C ++ Error C2228 (to the left of '.val' must have class / struct / union) in unusual circumstances

Question

In C ++, I am trying to implement my own class anyusing C ++. However, before I could test it (so if my implementation is bad, feel free to fix me), I got an error: error C2228: left of '.val' must have class/struct/uniontwice from using the function value()twice, which seems strange when it works everywhere, The only thing I could think of this is what decltypeinfront of the function is causing an error, but it shouldn't:

Edit: I updated the way the variable is changed for the constructor template<class T> any(T V){...}

class any{
protected:
    template<class T> struct variable{
    public:
        T val;
        variable(){}
        variable(T t) : val(t){}
    };
    variable<int> v;
public:
    any(){
        v.val = 0;
    }
    template<class T> any(T V){
        variable<T> nV(V);
        v = nV;
    }
    ~any(){
        delete &v;
    }
    decltype(v.val) value(){ // Error still here
        return v.val;
    }
    template<class T> static any create(T V){
        return any(V);
    }
};

Answer 1

, , :

T = NewT;

++ T , . "" , . (Python,...) ++ . ( T s), ( , ), .

, . , , , , (: ). , , ++, . , , Boost.Any, , . (: , )