[cdl-studenti] [OOP] Eliberare automata de memorie.
Dan-George Filimon
dangeorge.filimon at gmail.com
Sat Mar 6 16:26:00 EET 2010
Nu inteleg de ce ai in definitia operatorului + o noua alocare de memorie.
De ce nu folosesti pointerul this?
Cand faci un operator ca + m-as gandi ca ai ceva de genul:
mine operator+(const mine x) {
memcpy(this->u, x.u, 10000 * sizeof(int));
return *this;
}
Asta nu ar face ce vrei?
On Mar 6, 2010, at 4:20 PM, marius Dragus wrote:
> Salut,
>
> Incerc sa scriu o clasa "mine" in C++ care sa permita operatorul +.
> Problema este ca fiecare obiect aloca dinamic un array, iar o operatie de genul x =a +b+c ar cauza memory leak-uri.
>
> Cum s-ar putea face asta?
>
> Mai jos este codul. Mentin un contor al constructorilor/destructorilor, si se vede evident ca se obtin memory leakuri.
>
> Mersi,
> Marius
>
> /*************************CODE*********************/
>
> #include <iostream>
>
> int count = 0;
> using namespace std;
>
> struct mine
> {
> int * u;
> mine()
> {
> u = new int[10000];
> count++;
> }
>
> ~mine()
> {
> delete[] u;
> count--;
> }
>
> mine & operator=(const mine & x)
> {
> //cout << "assign" << endl;
> u = x.u;
> }
>
>
> };
>
> mine& operator+(const mine & x, const mine &y)
> {
> mine * ret = new mine;
> return *ret;
> }
>
> int main()
> {
>
> mine a, b, c, d;
> mine e;
>
>
> for (int i = 0; i<10; i++)
> {
> e = a + b + c + d;
>
> }
>
> cout << count << "\n"; // afiseaza 35 desi ar trebui sa fie 5
>
> return 0;
> }
>
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