问题

以下是翻译好的内容：

type Animal struct {
    Name string
    LegCount int
}

snake := Animal{Name: "snake", LegCount: 0}
worm := Animal{Name: "worm"}

问题： 我如何在设置了snake和worm之后检查它们，以确定：

英文:

type Animal struct {
    Name string
    LegCount int
}

snake := Animal{Name: &quot;snake&quot;, LegCount: 0}
worm := Animal{Name: &quot;worm&quot;}

Question: How can I check snake and worm after they've been set, to tell that:

snake was explicitly set with a LegCount of 0.
The worm's LegCount was not explicitly set (and therefore based off of its default value)?

答案1

得分: 12

这是翻译好的内容：

这是不可能区分的。

如果你正在从XML或JSON中解组数据，请使用指针。

type Animal struct {
    Name *string
    LegCount *int
}

对于不存在的字段，你将得到nil值。

你可以在你的情况下使用相同的约定。

英文:

It is simply impossible to distinguish.

If you are unmarshalling data from XML or JSON, use pointers.

type Animal struct {
    Name *string
    LegCount *int
}

You will get nil values for absent fields.

You can use the same convention in your case.

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