Golang反射性能基准测试分析

type User struct {
    Name string
    Age  int
}

func (u *User) Greet() string {
    return "Hello, " + u.Name
}

func BenchmarkSetFieldDirect(b *testing.B) {
    var u User
    for i := 0; i < b.N; i++ {
        u.Name = "Alice"
        u.Age = 25
    }
}

func BenchmarkSetFieldReflect(b *testing.B) {
    var u User
    v := reflect.ValueOf(&u).Elem()
    nameField := v.FieldByName("Name")
    ageField := v.FieldByName("Age")
    for i := 0; i < b.N; i++ {
        nameField.SetString("Alice")
        ageField.SetInt(25)
    }
}

func BenchmarkCallMethodDirect(b *testing.B) {
    u := &User{Name: "Bob"}
    for i := 0; i < b.N; i++ {
        u.Greet()
    }
}

func BenchmarkCallMethodReflect(b *testing.B) {
    u := &User{Name: "Bob"}
    v := reflect.ValueOf(u)
    method := v.MethodByName("Greet")
    args := []reflect.Value{}
    for i := 0; i < b.N; i++ {
        method.Call(args)
    }
}