overloading operator loop std::vector [duplicate]

This question already has an answer here:

• How to make my custom type to work with “range-based for loops”? 7 answers

How would i overload the operator that is used in a for loop

i would like to be able to get my std::vector from myclass

but also be able to use ::Get() to still return the class

template<typename T>
class Singleton
{
protected:
    Singleton() {}
    ~Singleton() {}

    Singleton(const Singleton&) = delete;
    Singleton& operator=(const Singleton&) = delete;

    Singleton(Singleton&&) = delete;
    Singleton& operator=(Singleton&&) = delete;

public:
    static inline T& Get()
    {
        static T inst{};
        return inst;
    }
};

class Random : public Singleton<Random>
{
public:
    std::vector<int> ALL() { return _vec; }

private:
    std::vector<int> _vec;
};

for (auto c : Random::Get()) //<----- how would i make this work to get the std::vector
{

}