golang判断结构体为空_如何在Golang中检查结构是否为空？

golang判断结构体为空

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

在Golang中， 空结构的大小为零。 在此， 空结构表示该结构中没有字段。

Eg:

例如：

<pre><code class="has"> Type structure_name struct { } </code> </pre>

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

有很多方法可以检查结构是否为空 。 示例如下。

Example 1:

范例1：

<pre><code class="has">package main import ( "fmt" ) type Person struct { } func main() { var st Person if (Person{} == st) { fmt.Println("It is an empty structure") } else { fmt.Println("It is not an empty structure") } } </code> </pre> <pre><code class="has">It is an empty structure </code> </pre>

Example 2:

范例2：

<pre><code class="has">package main import ( "fmt" ) type Person struct { age int } func main() { var st Person if (Person{20} == st) { fmt.Println("It is an empty structure") } else { fmt.Println("It is not an empty structure") } } </code> </pre> <pre><code class="has">It is not an empty structure </code> </pre>

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

如果结构具有字段，那么如何检查结构是否已初始化？

Please follow given below examples...

请遵循以下示例...

Syntax:

句法：

<pre><code class="has"> Type structure_name struct { variable_name type } </code> </pre>

Example 1:

范例1：

<pre><code class="has">package main import ( "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") } } </code> </pre>

Output

输出量

<pre><code class="has">Structure is empty </code> </pre>

Example 2:

范例2：

<pre><code class="has">package main import ( "fmt" "reflect" ) type Person struct { age int } func (x Person) IsStructureEmpty() bool { return reflect.DeepEqual(x, Person{}) } func main() { x := Person{} x.age = 20 if x.IsStructureEmpty() { fmt.Println("Structure is empty") } else { fmt.Println("Structure is not empty") } } </code> </pre>

Output

输出量

<pre><code class="has">Structure is not empty </code> </pre>

Using switch statement

使用switch语句

Example 1:

范例1：

<pre><code class="has">package main import ( "fmt" ) type Person struct { } func main() { x := Person{} switch { case x == Person{}: fmt.Println("Structure is empty") default: fmt.Println("Structure is not empty") } } </code> </pre>

Output

输出量

<pre><code class="has">Structure is empty </code> </pre>

Example 2:

范例2：

<pre><code class="has">package main import ( "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") } } </code> </pre>

Output

输出量

<pre><code class="has">Structure is not empty </code> </pre> <blockquote>

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

</blockquote>

golang判断结构体为空