Accessing variables from base template class in derived class constructor in C++

Question

Let\'s look at this simple code sample including a base class and a class derived from Base, which needs the address of a base class member in its constructor.

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Answer 1

In the second case, the Base is a template and someone might add specializations for the template, all with different member variables. The compiler cannot know until it sees what T is.

There might also be a global arr that could fit. You can help the compiler by using this->arr[0] to indicate that it always is a member variable.