Ошибка в конструкторе копирования класса
20.04.2013, 07:25. Показов 655. Ответов 8
Хотя и делал по образцу, но почему то лезет ошибка записи за пределы динамического массива, хотя и переменные копируются верно (отладчик вижлы подтвердил). конструктор наследованного класса даже не ковырял, т.к. ошибка таже
мэин
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| #include <iostream>
#include "cd.h"
void Bravo (const Cd & disk);
int main () {
Cd c1 ("Beatles", "Capitol", 14, 35.5);
Classic c2 = Classic ("Piano sonata in B flat, Fantasia in C", "Alfred Brendel", "Phillips", 2, 57.17);
Cd *pcd = &c1;
using std::cout;
Cd ad;
ad = c1;
cout << "Using object directly:\n";
c1.Report ();
cout << '\n';
c2.Report ();
cout << "\nUsing type cd * pointer to objects:\n";
pcd->Report ();
pcd = &c2;
pcd->Report ();
cout << "\nCalling a function with a Cd reference argument:\n";
Bravo (c1);
Bravo (c2);
cout << "\nTesting assignment: ";
Classic copy;
copy = c2;
copy.Report ();
std::cin.get ();
return 0;
};
void Bravo (const Cd & disk) {
disk.Report ();
}; |
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хэдэр
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| class Cd {
private:
char * performers;
char * label;
int length;
int selections;
double playtime;
public:
Cd (char * s1, char * s2, int n, double x);
Cd (const Cd & d);
Cd ();
virtual ~Cd ();
virtual void Report () const;
Cd & operator = (const Cd & d);
};
class Classic : public Cd {
private:
char * important;
public:
Classic ();
Classic (char * im, char * s1, char * s2, int n, double x);
Classic (char * im, Cd & temp);
Classic (const Classic & temp);
virtual void Report () const;
Classic & operator = (const Classic & temp);
virtual ~Classic ();
}; |
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методы
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| #include "cd.h"
#include <iostream>
#include <cstring>
Cd::Cd () {
performers = new char [8];
strcpy (performers, "perfomer");
label = new char [4];
strcpy (label, "song");
selections = 0;
playtime = 0;
};
Cd::Cd (char * s1, char * s2, int n, double x) {
performers = new char [strlen (s1) + 1];
strcpy (performers, s1);
label = new char [strlen (s2) + 1];
strcpy (label, s2);
selections = n;
playtime = x;
};
Cd::Cd (const Cd & d) {
performers = new char [strlen (d.performers) + 1];
strcpy (performers, d.performers);
label = new char [strlen (d.label) + 1];
strcpy (label, d.label);
selections = d.selections;
playtime = d.playtime;
};
void Cd::Report () const {
using std::cout;
cout << *performers << ", " << *label << ", " << selections << ", " << playtime;
};
Cd::~Cd () {
delete [] performers;
delete [] label;
};
Cd & Cd::operator= (const Cd & d) {
if (this == &d) return *this;
delete [] performers;
delete [] label;
length = strlen (d.performers);
performers = new char [length + 1];
strcpy (performers, d.performers);
length = strlen (d.label);
label = new char [length + 1];
strcpy (label, d.label);
selections = d.selections;
playtime = d.playtime;
return *this;
};
Classic::Classic () : Cd () {
important = new char [14];
strcpy (important, "Important song");
};
Classic::Classic (char * im, char * s1, char * s2, int n, double x) : Cd (s1, s2, n, x) {
important = new char [strlen (im) + 1];
strcpy (important, im);
};
Classic::Classic (char * im, Cd & temp) : Cd (temp) {
important = new char [strlen (im) + 1];
strcpy (important, im);
};
Classic::Classic (const Classic & temp) : Cd (temp) {
important = new char [strlen (temp.important) + 1];
strcpy (important, temp.important);
};
Classic & Classic::operator = (const Classic & temp) {
if (this == &temp) return *this;
delete [] important;
Cd::operator= (temp);
important = new char [strlen (temp.important) + 1];
strcpy (important, temp.important);
return *this;
};
Classic::~Classic () {
delete [] important;
};
void Classic::Report () const {
Cd::Report ();
std::cout << ", " << important;
}; |
|
другая версия с той же ошибкой
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| Cd & Cd::operator= (const Cd & d) {
if (this == &d) return *this;
delete [] performers;
delete [] label;
length = strlen (d.performers);
performers = new char [length];
strncpy (performers, d.performers,length);
performers [length] = '\0';
length = strlen (d.label);
label = new char [length];
strncpy (label, d.label, length);
label [length] = '\0';
selections = d.selections;
playtime = d.playtime;
return *this;
}; |
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Сообщение от alsav22
