How to add Template class as member within a normal class

I have a template class: templClass which takes in a type and works like a regular template class. I want that class to be a member of another regular class regClass. regClass has a member variable var, based on which I wish to create templClass of type1 or type2: So it is as follows

template <class T>
class templClass
{
  //constructor  
};

class regClass
{
public:
    regClass()
    {
        // constructor for other members
    }
    int var;
    templClass templClass_;
    // if (var == 0)
    // {I want templClass<type1>}
    // else
    // {I want templClass<type2>}
};

How can I achieve this? The implementation above throws a compiler error error: invalid use of template-name 'templClass' without an argument list