What is the essence of golang function overloading?

There is no function overloading in the Go language, but it can be simulated through two technologies: 1. Method collection: Define an interface that contains methods with the same name but different parameter lists. Different types of structures can implement the interface, thereby creating overloading. Loading methods; 2. Reflection: Use reflection to dynamically call different methods with the same name, and call methods with specific method names through reflection objects.

The essence of Go function overloading

There is no function overloading in the traditional sense in the Go language, but it can be achieved through specific technologies Simulate the behavior of function overloading.

Method Sets: Method Sets

Function overloading in Go can be implemented through method sets. When an interface defines a set of methods with the same name but different parameter lists, a set of overloaded methods can be created.

type Shape interface {
    Area() float64
}

type Square struct {
    side float64
}

func (s Square) Area() float64 {
    return s.side * s.side
}

type Circle struct {
    radius float64
}

func (c Circle) Area() float64 {
    return math.Pi * c.radius * c.radius
}

Reflection: Reflection

Different methods with the same name can be called dynamically through reflection.

package main

import (
    "fmt"
    "reflect"
)

type Shape interface {
    Area() float64
}

type Square struct {
    side float64
}

func (s Square) Area() float64 {
    return s.side * s.side
}

type Circle struct {
    radius float64
}

func (c Circle) Area() float64 {
    return math.Pi * c.radius * c.radius
}

func main() {
    shapes := []Shape{
        Square{side: 5.0},
        Circle{radius: 3.0},
    }

    for _, shape := range shapes {
        areaValue := reflect.ValueOf(shape).MethodByName("Area").Call([]reflect.Value{})[0]
        fmt.Println("Area:", areaValue.Float())
    }
}

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