C ++中的析构函数和继承？ [英] Destructors and inheritance in C++?

问题描述

我使用Borland C ++ Builder。

I use Borland C++ Builder.

我有问题

#include <Classes.hpp>
class TMyObject : public TObject
{
   __fastcall TMyObject();
   __fastcall ~TMyObject();//I would like to inherite my destructor from TObject
};

__fastcall TMyObject::TMyObject() : TObject()//it will inherited my constructor from TObject
{
}

对于将继承〜TObject 的新析构函数？

And for that new destructor that will inherite ~TObject?

__fastcall TMyObject::~TMyObject?????????????

推荐答案

TObject 的级别。它的析构函数必须是虚拟的：

This can be solved at TObject's level. Its destructor has to be virtual:

#include <Classes.hpp>
class TObject 
{
   __fastcall TObject();
   virtual __fastcall ~TObject(); 
};

这样你可以做：

TObject * pobj = new TMyObject();
delete pobj;

或

TMyObject * pobj = new TMyObject();
delete pobj;

两个析构函数都会被调用（〜TMyObject（）先然后〜TObject（）），你就没有泄漏了。

Both destructors will be called (~TMyObject() first and then ~TObject()) and you will have no leak.

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