templates: parent class member variables not visible in inherited class

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This is because the template parent of a template class is not instantiated during the compilation pass that first examines the template. These names appear to be non-dependent on the particular template instantiation, and therefore the definitions need to be available. (If you never look at the definition of arrayListType, then reading the code of unorderedArrayListType it would appear the list and length need to be some sort of globals.)

You’ll need to tell the compiler explicitly that the names are in fact dependent on the instantiation of the parent.

One way, using this-> before all the inherited names: this->list, this->length.

Another way, using declarations: using arrayListType<elemType>::length; etc (for example in the private section of the derived class).

A FAQ entry on this: https://isocpp.org/wiki/faq/templates#nondependent-name-lookup-members

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