sorting - Golang Sort :does not implement sort. 接口(interface)(缺少 Len 方法)

Question

我在我的 Go 应用程序中实现排序界面时遇到问题。这是相关代码:

type Group struct {
   Teams []*Team
}

type Team struct {
    Points int
 }

    type Teams []*Team

            func (slice Teams) Len() int {
                return len(slice)
            }

            func (slice Teams) Less(i, j int) bool {
                return slice[i].Points < slice[j].Points
            }

            func (slice Teams) Swap(i, j int) {
                slice[i], slice[j] = slice[j], slice[i]
            }

所以我想根据他们的分数对小组的团队进行排序。但每当我运行时

sort.Sort(group.Teams)

我收到这个错误:

 cannot use group.Teams (type []*Team) as type sort.Interface in argument
to sort.Sort:   []*Team does not implement sort.Interface (missing Len
method)

这是为什么？

Answer 1

[]*Team 与 Teams 不同；您需要明确使用或强制转换为后者:

type Group struct {
   Teams Teams
}
sort.Sort(group.Teams)

或者:

type Group struct {
   Teams []*Team
}
sort.Sort(Teams(group.Teams))