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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