小编spi*_*kle的帖子

我有以下代码：

#include <iostream>

class AnimalRepository {
public:
    virtual ~AnimalRepository() = default;

    virtual auto makeSound() -> void {
        std::cout << "Null" << std::endl;
    }

};

class CatRepository: public AnimalRepository {
public:
   
    auto makeSound() -> void override {
       std::cout << "Meow" << std::endl;
    }

};

class DogRepository: public AnimalRepository {
public:

    auto makeSound() -> void override {
        std::cout << "Woof" << std::endl;
    }

};

class Animal {
public:
    explicit Animal(const AnimalRepository& repository)
            : repository(repository) {
    }

    auto makeSound() -> void {
        return …