指針內存泄漏

Question

我的指針p在一個函數內部，此代碼會導致內存泄漏。

for(k=0;k< 3;k++)
{

    int *p=NULL;
    int val = bBreak[k+1] - bBreak[k];

    p = new int [val+1];
    p = &buff[bBreak[k]];

    for(int i=0;i< val;i++)
        {

            cout<<"\n"<<p[i]<<endl;

        }

    }

Answer 1

是! 您永遠不會釋放內存。 您應該為通過new/new[]分配的每條內存調用delete/delete[] new/new[] 。

Answer 2

是的你將會

p = new int [val+1]; //allocate array on the heap
p = &buff[bBreak[k]]; //new allocated array is leaked because you lost the pointer to it
//and you are not able to call 'delete[]' to free the memory

通常，對new運算符的每次調用都應與對operator delete或delete[]調用配對使用

Answer 3

是。 您必須使用new delete分配的每個內存。

p = new int [val+1];
p = &buff[bBreak[k]]; // here you lose track of the memory you've just allocated

如果您不想手動進行內存管理，請使用std::vector<int> 。