Using singleton class instance in another class

[Eugene]

Hi, I got a singleton class. Then in another class (CA), i would declare a
variable with this singleton class and get a reference to it. I would have
another class (IA1) that would inherit from CA and I would want to allow IA1
to access the singleton class. My question is is it better to declare the
singleton class as private or protected in CA? Or shall I let IA1 to get a
reference to the singleton by itself?

Thanks.
Eugene

[Mark R. Dawson]

Hi Eugene,
make the variable protected so that the base and derived class use the
same member variable to reference the Singleton. One benefit of inheritance
is to allow code reuse from the base class.

Mark R Dawson
http://www.markdawson.org
"Eugene" wrote:

Hi, I got a singleton class. Then in another class (CA), i would declare a
variable with this singleton class and get a reference to it. I would have
another class (IA1) that would inherit from CA and I would want to allow IA1
to access the singleton class. My question is is it better to declare the
singleton class as private or protected in CA? Or shall I let IA1 to get a
reference to the singleton by itself?

Thanks.
Eugene

[Jon Skeet [C# MVP]]

Mark R. Dawson <Ma*********@discussions.microsoft.com> wrote:

make the variable protected so that the base and derived class use the
same member variable to reference the Singleton. One benefit of inheritance
is to allow code reuse from the base class.

Alternatively (and preferrably, IMO) provide a protected *property*
rather than a protected variable. If you use the property everywhere in
both classes, that gives you more flexibility if you later change from
the singleton to a factory, for instance.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
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