Simulate such an event-driven system, create an event loop. - C++ Class

C++ examples for Class:Class Creation

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Description

Simulate such an event-driven system, create an event loop.

Demo Code

                                                                                
#include <iostream> 
                                                                                 
class Condition /*w  ww  . j a  va2s. c  om*/
{ 
public: 
    Condition() { } 
    virtual ~Condition() {} 
    virtual void log() = 0; 
}; 
                                                                                 
class Normal : public Condition 
{ 
public: 
    Normal() { log(); } 
    virtual ~Normal() {} 
    virtual void log() 
           { std::cout << "Logging normal conditions ...\n"; } 
}; 
                                                                                 
class Error : public Condition 
{ 
public: 
    Error() { log(); } 
    virtual ~Error() {} 
    virtual void log() { std::cout << "Logging error!\n"; } 
}; 
                                                                                 
class Alarm : public Condition 
{ 
public: 
    Alarm(); 
    virtual ~Alarm() {} 
    virtual void warn() { std::cout << "Warning!\n"; } 
    virtual void log() { std::cout << "General alarm log\n"; } 
    virtual void call() = 0; 
}; 
                                                                                 
Alarm::Alarm() 
{ 
    log(); 
    warn(); 
} 
                                                                                 
class FireAlarm : public Alarm 
{ 
public: 
    FireAlarm() { log();}; 
    virtual ~FireAlarm() {} 
    virtual void call() { std::cout<< "Calling fire department!\n"; } 
    virtual void log() { std::cout << "Logging fire call\n"; } 
}; 
                                                                                 
int main() 
{ 
    int input; 
    int okay = 1; 
    Condition *pCondition; 
    while (okay) 
    { 
         std::cout << "(0) Quit (1) Normal (2) Fire: "; 
         std::cin >> input; 
         okay = input; 
         switch (input) 
         { 
         case 0: 
             break; 
         case 1: 
             pCondition = new Normal; 
             delete pCondition; 
             break; 
         case 2: 
             pCondition = new FireAlarm; 
             delete pCondition; 
             break; 
         default: 
                pCondition = new Error; 
                delete pCondition; 
                okay = 0; 
                break; 
           } 
    } 
    return 0; 
}

Result


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