i_predicate.h

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#ifndef DATATOOLS_I_PREDICATE_H
#define DATATOOLS_I_PREDICATE_H

// Standard Library:
#include<functional>

namespace datatools {

  template <class T>
  class i_predicate
    : public std::unary_function<const T&, bool>
  {
  public:
    virtual bool operator()(const T & obj_) const = 0;
  };


  template<class Mother, class Daughter>
  class mother_to_daughter_predicate
    : public i_predicate<Daughter>
  {
  public:

    mother_to_daughter_predicate(i_predicate<Mother> & mother_predicate_)
    {
      _mother_predicate_ = &mother_predicate_;
      return;
    }

    virtual bool operator()(const Daughter& obj) const
    {
      return (*_mother_predicate_)(obj);
    }

  private:

    i_predicate<Mother> * _mother_predicate_;

  };

} // end of namespace datatools

#endif // DATATOOLS_I_PREDICATE_H

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