class template Prototype?

This is a discussion on class template Prototype? within the C++ Programming forums, part of the General Programming Boards category; Hi, I am having a problem declaring a class template prototype, i.e: template <class type> class foobar<type>; // the prototype ...

  1. #1
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    Dec 2002
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    Question class template Prototype?

    Hi,

    I am having a problem declaring a class template prototype, i.e:

    template <class type>
    class foobar<type>; // the prototype

    // some code...

    template <class type>
    class foobar { // the definition
    // some other code...
    };

    My VC++ compiler returns (at the “class foobar<type>;” line):
    error C2143: syntax error : missing ';' before '<'

    And when I just set the prototype to “class foobar;” it returns:
    error C2989: foobar: template class has already been defined as a non-template class

    For clarity I should point out that the class prototype, definition and functions are all in
    the same file and compile fine if I don’t add the prototype and the code that requires it.
    So the question is how does one declare a class template prototype?

    Any help is greatly appreciated.
    We haven't inherited Earth from our parents; instead we have borrowed her from our children - old Indian saying.

  2. #2
    Registered User Codeplug's Avatar
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    4,676
    You were close...
    Code:
    template<class type> class foobar;
    template<class type> class foobar { };
    
    int main()
    {
        foobar<int> fb;
    
        return 0;
    }//main
    gg

  3. #3
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    Smile

    thanks alot mate!!
    We haven't inherited Earth from our parents; instead we have borrowed her from our children - old Indian saying.

  4. #4
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    here's a templated class implementing a crude templated array. The class needs to be flushed out to make it useful for anything other than demonstrating the syntax of templated class method definitions, so use it as you may:
    Code:
    template<class T> 
    class Array
    {
      public:
    	T * pT;
    	 int size;
    	 Array();
    	 Array(const Array & rhs);
    	 ~Arrray () {delete [] pT;}
    	 //etc.
    };
     
    template<class T> Array<T>::Array : size(10)
    {
      pT = new T[size];
    }
     
    template<class T> Array<T>::Array(const Array & rhs)
    {
      for(int i = 0; i < size; ++i)
    	 pT[i] = rhs.pT[i];
    }
     
    int main()
    {
       Array<int> fb;
    }
    Last edited by elad; 12-03-2004 at 02:39 PM.

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