问题描述
我得不到的东西：
我们说：
ref class Base {
virtual void SomeVirtualFunction（）
{Console :: WriteLine（L" Base"）;}
public：
void SomeAccessibleFunction（）
{SomeVirtualFunction（）;}
};
ref class派生：public Base {
virtual void SomeVirtualFunction（）
{Console :: WriteLine（L" Derived"）;}
};
int main（array< System :: String ^> ^ args）
{
Base ^ handle = gcnew Derived（）;
handle- > SomeAccessibleFunction（）;
返回0;
}
我希望得到Derived ;结果吧？但是，我得到了
" Base"以及编译时的奇怪警告：
" .\PrivateVirtual.cpp（8）：警告C4486： ''Base :: SomeVirtualFunction''：
a ref类或值类的私有虚方法应该标记
''密封''
.. \ _PrivateVirtual.cpp（16）：警告C4486：
''派生:: SomeVirtualFunction''：参考的私有虚方法
类或值课程应标记为''密封''
"
如果我尝试明确覆盖：
。 .\PrivateVirtual.cpp（17）：错误C3671：''派生:: SomeVirtualFunction''
：函数不会覆盖''Base :: SomeVirtualFunction''
..\PrivateVirtual.cpp（16）：警告C4486：
''派生:: SomeVirtualFunction''：参考的私有虚方法
类或值类应该标记为''密封''
这里发生了什么？
Something I don''t get it:
Say we have:
ref class Base {
virtual void SomeVirtualFunction()
{Console::WriteLine(L"Base");}
public:
void SomeAccessibleFunction()
{SomeVirtualFunction();}
};
ref class Derived : public Base {
virtual void SomeVirtualFunction()
{Console::WriteLine(L"Derived");}
};
int main(array<System::String ^> ^args)
{
Base^ handle = gcnew Derived();
handle->SomeAccessibleFunction();
return 0;
}
I would expect to get "Derived" as the result, right? However, I get
"Base", and strange warnings during compilation:
".\PrivateVirtual.cpp(8) : warning C4486: ''Base::SomeVirtualFunction'' :
a private virtual method of a ref class or value class should be marked
''sealed''
..\PrivateVirtual.cpp(16) : warning C4486:
''Derived::SomeVirtualFunction'' : a private virtual method of a ref
class or value class should be marked ''sealed''
"
If I try explicit overriding:
..\PrivateVirtual.cpp(17) : error C3671: ''Derived::SomeVirtualFunction''
: function does not override ''Base::SomeVirtualFunction''
..\PrivateVirtual.cpp(16) : warning C4486:
''Derived::SomeVirtualFunction'' : a private virtual method of a ref
class or value class should be marked ''sealed''
What is going on here?
推荐答案
" private"虚函数没用！因为没有人可以覆盖它！
你需要声明你的虚拟功能至少为受保护！
-
问候
Jochen
关于Win32和.NET的博客
"私人"虚函数没用！因为没有人可以覆盖它！
你需要声明你的虚拟功能至少为受保护！
"private" virtual functions are useless! because nobody can overwrite
it!
You need to declare your virtual functions at least as "protected"!
但是请注意，这仅适用于托管代码。在真正的C ++中，它将会工作！
Bo Persson
But note that this is so for managed code only. In real C++ it would
have worked!
Bo Persson
这篇关于VC ++ 2005：私有虚函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！