C++中未使用虚析构函数导致的内存泄漏

代码

#include <vector>
#include <iostream>
#include "vld.h"

using namespace std;

class Base
{
public:
    Base(){}
    ~Base()
    {
        cout << "Base Destructor" << endl;
    }
};

class Derive : public Base
{
public:
    Derive()
    {
        vecInt.push_back(0);
        vecInt.push_back(2);
    }
    ~Derive()
    {
        cout << "Derive Destructor" << endl;
    }

    vector<int> vecInt;
};

int main(int argc, char ** argv)
{
    Base * a = new Derive();
    delete a;
    return 0;
}

vld内存检查：

Leak Hash: 0xFF7D4793, Count: 1, Total 8 bytes Call Stack (TID 7516): MSVCR100D.dll!operator new() e:\program files (x86)\microsoft visual studio 10.0\vc\include\xmemory (36): TestPrj.exe!std::_Allocate() + 0x15 bytes e:\program files (x86)\microsoft visual studio 10.0\vc\include\xmemory (187): TestPrj.exe!std::allocator::allocate() + 0xB bytes e:\program files (x86)\microsoft visual studio 10.0\vc\include\vector (442): TestPrj.exe!std::_Vector_val >::_Vector_val >() + 0xA bytes e:\program files (x86)\microsoft visual studio 10.0\vc\include\vector (508): TestPrj.exe!std::vector >::vector >() f:\workspace\testprj\testprj\singletest\virtualdestructor.cpp (25): TestPrj.exe!Derive::Derive() + 0x59 bytes f:\workspace\testprj\testprj\singletest\virtualdestructor.cpp (40): TestPrj.exe!test_interface() + 0x2B bytes f:\workspace\testprj\testprj\main.cpp (6): TestPrj.exe!main() + 0xD bytes f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c (555): TestPrj.exe!__tmainCRTStartup() + 0x19 bytes f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c (371): TestPrj.exe!mainCRTStartup() kernel32.dll!BaseThreadInitThunk() + 0x12 bytes ntdll.dll!RtlInitializeExceptionChain() + 0x63 bytes ntdll.dll!RtlInitializeExceptionChain() + 0x36 bytes Data: D8 4C 48 00 00 00 00 00 .LH..... ........

因为基类的析构函数没有加virtual，delete的时候只会释放基类声明的内存块，子类的成员变量占用的内存就忽略了，导致内存泄漏。