointerIntTest(b))  
    //compile error:cannot use b (type int) as type *int in function argument  
}  
  
//2.方法  
type PersonD struct {  
    id   int  
    name string  
}  
  
//接收者为值类型  
func (p PersonD) valueShowName() {  
    fmt.Println(p.name)  
}  
  
//接收者为指针类型  
func (p *PersonD) pointShowName() {  
    fmt.Println(p.name)  
}  
  
func structTest0602() {  
    //值类型调用方法  
    personValue := PersonD{101, "Will Smith"}  
    personValue.valueShowName()  
    personValue.pointShowName()  
  
    //指针类型调用方法  
    personPointer := &PersonD{102, "Paul Tony"}  
    personPointer.valueShowName()  
    personPointer.pointShowName()  
  
    //与普通函数不同，接收者为指针类型和值类型的方法，指针类型和值类型的变量均可相互调用  
}

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