package main

import "fmt"

// Animal 接口定义
type Animal interface {
	Speak() string
}

// Dog 实现Animal接口
type Dog struct{}

func (d Dog) Speak() string {
	return "汪汪汪"
}

// Cat 实现Animal接口
type Cat struct{}

func (c Cat) Speak() string {
	return "喵喵喵"
}

// interfaceEscape 变量赋值给接口，触发逃逸
func interfaceEscape(animalType string) Animal {
	var a Animal
	if animalType == "dog" {
		d := Dog{} // d 逃逸至堆
		a = d
	} else {
		c := Cat{} // c 逃逸至堆
		a = c
	}
	return a
}

// interfacePointer 指针赋值给接口，触发逃逸
func interfacePointer() interface{} {
	p := &Dog{} // p 逃逸至堆
	return p
}

func main() {
	animal := interfaceEscape("dog")
	fmt.Printf("接口动态派发：%s\n", animal.Speak())

	iface := interfacePointer()
	if dog, ok := iface.(*Dog); ok {
		fmt.Printf("接口指针逃逸：%s\n", dog.Speak())
	}
}