comparators.hpp

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#pragma once
 
namespace tu
{
 
  struct is_non_zero
  {
    is_non_zero() :
      _valid(false)
    {
 
    }
 
    void operator()(int value)
    {
      if (value != 0)
        _valid = true;
    }
 
    bool operator()()
    {
      bool result = _valid;
      _valid = false;
      return result;
    }
 
  private:
    bool _valid;
  };
 
  struct is_all_ones
  {
    is_all_ones() :
      _valid(true)
    {
 
    }
 
    void operator()(int value)
    {
      if (value == 0)
        _valid = false;
    }
 
    bool operator()()
    {
      bool result = _valid;
      _valid = true;
      return result;
    }
 
  private:
    bool _valid;
  };
 
  template <typename T, typename Less = std::less <T> >
  struct vector_less
  {
    vector_less(const std::vector <T>& data, Less less = Less()) :
      _less(less), data_(data)
    {
 
    }
 
    bool operator ()(size_t i, size_t j)
    {
      return _less(data_[i], data_[j]);
    }
 
  private:
    Less _less;
    const std::vector <T>& data_;
  };
 
} /* namespace tu */