英文:
Initializing embedded struct when no control over parent initialization
问题
我有一个这样的结构体：
type Parent struct {
*WithContext
}
type WithContext struct {
Ctx context.Context
}
func (wi *WithContext) SetContext(ctx context.Context) {
// 空指针
wi.Ctx = ctx
}
Parent是通过某个自动化过程（作为解组流程的一部分）进行初始化的，所以我无法初始化嵌入的WithContext结构体。
有没有办法避免在'SetContext'函数中出现空指针？我尝试重写指针接收器，但没有任何效果。
谢谢，
Asaf.
英文:
I have a struct such:
type Parent struct {
*WithContext
}
type WithContext struct {
Ctx context.Context
}
func (wi *WithContext) SetContext(ctx context.Context) {
// nil pointer
wi.Ctx = ctx
}
Parent is initialized by some automated process (as apart of unmarshalling flow), so I cannot initialize the embedded WithContext struct,
Is there any way to avoid the nil pointer in the 'SetContext' func ? I tried overriding the pointer receiver but it doesn't have any effect,
Thanks,
Asaf.
答案1
得分: 1
理想情况下，构造Parent结构的任何内容都应该初始化它，使其处于可用状态。但由于您无法控制它，下一个最好的方法是编写一段代码，让您可以设置Parent中的WithContext指针，可以通过在Parent上提供一个成员函数或者在应用程序中提供一段代码来设置它，因为WithContext字段是公开的。
英文:
Ideally, whatever is constructing the Parent struct should initialize it so it's in a usable state. But since you have no control over it, the next best thing is to have a piece of code that lets you set the WithContext pointer in Parent, by providing a member function on Parent or just a piece of code in your application to set it, since WithContext field is exported.
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