Templates with Function Type Parameter Cause Compiler Error

I have defined the following function in C++:

template<class Type> Type GetMedian(const vector<Type>& items, function<bool(Type, Type)> comp) {
  vector<Type> copied_items(items);
  std::nth_element(copied_items.begin(), copied_items.begin() + copied_items.size()/2, copied_items.end(), comp);
  return copied_items[copied_items.size()/2];
}

However, when I try to call it as GetMedian(v, greater<uint32_t>()), my compiler (clang) complains:

error: no
      matching function for call to 'GetMedian'
  GetMedian(v, greater<uint32_t>());
  ^~~~~~~~~
note: 
      candidate template ignored: could not match 'function' against 'greater'
template<class Type> Type  GetMedian(const vector<Type>& items, function...

However, I do not see this error, whenever I change to not use templates, as:

uint32_t GetMedian(const vector<uint32_t>& items, function<bool(uint32_t, uint32_t)> comp) {
  vector<uint32_t> copied_items(items);
  std::nth_element(copied_items.begin(), copied_items.begin() + copied_items.size()/2, copied_items.end(), comp);
  return copied_items[copied_items.size()/2];
}

Is there any way to make my function as flexible as I am trying to?