C++ delete [] 对象导致崩溃

Question

我制作了一个动态对象数组。当我调用 delete[] 时，程序崩溃并停止响应。但它有奇怪的行为:调用所有析构函数并崩溃。看看这段代码和输出。所有数组的所有内存都已分配。

//main file
#include "myobject.h"

int size;
myObject *foo;

//some operations to estimate size

foo = new myObject[size];

//some operations with myObject

std::cout<<"size: "<<size<<"\n";
std::cout<<"Deleting object\n";

size=0;
delete [] foo;

下一个文件:

//myobject.h

class myObject
{
    public:
    int number;

    Object1 ob1[64]
    Object2 *ob2;

    myObject(){ };
    ~myObject()
    {
        std::cout<<"delete "<<number<<"\n";

        delete [] ob1;
        delete [] ob2;
    };
}

输出:

size: 11

Deleting object

delete 10

delete 9

delete 8

delete 7

delete 6

delete 5

delete 4

delete 3

delete 2

delete 1

delete 0

然后它崩溃并停止响应。

Answer 1

您只能对 new[] 返回的指针调用 delete[]，并且您必须只执行一次。这同样适用于 delete 和 new。

特别是，您不能delete[] obj1，因为它是一个内置数组，而不是指针，而obj2 仅当它指向分配的未释放内存时新[]。