go - 如何读取 Go 中的嵌入式字段？

Question

我设计了一个新的Request结构，但是在某些场景下(http.Redirect)，我需要获取来源http.Request。

我的请求结构:

type Request struct {
    *http.Request
}

func (r *Request) IsGet() bool {
    return strings.EqualFold("GET", r.Method)
}

主要功能:

    req := http.Request{
        Method:"POST",
    }

    myReq := &Request{&req}

    // How to get original request.
    originalReq, ok := (interface{}(*myReq)).(http.Request);
    if ok {
        fmt.Printf("Method: %s\n", originalReq.Method)
    } else {
        fmt.Println("Failure")
    }

Answer 1

让我们看看是什么the language specification说:

The unqualified type name acts as the field name.

// A struct with four anonymous fields of type T1, *T2, P.T3 and *P.T4
struct {
  T1        // field name is T1
  *T2       // field name is T2
  P.T3      // field name is T3
  *P.T4     // field name is T4
  x, y int  // field names are x and y
}

即myReq.Request