18.5 接口
优质
小牛编辑
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2023-12-01
(1)如何检测一个值v
是否实现了接口Stringer
:
if v, ok := v.(Stringer); ok {
fmt.Printf("implements String(): %sn", v.String())
}
(2)如何使用接口实现一个类型分类函数:
func classifier(items ...interface{}) {
for i, x := range items {
switch x.(type) {
case bool:
fmt.Printf("param #%d is a booln", i)
case float64:
fmt.Printf("param #%d is a float64n", i)
case int, int64:
fmt.Printf("param #%d is an intn", i)
case nil:
fmt.Printf("param #%d is niln", i)
case string:
fmt.Printf("param #%d is a stringn", i)
default:
fmt.Printf("param #%d’s type is unknownn", i)
}
}
}