basics/outputOperator.hh

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/* output operator for all classes in concepts
 */

#ifndef OutputOperator_h
#define OutputOperator_h

#include <iostream>
#include <memory>

namespace concepts {

  // ******************************************************** OutputOperator **

  class OutputOperator {
    friend std::ostream& operator<<(std::ostream& os, const OutputOperator& o);
  public:
    virtual ~OutputOperator();
  protected:
    virtual std::ostream& info(std::ostream& os) const;
  };

  // *********************************** Output operator for a std::auto_ptr<> **

  template<class F>
  std::ostream& operator<<(std::ostream& os, const std::auto_ptr<F>& p) {
    if (p.get()) return os << "&" << *p;  // pointer to value
    return os << "0";
  }

} // namespace concepts


  // *************************************** Output operator for a std::pair<> **

  template<class F, class G>
  std::ostream& operator<<(std::ostream& os, const std::pair<F,G>& p) {
    return os << "std::pair(" << p.first << ", " << p.second << ")";
  }

namespace concepts {

  template<class F, class G>
  std::ostream& operator<<(std::ostream& os, const std::pair<F,G>& p) {
    return os << "std::pair(" << p.first << ", " << p.second << ")";
  }

}

#endif // OutputOperator_h