Making a Constructor Exception-Safe - C++ Class

C++ examples for Class:Constructor

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Description

Making a Constructor Exception-Safe

Demo Code

#include <iostream>
#include <stdexcept>

using namespace std;

class Device {//  w ww . j  av a 2s  .c  o  m
public:
   Device(int devno) {
      if (devno == 2)
         throw runtime_error("Big problem");
   }
  ~Device() {}
};

class Broker {

public:
   Broker (int devno1, int devno2) :
      dev1_(NULL), dev2_(NULL) {
      try {
         dev1_ = new Device(devno1);  // Enclose the creation of heap
         dev2_ = new Device(devno2);  // objects in a try block...
      }
      catch (...) {
         delete dev1_;                // ...clean up and rethrow
         throw;                     
      }
   }
  ~Broker() {
      delete dev1_;
      delete dev2_;
   }

private:
   Broker();
   Device* dev1_;
   Device* dev2_;
};

int main() {

   try {
      Broker b(1, 2);
   }
   catch(exception& e) {
      cerr << "Exception: " << e.what() << endl;
   }
}

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