virtual-destructor

virtual destructor fail using array

I found this code on a web site #include <iostream> using namespace std; struct Base { Base() { cout << \"Base\" << \" \"; }[详细]

2023-04-13 06:30 分类：问答

Why do we have a virtual destructor and not a virtual constructor in c++?

Why can we have a virtual destructor but not virtual开发者_Go百科 constructor?The constructor chain can be determined at compile time, because you use new ClassName() always from the most specific cla[详细]

2023-04-12 19:47 分类：问答

Calling Inherited IUnknown::Release() in a destructor

Why does calling the inherited IUnknown::Release() function on a IWICImagingFactory object in a destructor cause a \"CXX0030: Error: expression cannot be evaluated\" to be shown each entry in the obje[详细]

2023-04-09 22:05 分类：问答

Is there a difference between calling a member function from a leaf class in or out of the destructor body?

I have a specific case which is hard to isolate in a code snippet here but I can explain it... I have a class A : public B and A has a member pointer of some type foo * f. In the virtual destructor f[详细]

2023-04-08 22:47 分类：问答

What is this error message about implicitly deleted virtual destructors?

I\'ve just updated GCC from (I think) 4.5.6 to 4.6.1, under Windows, MinGW. Suddenly my NonInstantiable base class (from which you inherit with public virtual to prevent instantiation) refuses to work[详细]

2023-04-08 21:10 分类：问答

When and why should destructor in base class NOT be defined as virtual?

This example below illustrates how to prevent derived class from being copied. It\'s based on a base class where both the copy constructor and copy assignment operator are declared private.[详细]

2023-03-27 13:06 分类：问答

Why are destructors not virtual by default [C++]

Why doesn\'t C++ make destructors virtual by default for classes that have at least one other virtual function?In this case adding a virtual destructor costs me nothing, and not having one i开发者_Sta[详细]

2023-03-18 16:41 分类：问答

Code crashes when derived class' destructor is virtual and base class' dtor is not

I tried the following code on gcc 4.4.5. If the member \'data\' is not present, the code executes fine, but in its presence, it crashes. It also doesn\'t crash when the derived class\' dtor is not vi[详细]

2023-03-09 06:15 分类：问答

Is it valid to directly call a (virtual) destructor?

In this answer, Ryan directly calls the virtual destructor. I\'ve tested the code in VS2010, and it correctly calls all destructors (tested with logging statements). Is it actually valid to do so? Wha[详细]

2023-03-06 19:22 分类：问答

Virtual destructor when using upcasting

Everyone says that a destructor should be virtual when at least one of class methods is virtual. My questions is, isn\'t it correct to say that a destructor should be virtual when using upcasting ?[详细]

2023-03-06 04:16 分类：问答