Use of undeclared identifier in C++ with templates and inheritance [duplicate]

Answer 1

use this pointer to invoke the addStuff method i.e

this->addStuff(thingy);

Answer 2

There are several issues:

1. Missing semicolons after class definitions.
2. Missing type for doSomething method declaration/definition.
3. Missing type for definition of addStuff method.

After fixing that it seems to work.

Edit: As you have fixed the syntax errors and it still does not work. As others have suggested your compiler may require you to call the addStuff method with this-> prefix:

this->addStuff(thingy);

Answer 3

try

this->addStuff(thingy);

Answer 4

It's due to template inheritance. In such case you should mannualy specify using for base methods:

template <typename T>
MyDerived<T>::doSomething() {
  using MyBase<T>::addStuff;
  T* thingy = new T();
  addStuff(thingy); 
}

or do it by this pointer:

template <typename T>
MyDerived<T>::doSomething() {
  T* thingy = new T();
  this->addStuff(thingy); 
}