doudi4137 2016-03-02 17:09
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在golang中调用作为接口变量接收的函数

I have a code which is similar to the following

package main

import "fmt"

func PrintThis(arg string) {
    fmt.Printf("I'm printing %s", arg)
}

func PrintThisAndThat(arg1, arg2 string) {
    fmt.Printf("Now printing %s and %s", arg1, arg2)
}

func Invoke(fn interface{}, args ...string) {
    //fn(args...)
}

func main() {
    Invoke(PrintThis, "foo")
    Invoke(PrintThisAndThat, "foo", "bar")
}

This is not the actual production code, but this is a simplified version.

Question :- If I uncomment the line //fn(args...) I get a compile error prog.go:14: cannot call non-function fn (type interface {})

How do I execute the function which is received as the argument tho the Invoke() function?

What is the right way to achieve this?

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  • dsfdfdfd6576578 2016-03-02 18:13
    关注

    You use the Call or CallSlice methods of the reflect.Value to call it as a function. As with all reflect.Value methods, this panics is fn is the wrong type.

    func Invoke(fn interface{}, args ...string) {
        v := reflect.ValueOf(fn)
        rargs := make([]reflect.Value, len(args))
        for i, a := range args {
            rargs[i] = reflect.ValueOf(a)
        }
        v.Call(rargs)
    }
    

    http://play.golang.org/p/xGmNLDcLL_

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