```
template<typename T>
class A
{
    public:

    A(T &t)
    : t_(t){}

    T t_;
};

int main()
{
    int value;
    A<decltype(value)> a(value);
    // what I wish for : A a(value); 
    // which does not compile "missing template argument before 'a'"
}

```

Is there a way in the declaration of A (or somewhere else) to hint the compiler that T should be automatically resolved to the type passed to the constructor ?

(ideally c++11, but happy to hear about less old versions)