Sorting within a template

Giuliano Bertoletti <>
Sat, 15 Dec 2012 11:05:45 +0100

I defined a template class that acts as a container for some type objects.

Since theose objects are heavy, I need to reference them using pointers.

Assume that each object has a compare function working with pointers.
I came up with this:

template <typename OBJ, typename OBJ_CONTAINER = std::vector<OBJ *>>
class CObjCont
     OBJ_CONTAINER table;

     bool operator()(OBJ *p1, OBJ *p2)
         return (p1->CompareTo(p2) < 0);

     void sort()
                   CObjCont<OBJ, CONTAINER>); // error here

now the problem is that I would like to invoke the operator() within the
sort function, but passing the class name won't work.

error C2275: 'CObjCont<OBJ>' : illegal use of this type as an expression

Why is it different from the example below I found on the net?

struct myclass {
   bool operator() (int i,int j) { return (i<j);}
} myobject;

int main () {
   int myints[] = {32,71,12,45,26,80,53,33};

   // using object as comp
   std::sort (myvector.begin(), myvector.end(), myobject);


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