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#include <iostream>
#include <string>
#include <map>

#define REGISTER_CLASS(classname) \
class classname##Class { \
public: \
    classname##Class(const std::string& name) { \
        ClassRegistry::getInstance().registerClass(name, this); \
    } \
}; \
classname##Class classname##Instance(#classname);

class ClassRegistry {
public:
    static ClassRegistry& getInstance() {
        static ClassRegistry instance;
        return instance;
    }

    void registerClass(const std::string& name, void* classInstance) {
        classes[name] = classInstance;
    }

    void* getClass(const std::string& name) {
        if (classes.find(name) != classes.end()) {
            return classes[name];
        }
        return nullptr;
    }

private:
    std::map<std::string, void*> classes;
};

// 瀹氫箟涓€涓被
class MyClass {
public:
    MyClass() {
        value = 0;
    }

    void setValue(int newValue) {
        value = newValue;
    }

    int getValue() const {
        return value;
    }

private:
    int value;
};

// 娉ㄥ唽绫荤殑鍏冩暟鎹?/span>
REGISTER_CLASS(MyClass)

int main() {
    // 鑾峰彇绫荤殑鍏冩暟鎹苟鍒涘缓瀹炰緥
    MyClass* myObj = static_cast<MyClass*>(ClassRegistry::getInstance().getClass("MyClass"));

    if (myObj) {
        myObj->setValue(42);
        std::cout << myObj->getValue() << std::endl;
    }

    return 0;
}

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