BigInt Variante mit Dynamic Memory

class BigInt
 {
 private:
   int * number;              // simple pointer
   int ndig;                  // count digits
  ....
 // implementation file for class BigInt
 //
 BigInt::BigInt(char * str)
 {
   int len = strlen(str);
   number = new int[len+1]; 

Jetzt müssen Copy-Constructor, Zuweisungsoperator und Destructor definiert und (sorgfältig) implementiert werden

ansonsten Speicherüberschreiben, Memory-leaks, etc

class BigInt
 {
 private:
   int * number;       // simple pointer
   int ndig;           // count digits
  ....
   BigInt(const BigInt & x ); // copy const
   ~ BigInt(); // destructor
   BigInt & operator = (const BigInt & x);
  ....
 // implementation file for class BigInt
 //
 BigInt::BigInt(char * str)
 {
   int len = strlen(str);
   number = new int[len+1];// allocate memory
 ...
 BigInt::BigInt(const BigInt & b)
 { // copy constructor
   int len = b.ndig;
   number = new int[len];// allocate memory
 ... // Rest wie std constructor
 BigInt & BigInt::operator = (const BigInt & b);
 { // = constructor
   int len = b.ndig;
   number = new int[len];// allocate memory
 ... // Rest wie std constructor
    return (*this);
 }
 BigInt::~ BigInt()
 { // destructor
   delete[] number;
   number = NULL;
 ...
 }