How to override a MFC macro template

[Alexh]

Hi,

I have created my own SerializeElements() function but when I run the
code it still uses MFC's version.

I have the following line in my .h file -

class MyClass : Cobject
{
....
};

void AFXAPI SerializeElements(CArchive& ar,CChartInfo* pChartInfo, int
nCount);


and the following in my .cpp file (at the end)-

void AFXAPI SerializeElements(CArchive& ar, CChartInfo* pChartInfo,
int nCount)
{
for(int i=0;nCount;i++,pChartInfo++)
{
pChartInfo->Serialize(ar);
}
}

But the code MyCList.Serialize(ar) still ends up calling the
SerializeElements in afxtempl.h.

Whats the rule for overriding functions of this type? I do not have
#include <afxtempl.h> in my files but I know it's being compiled by
other code in my project.

Thanks

[Igor Tandetnik]

Post by Alexh
I have created my own SerializeElements() function but when I run the
code it still uses MFC's version.
I have the following line in my .h file -
class MyClass : Cobject
{
....
};
void AFXAPI SerializeElements(CArchive& ar,CChartInfo* pChartInfo, int
nCount);

I believe you need to specialize SerializeElements template for your
type, rather than overloading it with a non-template function. Like
this:

template<>
void AFXAPI SerializeElements<CCharInfo>(CArchive& ar,CChartInfo*
pChartInfo, int
nCount);

The code in CList::Serialize calls SerializeElements with explicit
template parameter list, like this:

SerializeElements<TYPE>(ar, pData, 1);

This call will never pick a non-template overload.

[Ben Voigt [C++ MVP]]

Post by Igor Tandetnik

Post by Alexh
I have created my own SerializeElements() function but when I run the
code it still uses MFC's version.
I have the following line in my .h file -
class MyClass : Cobject
{
....
};
void AFXAPI SerializeElements(CArchive& ar,CChartInfo* pChartInfo,
int nCount);

I believe you need to specialize SerializeElements template for your
type, rather than overloading it with a non-template function. Like
template<>
void AFXAPI SerializeElements<CCharInfo>(CArchive& ar,CChartInfo*
pChartInfo, int
nCount);
The code in CList::Serialize calls SerializeElements with explicit
SerializeElements<TYPE>(ar, pData, 1);
This call will never pick a non-template overload.

Also be careful that the specialization is in scope every time
CList<CChartInfo> is used. The compiler won't generate calls to functions
it doesn't know about.