golang判斷結構體為空

The size of an empty structure is zero in Golang. Here, empty structure means, there is no field in the structure.

在Golang中， 空結構的大小為零。 在此， 空結構表示該結構中沒有字段。

Eg:

例如：

Type structure_name struct {}

There are many ways to check if structure is empty. Examples are given below.

有很多方法可以檢查結構是否為空 。 示例如下。

Example 1:

范例1：

package mainimport ("fmt" )type Person struct {}func main() {var st Personif (Person{} == st) {fmt.Println("It is an empty structure")} else {fmt.Println("It is not an empty structure")} } It is an empty structure

Example 2:

范例2：

package mainimport ("fmt" )type Person struct {age int }func main() {var st Personif (Person{20} == st) {fmt.Println("It is an empty structure")} else {fmt.Println("It is not an empty structure")} } It is not an empty structure

If a structure has fields, then how to check whether structure has been initialised or not?

如果結構具有字段，那么如何檢查結構是否已初始化？

Please follow given below examples...

請遵循以下示例...

Syntax:

句法：

Type structure_name struct {variable_name type}

Example 1:

范例1：

package mainimport ("fmt""reflect" )type Person struct {age int }func (x Person) IsStructureEmpty() bool {return reflect.DeepEqual(x, Person{}) }func main() {x := Person{}if x.IsStructureEmpty() {fmt.Println("Structure is empty")} else {fmt.Println("Structure is not empty")} }

Output

輸出量

Structure is empty

Example 2:

范例2：

package mainimport ("fmt""reflect" )type Person struct {age int }func (x Person) IsStructureEmpty() bool {return reflect.DeepEqual(x, Person{}) }func main() {x := Person{}x.age = 20if x.IsStructureEmpty() {fmt.Println("Structure is empty")} else {fmt.Println("Structure is not empty")} }

Output

輸出量

Structure is not empty

Using switch statement

使用switch語句

Example 1:

范例1：

package mainimport ("fmt" )type Person struct { }func main() {x := Person{}switch {case x == Person{}:fmt.Println("Structure is empty")default:fmt.Println("Structure is not empty")} }

Output

輸出量

Structure is empty

Example 2:

范例2：

package mainimport ("fmt" )type Person struct {age int }func main() {x := Person{}switch {case x == Person{1}:fmt.Println("Structure is empty")default:fmt.Println("Structure is not empty")} }

Output

輸出量

Structure is not empty

翻譯自: https://www.includehelp.com/golang/how-to-check-if-structure-is-empty.aspx

golang判斷結構體為空

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