Go语言中获取函数实体的四种方法小结

package main

import (
    "fmt"
    "reflect"
)

func foo() {
    fmt.Println("Hello, world!")
}

func main() {
    funcValue := reflect.ValueOf(foo)
    funcPtr := funcValue.Pointer()
    fmt.Printf("Function Address: 0x%x\n", funcPtr) // 输出类似0x45f5e0
}

package main

import (
    "fmt"
    "runtime"
)

func getCallerName() string {
    pc, _, _, _ := runtime.Caller(1) // 参数1表示跳过当前栈帧
    return runtime.FuncForPC(pc).Name()
}

func test() {
    fmt.Println("当前函数:", getCallerName()) // 输出main.test
}

func main() {
    test()
}

package main

import "fmt"

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

func main() {
    var operation func(int, int) int
    operation = add
    fmt.Println(operation(2, 3)) // 输出5

    // 匿名函数赋值
    square := func(x int) int {
        return x * x
    }
    fmt.Println(square(4)) // 输出16
}

// 需实现AST解析，此处为示意代码
import (
    "go/parser"
    "go/token"
)

func listPackageFuncs(pkgPath string) {
    fset := token.NewFileSet()
    pkgs, _ := parser.ParseDir(fset, pkgPath, nil, 0)
    for _, pkg := range pkgs {
        for _, file := range pkg.Files {
            for _, decl := range file.Decls {
                if fn, ok := decl.(*ast.FuncDecl); ok {
                    fmt.Println(fn.Name.Name)
                }
            }
        }
    }
}