C + + implementation of the headfirst design pattern-Observer mode (OBSERVER)

WeatherData.h

1 #ifndef weatherdata_h_included2 #defineweatherdata_h_included3 4#include <Set>5#include"Display.h"6 7 classWeatherdata8 {9  Public:Ten     voidmeasurementschanged (); One     voidRegisterobserver (Display *p_display); A     voidRemoveobserver (Display *p_display); -  - Private: the     intGettemperature () {return  -; } -     intGethumidity () {return  -; } -     intGetpressure () {return  -; } -  +STD::Set<display *>m_p_displays; - }; +  A #endif //weatherdata_h_included

WeatherData.cpp

1#include"WeatherData.h"2 3 voidweatherdata::measurementschanged ()4 {5      for(std::Set<display *>::iterator it = M_p_displays.begin (); It! = M_p_displays.end (); it++ )6     {7(*it)Update (Gettemperature (), gethumidity (), getpressure ());8     }9 }Ten  One voidWeatherdata::registerobserver (Display *p_display) A { - M_p_displays.insert (p_display); - } the  - voidWeatherdata::removeobserver (Display *p_display) - { - m_p_displays.erase (p_display); +}

Display.h

1 #ifndef display_h_included2 #definedisplay_h_included3 4 classDisplay5 {6  Public:7     Virtual voidUpdateintTempintHumidity,intpressure) =0;8 };9 Ten #endif //display_h_included

CurrentConditionsDisplay.h

1 #ifndef currentconditionsdisplay_h_included2 #definecurrentconditionsdisplay_h_included3 4#include <iostream>5#include"Display.h"6 7 classCurrentconditionsdisplay: PublicDisplay8 {9  Public:Ten     voidUpdateintTempintHumidity,intpressure) {Std::cout <<"Currentconditionsdisplay"<< Temp <<"-"<< Humidity <<"-"<< pressure <<Std::endl;} One }; A  - #endif //currentconditionsdisplay_h_included

StatisticsDisplay.h

1 #ifndef statisticsdisplay_h_included2 #definestatisticsdisplay_h_included3 4#include <iostream>5#include"Display.h"6 7 classStatisticsdisplay: PublicDisplay8 {9  Public:Ten     voidUpdateintTempintHumidity,intpressure) {Std::cout <<"Statisticsdisplay"<< Temp <<"-"<< Humidity <<"-"<< pressure <<Std::endl;} One }; A  -  - #endif //statisticsdisplay_h_included

ForcastDisplay.h

1 #ifndef forcastdisplay_h_included2 #defineforcastdisplay_h_included3 4#include <iostream>5#include"Display.h"6 7 classForcastdisplay: PublicDisplay8 {9  Public:Ten     voidUpdateintTempintHumidity,intpressure) {Std::cout <<"Forcastdisplay"<< Temp <<"-"<< Humidity <<"-"<< pressure <<Std::endl;} One }; A  - #endif //forcastdisplay_h_included

Main.cpp

1#include"WeatherData.h"2#include"CurrentConditionsDisplay.h"3#include"StatisticsDisplay.h"4#include"ForcastDisplay.h"5 6 intMain ()7 {8 Weatherdata Weather_data;9 Ten Currentconditionsdisplay Current_conditions_display; One Statisticsdisplay Statistics_display; A Forcastdisplay Forcast_display; -  -Weather_data.registerobserver (&current_conditions_display); theWeather_data.registerobserver (&statistics_display); -Weather_data.registerobserver (&forcast_display); -  - weather_data.measurementschanged (); +  -Weather_data.removeobserver (&statistics_display); +  A weather_data.measurementschanged (); at  -     return 0; -}

C + + implementation of the headfirst design pattern-Observer mode (OBSERVER)