C / C++ / MFC

I have 3 functions that do sorting on a CArray.

CArrays are declared in header file:

CArray<int*, int*>m_Integer;
CArray<string*, string*>m_String;
CArray<double*, double*>m_Double;

void sortIntegers()
{

// Do sorting for m_Integer here
}

void sortStrings()
{
// DO sorting for m_String
}

void sortDouble()
{
// Do sorting for m_Double
}

Now what i want to do is, have one generic function and then pass the CArray to that.

So far what i did is,

in Header file:

void sortAll(CArray<void*, void*> m_Array);

in CPP file:

void sortAll(CArray<void*, void*> m_Array)
{
    int size = m_Array.GetSize();

    ............
    ............
    ............

    m_Array.GetAt(0); // Error here
    ................
    ................
}

The error is that, it needs a class type and not a void type.

I am not sure how to proceed with writing a generic function to handle all different data types in one.

Any help is welcome!

in Header in Class Declaration:
    #include <functional>
...
	bool ProvideItemData(int nItem, int nSubItem);

in .cpp:

	{
		//using namespace std::placeholders; // for `_1`
		m_ListCtrl.SetOwnerData(std::bind(&CBlockEditView::ProvideItemData, this, std::placeholders::_1));
	}

declaration in called class:

bool SetOwnerData(std::function <bool(int nItem,int nSubItem)> callback);

c:\program files (x86)\microsoft visual studio 14.0\vc\include\type_traits(1501): error C2440: 'return': cannot convert from 'std::_Unforced' to 'bool'
1>  c:\program files (x86)\microsoft visual studio 14.0\vc\include\type_traits(1501): note: No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
1>  c:\program files (x86)\microsoft visual studio 14.0\vc\include\functional(210): note: see reference to function template instantiation '_Rx std::_Invoke_ret<_Rx,_Callable&,_Ty,_Ty>(std::_Forced<_Rx,false>,_Callable &,_Ty &&,_Ty &&)' being compiled
1>          with
1>          [
1>              _Rx=bool,
1>              _Callable=_Decayed,
1>              _Ty=int
1>          ]
1>  c:\program files (x86)\microsoft visual studio 14.0\vc\include\functional(208): note: while compiling class template member function 'bool std::_Func_impl<_Decayed,_Alloc,_Ret,int,int>::_Do_call(int &&,int &&)'
1>          with
1>          [
1>              _Alloc=std::allocator<int>,
1>              _Ret=bool
1>          ]
1>  c:\program files (x86)\microsoft visual studio 14.0\vc\include\functional(136): note: see reference to class template instantiation 'std::_Func_impl<_Decayed,_Alloc,_Ret,int,int>' being compiled
1>          with
1>          [
1>              _Alloc=std::allocator<int>,
1>              _Ret=bool
1>          ]
1>  c:\program files (x86)\microsoft visual studio 14.0\vc\include\functional(339): note: see reference to class template instantiation 'std::_Is_large<_Myimpl>' being compiled
1>  c:\program files (x86)\microsoft visual studio 14.0\vc\include\functional(318): note: see reference to function template instantiation 'void std::_Func_class<_Ret,int,int>::_Reset_alloc<_Ty,std::allocator<int>>(_Fx &&,const _Alloc &)' being compiled
1>          with

CFileDialog fileDlg(TRUE, _T("*"), NULL, OFN_PATHMUSTEXIST | OFN_OVERWRITEPROMPT, _T("All files (*.*)|*.*||"), NULL);
if(IDOK == fileDlg.DoModal())
    TRACE(">>>%s\n", fileDlg.GetFileName());

>>>D