英文:
Correctly pass struct to function in golang
问题
我有一个Go语言的结构体：
type Connection struct {
Write chan []byte
Quit chan bool
}
我用以下方式创建它：
newConnection := &Connection{make(chan []byte), make(chan bool)}
如何正确创建带有Connection参数和该类型函数的函数类型？
我的意思是我想做这样的事情：
type Handler func(string, Connection)
和
handler(line, newConnection)
其中handler是：
func handler(input string, conn tcp.Connection) {}
无法将newConnection（类型为*Connection）作为参数传递给handler。
谢谢。
英文:
I have a golang structure:
type Connection struct {
Write chan []byte
Quit chan bool
}
I'm creating it with:
newConnection := &Connection{make(chan []byte), make(chan bool)}
How to correctly create functional type with Connection parameter and function of this type?
I mean that i want to do something like this:
type Handler func(string, Connection)
and
handler(line, newConnection)
whene handler is:
func handler(input string, conn tcp.Connection) {}
cannot use newConnection (type *Connection) as type Connection in argument to handler
Thank you.
答案1
得分: 5
问题是Handler的类型是Connection，而你传递的值的类型是*Connection，即指向Connection的指针。
将处理程序的定义更改为*Connection类型。
这是一个可工作的示例：
package main
import "fmt"
type Connection struct {
Write chan []byte
Quit chan bool
}
type Handler func(string, *Connection)
func main() {
var myHandler Handler
myHandler = func(name string, conn *Connection) {
fmt.Println("Connected!")
}
newConnection := &Connection{make(chan []byte), make(chan bool)}
myHandler("input", newConnection)
}
https://play.golang.org/p/8H2FocX5U9
英文:
the Problem is that the type of Handler is Connection and the value that you are passing is of type *Connection, i.e. Pointer-to-Connection.
Change the handler definition to be of type *Connection
Here is a working Example:
package main
import "fmt"
type Connection struct {
Write chan []byte
Quit chan bool
}
type Handler func(string, *Connection)
func main() {
var myHandler Handler
myHandler = func(name string, conn *Connection) {
fmt.Println("Connected!")
}
newConnection := &Connection{make(chan []byte), make(chan bool)}
myHandler("input", newConnection)
}
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