[CSI] final topics

[Mikhail Nesterenko]

> 
> What is a static constant? In particular, what is the difference between the use of static const and const, as in: 
> 
> class Date {
> public:
>   ...
> private:
>    static const int cent21 = 2001;
>    ...
> };
> 
> and this: 
> 
> class Date {
> public:
>   ...
> private:
>    const int cent21 = 2001;
>    ...
> };
> 


A static constant is shared by all objects of the class while
(non)-static constant may potentially be different for different
objects. For example, a constant my be initialized with the
initializer list. Consider the following class:

   class Date{
   public:
	Date(int c): cent21(c) {}
   private:
	const int cent21;
   };


The objects for this class may be declared as follows:

    Date  d1(55), d2(66);

The two objects would have cent21 intialized to different values.

Thanks,
--
Mikhail