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Template class attribute of a template class [message #1822500]

Sun, 08 March 2020 19:01

Dila Eclipse

Messages: 4
Registered: March 2020

Junior Member

What I would like to achieve is this (in C++)

template <typename T> class Inner {
};

template <typename T> class Outer {
  Inner<T> myAttribute;
};

That is, I want to instantiate a template class within another template class and pass through the template parameter.

What I have tried is this

index.php/fa/37538/0/

But when I generate the C++ code, there is a problem

template<class S>
class linked_list {
public:
	/************************************************************/
	typedef shared_ptr<S> linked_list_element_ptr;

	/**
	 * 
	 */
	::CppProject::linked_list::linked_list::linked_list_element_ptr head_;

};

The problem is that, although the inner class is correctly bound to the template parameter of the outer class, the attribute definition refers to the absolute global namespace signature of the inner class and neglects to specify the required template parameter.

So it does not compile.

Is this a bug or is my approach wrong?

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[Updated on: Mon, 09 March 2020 20:32]

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Re: Template class attribute of a template class [message #1822622 is a reply to message #1822500]

Tue, 10 March 2020 14:35

Carsten Pitz

Messages: 479
Registered: May 2015
Location: Germany

Senior Member

I have no C++ Designer installed, but what is about the attached model.
/Carsten

Attachment: OuterInnerTemplateClass.zip
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Re: Template class attribute of a template class [message #1822649 is a reply to message #1822622]

Tue, 10 March 2020 18:58

Dila Eclipse

Messages: 4
Registered: March 2020

Junior Member

Thanks, but unfortunately this is not the same as what I am trying to achieve.

The model you have posted produces the following C++ code

class T {
};

class Outer: public T {
public:
	class Inner: public T {
	};
};

Which has nested the declaration of the class rather than an attribute definition. Also, the Template/Generics aspect is missing.

I really appreciate your help though, thanks!

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