Overriding a template argument in grandchild class in C++?

Question

I have the following hierarchy

template<class SettingsType>
    class TemplatedBase;

class A : public TemplatedBase<SettingsTypeA>;

class B : public A;

class SettingsTypeA;

class SettingsTypeB : public SettingsTypeA;

Is there a way to override the template specialization in B so it inherits from A while having the template specialization SettingsType set to SettingsTypeB

Answer 1

No. Template is not a class. It's a template .

TemplatedBase<SettingsTypeA> is a specific instantiation of the template - it's just the regular Foo class. There is nothing special about it beyond that.

So your question is the equivalent of asking if you can change C for D in below example:

class A : public C;

class B : public A;

Answer 2

A simple change would be to template A while giving it a default:

template<typename T = SettingsTypeA>
class A : public TemplatedBase<T> {};

and then you can use the needed type when B inherits from A :

class B : public A<SettingsTypeB> {};