Templates vs Virtual

This is a discussion on Templates vs Virtual within the C++ Programming forums, part of the General Programming Boards category; Overused topic I know, but this is not about performance. If I use templates then, in this example, I would ...

  1. #1
    Dae
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    Question Templates vs Virtual

    Overused topic I know, but this is not about performance.

    If I use templates then, in this example, I would be limited to only creating lists of HTTP clients -OR- FTP clients, but not both types in the same list due to being different types. As apposed to virtual, obviously.

    Sorry about the example and pseudo code.

    Code:
    class Protocol
    
    class HTTP : Protocol
    class FTP : Protocol
    
    
    templates:
    
    class Client<typename protocol>
    
    template <typename protocol>
    func CreateClient()
    
    client = CreateClient<HTTP>()
    client = CreateClient<FTP>()
    
    httpList = std::vector<Client<HTTP> >
    ftpList = std::vector<Client<FTP> >
    
    virtual:
    
    class Client
        Protocol* protocol
    
    func CreateClient(Protocol* protocol)
    
    client = CreateClient(new HTTP)
    client = CreateClient(new FTP)
    
    list = std::vector<Client>
    Oh, and my question is if this is correct, and/or there are better options. Thanks.
    Warning: Have doubt in anything I post.

    GCC 4.5, Boost 1.40, Code::Blocks 8.02, Ubuntu 9.10 010001000110000101100101

  2. #2
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    Or even better:

    Code:
    class Client
    {
    ...
    };
    
    class HTTPClient : public Client
    {
    ...
    };
    
    class FTPClient : public Client
    {
    ...
    };
    
    vector<Client*> list;
    list.push_back(new HTTPClient());
    list.push_back(new FTPClient());

  3. #3
    Dae
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    Well, I wanted protocol abstracted from the client. But if that's your suggestion, I assume you prefer a virtual base class. It comes down to the same thing.
    Warning: Have doubt in anything I post.

    GCC 4.5, Boost 1.40, Code::Blocks 8.02, Ubuntu 9.10 010001000110000101100101

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