C / C++ / MFC

Class A Constructor called
Class B Constructor called
Class C Constructor called
Class D Constructor called
A::Display()

George_George wrote:

You code runs ok without any compile/build warning/errors.

George_George wrote:

So, you mean virtual inheritance makes one copy of both methods and data?

George_George wrote:

But when overriding only in one class, there is no compile error regarding the ambiguity issue, why??

George_George wrote:

"In that case i think preference is given to overridden method." -- you mean when calling D.Display, there are two choices,

1. D::B::Display;
2. D::C::A::Display.

But since (1) is "more" overridden than (2), (1) is preferred,

SRKSHOME wrote:

void Set(const char* name)
{

if(name!=NULL && strlen(name))
{
m_name = new char[strlen(name)+1];
strcpy(m_name,name);
}
else
delete [] m_name;
}

class test
{
	char* m_name;
public:
	test():m_name(NULL)
	{}
	void Set(const char* name)
	{
		// Leave the data untouched on invalid input
		if( name == NULL || 0 == strlen(name))
			return;

		if( m_name )
			delete []m_name;

		// Validate the pointer after allocating if necessary or put try/catch if exception enabled
		m_name = new char[strlen(name)+1]; 
		strcpy(m_name,name);
	}
	~test()
	{
		if( m_name ) 
                     delete [] m_name;
	}
	void display()
	{
		cout<<m_name<<endl;
	}
};