想不通，这段简单的代码会运行出错

[yhgfriend]

编译通过，运行出错，就是函数会多次调用 SENSORS_ABILITY_FOR_TEST 类的析构函数，多次删除同一指针，导致程序出错。调用析构函数的可能原因是 1 是 临时变量 sa,sb在生命同期结束时调用，2 是vector push_pack时拷贝了 SENSORS_ABILITY_FOR_TEST ，最后vector结束时调用了vector容器里的数据的析构函数，但是问题这都是我具体的需要，我感觉代码没问题呀，我应该怎样写才能正常运行呢


//测试类说明： 类里有一个指针 unsigned char * ，LenOfSpcData保存指针指向内存区的长度
class SENSORS_ABILITY_FOR_TEST{
public:
unsigned char * m_SpcData; //用于保存与传感器类型相关的特殊数据
int LenOfSpcData;

public:
SENSORS_ABILITY_FOR_TEST& operator = (const SENSORS_ABILITY_FOR_TEST &src)
{
LenOfSpcData=src.LenOfSpcData;
if(LenOfSpcData)
{
if(m_SpcData)
delete[] m_SpcData;
m_SpcData=new unsigned char[LenOfSpcData];
memcpy(m_SpcData,src.m_SpcData,LenOfSpcData);
}
else
{
if(m_SpcData)
{
delete[] m_SpcData;
m_SpcData=NULL;
}
}

return *this;
}

SENSORS_ABILITY_FOR_TEST()
{
m_SpcData=NULL;
LenOfSpcData=0;
}

~SENSORS_ABILITY_FOR_TEST()
{
if(m_SpcData)
{
delete[] m_SpcData;
m_SpcData=NULL;
}
}
};

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CFrameWndEx::OnCreate(lpCreateStruct) == -1)
return -1;

///vector test
SENSORS_ABILITY_FOR_TEST sa;
sa.LenOfSpcData=12;
sa.m_SpcData=new unsigned char[sa.LenOfSpcData];
memset(sa.m_SpcData,1,sa.LenOfSpcData);

SENSORS_ABILITY_FOR_TEST sb;
sb=sa;
memset(sb.m_SpcData,2,sb.LenOfSpcData);

vector<SENSORS_ABILITY_FOR_TEST> m_SENSORS_ABILITY_TEST,m_SENSORS_ABILITY_TEST1;
m_SENSORS_ABILITY_TEST.push_back(sa);
m_SENSORS_ABILITY_TEST.push_back(sb);
m_SENSORS_ABILITY_TEST1=m_SENSORS_ABILITY_TEST;

vector<SENSORS_ABILITY_FOR_TEST>::iterator it=m_SENSORS_ABILITY_TEST.begin();

return 0;

｝

[yhgfriend]

引用 4 楼 zhao4zhong1 的回复:

https://blog.csdn.net/lujiandong1/article/details/49872697

谢谢，但是我的自定义类里有 构造函数的 SENSORS_ABILITY_FOR_TEST() { m_SpcData=NULL; LenOfSpcData=0; } //------------------------------ 现在问题就是 在构造函数里与析构函数里设断点，发现整段代码，构造函数执行了2次（sa,sb定义时），但析构函数却调用了5次之多。所以导致指针被多次delete 而致程序出错

[yhgfriend]

搞定了，加了一个复制构造函数（以前有重载等号运算符，但是不行），谢谢大家 SENSORS_ABILITY_FOR_TEST(const SENSORS_ABILITY_FOR_TEST &a) { m_SpcData=NULL; LenOfSpcData=0; *this=a; }

[schlafenhamster]

delete[ ] m_SpcData;
为什么是 [ ]

[yhgfriend]

我 new的是数组，对应的delete[]

[赵4老师]

《C++编程思想》

[赵4老师]

https://blog.csdn.net/lujiandong1/article/details/49872697