Question

First I have a class called Foo and it contains a virtual function int Foo::getId()

I have a typedef: typedef std::vector<Foo*> FooList;

Then I define Foo::FooList *list; and I load up this vector.

I was wondering how I would access getId(). Currently I am using list[a].getId(); but the compiler keep saying error: class std::vector<Foo*, std::allocator<Foo*> > has no member named getId.

Thanks for your help!

Answer 1

list->at(a)->getId();

You could also do

list->operator[](a)->getId();

or

(*(*list)[a]).getId();

or any combination.

The list is a pointer, so needs to be dereferenced, as do the pointers it contains. The array operator on a pointer that is not dereferenced will add a to list – making it point to a different location.