英文:
golang type array containing structs
问题
我正在尝试创建一个伪队列结构，并在其中插入作业结构。我做错了什么？
import "fmt"
type Job struct {
Type string
Url string
}
type Queue []Job
func main() {
var queue []Queue
job := Job{"test", "http://google.com"}
queue[0] = job
fmt.Println(queue)
}
上面的代码报错：
无法将类型为 Job 的 job 分配给类型为 Queue 的 queue[0]
英文:
I am trying to create a pseudo queue structure and insert jobs structs inside it. What am I doing wrong ?
import "fmt"
type Job struct {
Type string
Url string
}
type Queue [] Job
func main() {
var queue []Queue
job := Job{"test", "http://google.com"}
queue[0] = job
fmt.Println(queue)
}
The code above is throwing:
> cannot use job (type Job) as type Queue in assignment
答案1
得分: 5
我认为问题出在这里：
var queue []Queue
这里的queue是一个Queue的切片，或者说是一个Job的切片的切片。所以不可能将其第一个元素的值赋给Job。
尝试一下：
var queue Queue
英文:
I think problem is here:
var queue []Queue
Here queue is a slice of Queue or slice of slice of Job. So it's impossible to assign first its element value of Job.
Try:
var queue Queue
答案2
得分: 4
你不需要一个队列的切片，也不应该对一个空切片进行索引。
package main
import "fmt"
type Job struct {
Type string
Url string
}
type Queue []Job
func main() {
var q Queue
job := Job{"test", "http://google.com"}
q = append(q, job)
fmt.Println(q)
}
英文:
You don't need a slice of queues, and you should not index an empty slice.
package main
import "fmt"
type Job struct {
Type string
Url string
}
type Queue []Job
func main() {
var q Queue
job := Job{"test", "http://google.com"}
q = append(q, job)
fmt.Println(q)
}
答案3
得分: 0
[]TypeName 是 TypeName 类型的切片的定义。
就像它所说的那样：
var queue []Queue 是 Queue 类型实例的切片。
q := Queue{Job{"test", "http://google.com"}, Job{"test", "http://google.com"}}
显然这不是你想要的。你应该声明 var queue Queue：
var queue Queue
q := append(queue, Job{"test", "http://google.com"}, Job{"test", "http://google.com"})
英文:
[]TypeName is definition of slice of TypeName type.
Just as it said:
var queue []Queue is a slice of instances of type Queue.
q := Queue{Job{"test", "http://google.com"}, Job{"test", "http://google.com"}}
Definitely it is not what you want. Instead of it you should declare var queue Queue:
var queue Queue
q := append(queue, Job{"test", "http://google.com"}, Job{"test", "http://google.com"})
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