英文:
Passing in a type variable into function
问题
我正在尝试通过将类型传递给函数来实现类型断言。换句话说，我想要实现类似于以下代码的功能：
// 注意，这只是伪代码，因为 Type 不是在这里使用的有效类型
func myfunction(mystring string, mytype Type) {
...
someInterface := translate(mystring)
object, ok := someInterface.(mytype)
... // 做其他事情
}
func main() {
// 我希望函数的使用方式
myfunction("hello world", map[string]string)
}
在 myfunction 中，我需要使用什么样的函数声明才能成功执行类型断言？
英文:
I'm trying to achieve a type assertion by passing in a type into a function. In other words, I'm trying to achieve something like this:
// Note that this is pseudocode, because Type isn't the valid thing to use here
func myfunction(mystring string, mytype Type) {
...
someInterface := translate(mystring)
object, ok := someInterface.(mytype)
... // Do other stuff
}
func main() {
// What I want the function to be like
myfunction("hello world", map[string]string)
}
What's the proper function declaration I need to use in myfunction, to successfully perform the type assertion in myfunction?
答案1
得分: 6
嘿，如果我正确理解你的问题，并且你需要比较类型，你可以这样做：
package main
import (
"fmt"
"reflect"
)
func myfunction(v interface{}, mytype interface{}) bool {
return reflect.TypeOf(v) == reflect.TypeOf(mytype)
}
func main() {
assertNoMatch := myfunction("hello world", map[string]string{})
fmt.Printf("%+v\n", assertNoMatch)
assertMatch := myfunction("hello world", "stringSample")
fmt.Printf("%+v\n", assertMatch)
}
这种方法是使用你想要匹配的类型的示例。
英文:
@hlin117,
Hey, if I understood your question correctly and you need to compare the types, here's what you can do:
package main
import (
"fmt"
"reflect"
)
func myfunction(v interface{}, mytype interface{}) bool {
return reflect.TypeOf(v) == reflect.TypeOf(mytype)
}
func main() {
assertNoMatch := myfunction("hello world", map[string]string{})
fmt.Printf("%+v\n", assertNoMatch)
assertMatch := myfunction("hello world", "stringSample")
fmt.Printf("%+v\n", assertMatch)
}
The approach is to use a sample of the type you'd like to match.
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