Quick question about class template

This is a discussion on Quick question about class template within the C++ Programming forums, part of the General Programming Boards category; Hi@all I wrote my own list class now I am supposed to convert it to a template class so I ...

  1. #1
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    Quick question about class template

    Hi@all

    I wrote my own list class now I am supposed to convert it to a template class so I can use it for another program.

    In my list I also have an iterator class which I implemented.

    At the begining of .h file, I put
    Code:
     template <typename Item>
    and I changed functions that I wrote for list class like for copy constructor
    Code:
    list (const list<Item>& orginal)
    my question is do I need to change anything for iterator class? I have an example template class which doesn't have an iterator class in it so I am confused

    thanks

  2. #2
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    template <typename Item>
    I think it's pretty standard to use "T" for the type parameter, i.e.:

    template <typename T>

    "Item" isn't too descriptive, and in fact it's probably misleading. "T" stands for type, and you are saying that wherever the "T" appears in your code, it will be a variable.

    I wrote my own list class now I am supposed to convert it to a template class
    What type did you write it for? It's pretty simple to convert, you just replace that type with "T" wherever you want the type to be a variable.
    ---

    Suppose you declare a list like this:

    list<int> myList;

    If you want to declare an iterator for that list, you do this:

    list<int>::iterator pos = myList.begin();

    As you can see, the type of the things stored in the list is reflected in the iterator type as well: 'pos' is of type list<int>::iterator
    Last edited by 7stud; 12-06-2005 at 09:38 PM.

  3. #3
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    Thanks 7stud

    I understood everything but how about if I have a friend iterator class in my template class, I mean when I convert my class to a template class, do I have to change my iterator friend function?

    for example; if I have my own stack class and It has a friend iterator class and I want to convert it to a template class, do I need to change iterator class too?

    Code:
    template <typename T>
    class Stack{
    friend class iterator;
    private:
    .....
    ......
    public:
    //************************begin class iterator**************************
    class iterator {
    friend class Stack;
    private:
    .....
    .....
    public:
    .....
    .....
    };
    //************************end class iterator**************************
    private:
    .....
    .....
    public:
    ....
    .....
    };

  4. #4
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    1)What type in your class do you want to vary?

    2)Post how you would declare an iterator for your list class

  5. #5
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    Quote Originally Posted by 7stud
    1)What type in your class do you want to vary?

    2)Post how you would declare an iterator for your list class
    Thanks for your help but I can not post my code because of some reasons.

    If I knew how to convert my class to a template class, I would complete my program.

  6. #6
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    I didn't ask you to post your code. I asked you two simple questions. If you can't answer them, then you can't write templates.

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