[Openexr-user] Hi everybody

[Dharmendra Bhojwani]

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>'"

Can any body please help to findout the problem ?

Thanks


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[Kevin Wheatley]

Post by Dharmendra Bhojwani
I have a function declaration like this in a template class.
template <class T> class CElement
{
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