Alert.h

Go to the documentation of this file.

#ifndef _ALERT_
#define _ALERT_

#include <sstream>
#include <string>

class Alert {
public:
  enum Mode_t {
    MODE_ERR,
    MODE_WARN,
    MODE_MSG
  };

  struct ERROR {};
  struct WARNING {};
  struct MESSAGE {};
  
  struct SHOW {};

public:
  Alert() : mode(MODE_MSG) {}
  virtual ~Alert() {}

  virtual void display();

protected:
  std::string msg;
  Mode_t mode;

  friend Alert& operator<<(Alert& a, const std::string &s);
  friend Alert& operator<<(Alert& a, ERROR);
  friend Alert& operator<<(Alert& a, WARNING);
  friend Alert& operator<<(Alert& a, MESSAGE);
};

template<typename T>
Alert& operator<<(Alert& a, const T &o)
{
  std::ostringstream os;
  os << o;
  return a << os.str();
}

Alert& 
operator<<(Alert& a, const std::string &s);
inline Alert& 
operator<<(Alert& a, Alert::ERROR) { a.mode = Alert::MODE_ERR; return a;}
inline Alert&
operator<<(Alert& a, Alert::WARNING) { a.mode = Alert::MODE_WARN; return a; }
inline Alert&
operator<<(Alert& a, Alert::MESSAGE) { a.mode = Alert::MODE_MSG; return a; }
inline Alert&
operator<<(Alert& a, Alert::SHOW) { a.display(); return a; }

extern Alert& alert;

#endif

---