英文:
Passing struct field parameters to a function
问题
我有一个Message结构体和一个创建新Message并对其进行操作的函数。
type Message struct {
To string
From string
Body string
}
func Message() {
newMessage := Message{Body: "test"}
// 对newMessage进行操作
}
我想将结构体的参数传递给函数，就像这样（显然语法上不正确，但你能理解我的意思）。
func Message(/*params*/) {
newMessage := Message{/*params*/}
// 对newMessage进行操作
}
问题是，结构体参数本身没有类型，所以无法直接将它们传递给函数。我可以给函数传递一个map，并从中获取参数，但我希望保持message函数尽可能简单，避免像这样的操作：
Message(Message{/*params*/})
和
var params map[string]string
// 设置参数
Message(params)
英文:
I have a Message struct, and a function that creates a new Message and does something with it.
type Message struct {
To string
From string
Body string
}
func Message() {
newMessage := Message{Body: "test"}
// do something with newMessage
}
I'd like to pass the parameters to the struct into the function, kind of like this (obviously not syntactically correct, but you get the gist).
func Message(/*params*/) {
newMessage := Message{/*params*/}
// do something with newMessage
}
The problem is, struct parameters themselves don't have a type, so there's no way to give them directly to a function. I could probably give the function a map, and get the parameters out of there, but I want to keep using the message function as simple as possible, avoiding things like this:
Message(Message{/*params*/})
and
var params map[string]string
// set parameters
Message(params)
答案1
得分: 1
你想要实现什么目标？为什么结构参数本身没有类型？这段代码有什么问题？
package main
import "fmt"
type Message struct {
To string
From string
Body string
}
func NewMessage(to, from, body string) *Message {
message := &Message{
To: to,
From: from,
Body: body,
}
// 对 message 进行一些操作
return message
}
func main() {
message := NewMessage(
"message to",
"message from",
"message body",
)
fmt.Println("Message: ", *message)
}
输出结果：
Message: {message to message from message body}
英文:
What exactly are you trying to accomplish? Why don't struct parameters themselves have a type. What is wrong with this?
package main
import "fmt"
type Message struct {
To string
From string
Body string
}
func NewMessage(to, from, body string) *Message {
message := &Message{
To: to,
From: from,
Body: body,
}
// do something with message
return message
}
func main() {
message := NewMessage(
"message to",
"message from",
"message body",
)
fmt.Println("Message: ", *message)
}
Output:
Message: {message to message from message body}
答案2
得分: 0
直接传递一条消息：
func Send(msg Message) {
// 处理消息
}
Send(Message{"to", "from", "body"})
如果你需要初始化其他属性，可以这样做：
type Message struct {
id int
To string
From string
Body string
}
func (this *Message) init() {
if this.id == 0 {
this.id = 1 // 在这里生成一个id
}
}
func Send(msg Message) {
msg.init()
// 处理消息
}
Send(Message{
To: "to",
From: "from",
Body: "body",
})
不过，没有更多信息的情况下很难确定最佳方法。
英文:
Just pass in a message directly:
func Send(msg Message) {
// do stuff with msg
}
Send(Message{"to","from","body"})
If there are additional properties you need to initialize you can do it like this:
type Message struct {
id int
To, From, Body string
}
func (this *Message) init() {
if this.id == 0 {
this.id = 1 // generate an id here somehow
}
}
func Send(msg Message) {
msg.init()
// do stuff with msg
}
Send(Message{
To: "to",
From: "from",
Body: "body",
})
Though it's hard to know the best approach without more information.
答案3
得分: -1
我认为你想要这样的东西，但这在Golang中不是有效的样式。
<i>
消息（收件人：'Ray'，发件人：'Jack'）
</i>
英文:
I think you want sth like this, but it's not valid style in Golang.
<i>
Message(To:'Ray',From:'Jack')
</i>
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