Template type problem


maybe someone can help me with this problem.
I've developed a template function using a class I, which is either a
CUIntArray or CStringArray.
My problem: How do I check on the contents?
Specifically, I need to know if the UInt is lesser 1 or if the String is
In every other respect, the template is suitable for both kinds of arrays.
It's only this one little problem...



template <class IO, class O, class I>
 CString SyncObjects(IO *pointerInt, IO *pointerExt, CStringArray* names, I*
nrInt, I* nrExt, O *pObject)
    if(nrExt->GetAt(i) <= 0)
    if(nrExt->GetAt(i) != "")

cash1 (13)
6/3/2004 12:05:03 PM
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Thomas Noone wrote:

> Hi,
>maybe someone can help me with this problem.
>I've developed a template function using a class I, which is either a
>CUIntArray or CStringArray.
>My problem: How do I check on the contents?
>Specifically, I need to know if the UInt is lesser 1 or if the String is
>In every other respect, the template is suitable for both kinds of arrays.
>It's only this one little problem...
>template <class IO, class O, class I>
> CString SyncObjects(IO *pointerInt, IO *pointerExt, CStringArray* names, I*
>nrInt, I* nrExt, O *pObject)
> {
>    if(nrExt->GetAt(i) <= 0)
>    if(nrExt->GetAt(i) != "")

One workaround is to name this test and embody it in a traits template type
parameter, e.g.

// Declare traits template
template<class I> struct I_Traits;

// Define some explicit specializations

struct I_Traits<CUIntArray>
   static bool Test(CUIntArray& nrExt, int i)
      return nrExt.GetAt(i) <= 0;

struct I_Traits<CStringArray>
   static bool Test(CStringArray& nrExt, int i)
      return !nrExt.GetAt(i).IsEmpty();

// Finally add the template parameter to your function; actually,
// you need to make this a class to take advantage of default
// template arguments, so...

template <class IO, class O, class I, class ITr = I_Traits<I> >
struct Whatever
   static CString SyncObjects(IO *pointerInt, IO *pointerExt,
         CStringArray* names, I* nrInt, I* nrExt, O *pObject)
      if (ITr::Test(*nrExt, i)) ...

Doug Harrison
Microsoft MVP - Visual C++
dsh (2498)
6/3/2004 7:42:41 PM

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