Question

Question as I have not done much with vectors and templates.

If I have a class foo that is templated class and I want to create a vector of foo pointers regardless of foo type, what would the syntax look like?

Answer 1

Not possible. When you use a class template anywhere, you need it instantiated on a type.
One possibility to circumvent that, is to provide a polymorphic interface base class for foo and have a vector of those pointers.

class IFoo{
  virtual void bar() = 0;
  virtual int baz() = 0;
};

template<class T>
class Foo : IFoo{
   // concrete implementations for bar and baz
};

// somewhere in your code:
std::vector<IFoo*> vecFoo.
vecFoo.push_back(new Foo<int>);

The obvious problem with that is, that you can’t need to know each possible return value for your bar and baz functions.