template class containing a stdvector of references to its own instances

问题

I'm relatively new to C++, and am trying for the first time to build a complex template structure.

How can I declare, as member of a template class Foo, a std::vector of Foo* elements, but that could be of various types?

#include <vector>

template <typename T>
class Foo {
    T mValue;
    std::vector< Foo<T>* > mFooParameters;  // <---- I would like this vector to contain
                                            //       any sort of Foo<T>* elements,
                                            //       Foo<int>*, Foo<double>*, etc.
};

Is it straightforward, possible but complicated, or impossible?

Thank you for your answers!

回答1:

If your vector types are all related, use polymorphism as explained in the link provided by @jogojapan, if the types are not related at all, use a vector of void* to hold pointers to your data (kind of messy though)

来源：https://stackoverflow.com/questions/12967174/template-class-containing-a-stdvector-of-references-to-its-own-instances