Re: Class Object Declarations
cdg wrote:
I have simple question about class declarations in Visual 6. If I create
a generic class using the "new class" wizard in the "Insert" menu, isn't it
correct that an object of this class has to created with a statement such
as:
Demo Info;
Then any member function call uses the dot operator. And this is not
using any control member variables, since this would not be a resource
class. And the declaration of the object not the class, would have to made
manually. However, where is this type of declaration placed? Any information
about this would be helpful.
The wizard adds an empty class, with a cpp file and h file, to the
project. You are correct that this does not create an object. A class
is only a plan, like a blueprint, and then your code is responsible for
creating objects where and when you need.
Here are several ways to create an object:
CDemo Info1; // in static memory
void function()
{
CDemo Info2; // on the stack
CDemo* pInfo3 = new CDemo(); // on the heap
}
class x {
CDemo m_Info4; // part of another class
};
The dot operator is used with Info1 and Info2, but the -> operator is
used when you have an object pointer such as pInfo3.
Where to place an object declaration depends on your design and needs.
All of the above examples are commonly useful. (And, there are other
ways too.)
All of these issues are about the fundamentals of the C++ language.
"control member variables" are an unrelated MFC concept.
--
Scott McPhillips [VC++ MVP]