Re: [SPAM] [Openexr-user] Hi everybody

[Kevin Wheatley]

Dharmendra Bhojwani wrote:
> I have a function declaration like this in a template class.
>  
> template <class T> class CElement
> {
> public:
> template <class Y> bool _internal_less (CElement<Y> const& rhs) const;
> };
>  
> And following is the function defination...
>  
> template <class T, class Y> inline
>   bool CElement <T>::_internal_less (CElement<Y> const& rhs) const
>  {
>  return iCount < rhs.iCount;
>  }
>  
> when i compile it using , g++ , it gives error ....
>  
> "prototype for `bool CElement<T>::_internal_less(const CElement<Y>&) 
> const' does not match any in class `CElement<T>'"

couple of suggestions...

you can't define an inline function out of line ... also you need two 
separate template<> parameter definitions in your out of line 
definition, one for the class template and one for the template member 
function. With such a simple function I'd use an inline definition 
especially if you have profiling data to backup your need for inlining 
the function:

template <class T> class CElement
{
public:
    template <class Y>
    bool _internal_less (CElement<Y> const& rhs) const
    {
        return iCount < rhs.iCount;
    }
};

If you want an out of line definition then something like this should 
work:

template <class T>
template <class Y>
bool CElement <T>::_internal_less (CElement<Y> const& rhs) const
{
  return iCount < rhs.iCount;
}

Kevin

--
| Kevin Wheatley, Cinesite (Europe) Ltd | Nobody thinks this      |
| Senior Technology                     | My employer for certain |
| And Network Systems Architect         | Not even myself         |