C++ template with functor

functor.cpp

#include <vector>
#include <algorithm>
#include <iostream>

class Hage
{
  public:
    float val;
    Hage() {}
    Hage(float _val) { val = _val; }
};

template <class T>
class Cmp
{
  private:
    T hoge;

  public:
    bool operator()(const T& a, const T& b);
};

template<class T> bool Cmp<T>::operator()(const T& a, const T& b)
{
  if (a.val < b.val) {
    return true;
  } else {
    return false;
  }
}

int main()
{
  Cmp<Hage> cmp_obj;

  std::vector<Hage> nums;
  for (int i = 5; i > 0; i--) {
    nums.push_back(Hage(static_cast<float>(i + 0.5f)));
  }

  std::sort(nums.begin(), nums.end(), cmp_obj);
  for (std::vector<Hage>::iterator iter = nums.begin(); iter != nums.end(); iter++) {
    std::cout << iter->val << std::endl;
  }

  return 0;
}