problem with templates

This is a discussion on problem with templates within the C++ Programming forums, part of the General Programming Boards category; hello, i am hoping that someone knowledgable about C++ templates could help solve a problem i am having. Before i ...

  1. #1
    Registered User
    Join Date
    Apr 2006
    Posts
    2

    problem with templates

    hello, i am hoping that someone knowledgable about C++ templates could help solve a problem i am having. Before i explain the problem, i want to show a simplified version of the code I've got for the class that I'm having trouble with:

    Code:
    template <typename TYPE>
    class linked_list
    {
    private:
    	template <typename TYPE>
    	class node
    	{
    		TYPE * data;
    	};
    
    public:
    	node<TYPE> & operator[](unsigned int index);
    };
    The problem is that when I try to make a declaration for the operator[]() method, I get many errors. I want it to return a reference to a linkedlist::node class. I attempted to declare it like this:

    Code:
    template <typename TYPE>
    linked_list<TYPE>::node<TYPE> & linked_list<TYPE>::operator[](unsigned int index)
    {
    }
    I would think that something like this would work. Microsoft Visual C++ 8.0 says that the node type that's in the linked_list class is equivilent to

    Code:
    class linked_list<TYPE>::node<typename TYPE>
    I would be appreciative if someone would be able to tell me the proper way to make my declaration for operator[](). Thank you.

  2. #2
    C++ Witch laserlight's Avatar
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    You might have to use typename, e.g.
    Code:
    template <typename TYPE>
    typename linked_list<TYPE>::node<TYPE> & linked_list<TYPE>::operator[](unsigned int index)
    {
    }
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  3. #3
    Registered User
    Join Date
    Apr 2006
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    2
    Thank you, that did the trick.

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