Re: Unable to match function definition to an existing declaration

From: Victor Bazarov (v.Abazarov_at_comAcast.net)
Date: 11/17/04

  • Next message: Doug Harrison [MVP]: "Re: Unable to match function definition to an existing declaration" 
    Date: Wed, 17 Nov 2004 15:07:40 -0500

    Murrgon wrote:
    > Consider the following for VC7.1
    >
    > //
    > ===========================================================================
    > #include <vector>
    > using namespace std;
    >
    > template <class TYPE>
    > class TArray : public vector<TYPE>
    > {
    > public:

    Add here:

          typedef typename vector<TYPE>::size_type size_type;

    > inline size_type GetAllocSize() const;
    > };
    >
    > template<class TYPE>
    > inline typename vector<TYPE>::size_type TArray<TYPE>::GetAllocSize() const

    Change to

    inline
       typename TArray<TYPE>::size_type
                  TArray<TYPE>::GetAllocSize() const

    > {
    > return(vector<TYPE>::capacity());
    > }
    >
    >
    > //
    > ===========================================================================
    > // Main
    > ======================================================================
    > //
    > ===========================================================================
    > int main()
    > {
    > TArray<int> aIntegers;
    > return 0;
    > }
    >
    > //
    > ===========================================================================
    >
    > This gives me a C2244 error: "unable to match function definition to an
    > existing declaration". The help on error C2244 says "An unusual use of
    > the unary + operator was used in front of a function call that did not have
    > parenthesis."
    >
    > What?
    >
    > I don't see any + operator in use here. Can someone tell me what is
    > actually
    > wrong here?

    It can't find 'size_type' when processing the declaration. There must be
    some weirdness in the way dependent types are resolved in VC++, but I am
    too lazy now to track them down. This:
    ---------------------------------------------
    #include <vector>
    using namespace std;

    template <class TYPE>
    class TArray : public vector<TYPE>
    {
    public:
       typename vector<TYPE>::size_type GetAllocSize() const;
    };

    template<class TYPE>
    inline typename vector<TYPE>::size_type TArray<TYPE>::GetAllocSize() const
    {
       return vector<TYPE>::capacity();
    }

    int main()
    {
       TArray<int> aIntegers;
    }
    ---------------------------------------------
    doesn't compile (although it should). It can't find that "vector<TYPE>"
    is the actual base class of 'TArray<TYPE>'.

    I checked with VC++ v8, and it can't compile it either. I am not going
    to submit a bug report for that, too lazy. Besides, it probably has
    already been reported.

    V

  • Next message: Doug Harrison [MVP]: "Re: Unable to match function definition to an existing declaration"

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