Golang：从字符串指向函数的指针（函数名称）

Question

Is there any chance to get pointer to function from function's name, presented as string? This is needed for example to send some function as argument to another function. Some sort of metaprogramming, you know.

Answer 1

Go functions are first class values. You don't need to revert to the tricks from dynamic languages.

package main

import "fmt"

func someFunction1(a, b int) int {
        return a + b
}

func someFunction2(a, b int) int {
        return a - b
}

func someOtherFunction(a, b int, f func(int, int) int) int {
        return f(a, b)
}

func main() {
        fmt.Println(someOtherFunction(111, 12, someFunction1))
        fmt.Println(someOtherFunction(111, 12, someFunction2))
}

Playground

---

Output:

123
99

If the selection of the function depends on some run-time-only known value, you can use a map:

m := map[string]func(int, int) int {
        "someFunction1": someFunction1,
        "someFunction2": someFunction2,
}

...

z := someOtherFunction(x, y, m[key])