使用c ++ / QT创建者从另一个类中以及从另一个类中设置和获取Singleton变量

Question

im new in c++

my problem: this is my singleton:

class Singleton
{
    static Singleton *singletonInstance;
    Singleton() {}

    public:
    int numero = 0;

    static Singleton* getSingletonInstance()
    {
        //std::lock_guard<std::mutex> lock(m_);
        if(singletonInstance == nullptr)
        {
            singletonInstance = new Singleton();
        }
        return singletonInstance;
    }
};

this is another file .cpp where i set or get the "numero" variable:

Singleton.getSingletonInstance()->numero = 10;

I get this error:

error: expected unqualified-id before '.' token

Singleton.getSingletonInstance()->numero = 10;

How do to set "numero" variable and get/set the numero from sigleton in/from other class .cpp ? My target is use this singleton. I'm new in c++. Where I wrong ? Thanks

Answer 1

The symbol Singleton is not an object, it's a class. For that you have to use the scoping operator :: :

Singleton::getSingletonInstance()->numero = 10;