See the following code example:

#include <iostream>

template <typename tn>
class a{
protected:
	tn bar;
public:
	a(tn bar){
		this->bar=bar;
	}
	virtual tn getBar(){
		return bar;
	}
};

template <typename tn>
class b : public a<tn>{
private:
	void add(tn baz); 
public:
	b(tn bar, tn baz)
		: a<tn>(bar)
	{
		add(baz);
	}
};

template <typename tn>
void b<tn>::add(tn baz){
	bar+=baz;
}

int main(){
	b<unsigned> test(7,5);
	std::cout << test.getBar() << std::endl;
	return 0;
}

This gives
test.cpp: In member function `void b<tn>::add(tn)':
test.cpp:30: error: `bar' undeclared (first use this function)
test.cpp:30: error: (Each undeclared identifier is reported only once for each
function it appears in.)
As well as it's (in my and the opinion of ##c++) valid ANSI C++.