如何检查是否在结构中设置了属性 [英] How check if a property was set in a struct

问题描述

我试图找到如何检查是否设置了结构属性，但找不到任何方法.

I am trying to find how check if a structure property was set, but i cannot find any way.

我希望像这样，但实际上这是行不通的:

I expect something like this but of corse this not works:

type MyStruct struct {
    property    string
}

test := new(MyStruct)
if test.property {
    //do something with this
}

推荐答案

就像dyoo所说，如果您的struct属性是指针，则可以使用nil.如果要将它们保留为字符串，可以与""进行比较.这是一个示例:

Like dyoo said, you can use nil if your struct properties are pointers. If you want to keep them as strings you can compare with "". Here is a sample:

package main

import "fmt"

type MyStruct struct {
    Property string
}

func main() {
    s1 := MyStruct{
        Property: "hey",
    }

    s2 := MyStruct{}

    if s1.Property != "" {
        fmt.Println("s1.Property has been set")
    }

    if s2.Property == "" {
        fmt.Println("s2.Property has not been set")
    }
}

http://play.golang.org/p/YStKFuekeZ

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