英文:
Golang passing a variable by reference to a structure member value
问题
我遇到了一个问题，无法通过引用或传递指针将值传递给结构体。我将概述我想要实现的内容：
type FooStruct struct {
foo1, foo2, foo3 int //等等
connection *net.Conn
}
func (session FooStruct) Run(conn *net.Conn) {
session.connection = conn
session.connection.RemoteAddr()
......
}
func main() {
server, err := net.Listen("tcp", ":8484")
connection, err := server.Accept()
foo := FooStruct{}
foo.Run(&connection)
}
上面是我尝试实现的示例，我只想将一个引用指针传递给结构体中的connection变量。我尝试阅读文档和教程，但我感到困惑。
在编译时，我收到错误消息- session.connection.RemoteAddr未定义（*net.Conn类型没有RemoteAddr字段或方法）。当复制变量时，它确实有效。但这不是我想要做的。
英文:
I am having difficulties passing a value to a struct by reference or by passing a pointer. I will outline what I am trying to achieve:
type FooStruct struct {
foo1, foo2, foo3 int //etc
connection *net.Conn
}
func(session FooStruct) Run(conn *net.Conn) {
session.connection = conn
session.connection.RemoteAddr()
......
}
func main() {
server, err := net.Listen("tcp", ":8484")
connection, err := server.Accept()
foo := FooStruct{}
foo.Run(&connection)
}
The above is an example of what I am trying to achive I only want to pass a reference pointer to the connection variable in the struct. I have tried reading the documentation and going through the tutorial but I have become confused.
When compiling I get the error - session.connection.RemoteAddr undefined (type * net.Conn has no field or method RemoteAddr). It does have that method as when copying the variable it works fine. However that is not what I want to do.
答案1
得分: 11
由于net.Conn是一个接口而不是一个结构体，你应该直接传递和存储它。像这样：
type FooStruct struct {
foo1, foo2, foo3 int
connection net.Conn
}
func (session *FooStruct) Run(conn net.Conn) {
session.connection = conn
session.connection.RemoteAddr()
}
func main() {
server, err := net.Listen("tcp", ":8484")
connection, err := server.Accept()
foo := FooStruct{}
foo.Run(connection)
}
另请注意，我将Run方法的接收者更改为指针，这通常是你想要的。
另外，参考Go FAQ中关于将接口传递给指针的问题。
英文:
Since net.Conn is an interface, not a struct, you should pass and store it directly. Like this:
type FooStruct struct {
foo1, foo2, foo3 int
connection net.Conn
}
func(session *FooStruct) Run(conn net.Conn) {
session.connection = conn
session.connection.RemoteAddr()
}
func main() {
server, err := net.Listen("tcp", ":8484")
connection, err := server.Accept()
foo := FooStruct{}
foo.Run(connection)
}
See also the Go FAQ entry on passing interfaces to pointers.
Also note that I changed the receiver of the Run method to a pointer, which is generally what you want.
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