Question

Using Go 1.11.x with the echo framework.

I have the following struct and function

type AccountController struct {
  ....
}

func (c *AccountController) ActiveAccountID() int {
  ....
  return 5
}

Now I want to access the ActiveAccountID from another struct, this is how i did it,

type TestController struct {
   Account *AccountController
}

func (c *TestController) AddData(ec echo.Context) error {
  ....
  id := c.Account.ActiveAccountID()     
  ....
}

But when I print / use the id var, it just gives me a memory pointer error?

I have tried the account controller to remove the pointer but i still got the memory pointer issue. So what am I doing wrong?

Thanks,

Answer 1

注意结构的结构

type TestController struct {
   Account *AccountController
}

帐户是一个指针。它已初始化为nil，因此，如果您从未将其设置为指向某个东西，它将始终为nil，并且当您尝试像这样对它调用方法时，将收到nil指针解除引用错误

// c *TestController
c.Account.ActiveAccountID()

设置方式/时间取决于您的用例。

还可以根据您的用例将其从指针更改为嵌入式结构

type TestController struct {
   Account AccountController
}

这样，它始终位于结构内部，但是如果您从其他位置进行分配，它将被复制。根据您的用例，这可能是不希望的。

Accessing Function On Another Struct

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