question on instances

[Alan Lee]

Hi, I am wondering if there is a way to create a class where only one
predefined instance is allowed. I am just trying to find a way to create a
global variable with its own member functions whhich would be accessible by
all other classes. I could just follow the normal class thing but I'm
wondering if there is a better way to do it.thanks .

[Pete]

Alan Lee wrote:

Hi, I am wondering if there is a way to create a class where only one
predefined instance is allowed. I am just trying to find a way to
create a global variable with its own member functions whhich would
be accessible by all other classes. I could just follow the normal
class thing but I'm wondering if there is a better way to do
it.thanks .

Google for the "Singleton pattern", or put your data and functions into a
namespace.

- Pete

[Pete]

Alan Lee wrote:

Hi, I am wondering if there is a way to create a class where only one
predefined instance is allowed. I am just trying to find a way to
create a global variable with its own member functions whhich would
be accessible by all other classes. I could just follow the normal
class thing but I'm wondering if there is a better way to do
it.thanks .

Google for the "Singleton pattern", or put your data and functions into a
namespace.

- Pete

[jeffc]

"Alan Lee" <al*****@stanford.edu> wrote in message
news:c4**********@news.Stanford.EDU...

Hi, I am wondering if there is a way to create a class where only one
predefined instance is allowed. I am just trying to find a way to create a global variable with its own member functions whhich would be accessible by all other classes. I could just follow the normal class thing but I'm
wondering if there is a better way to do it.thanks .

Search the web for the "singleton" pattern. Typically, you must make the
constructor private or protected, and then provide a static function that
users can call to get a new object. It will only allow 1 object to exist at
a time.

[jeffc]

"Alan Lee" <al*****@stanford.edu> wrote in message
news:c4**********@news.Stanford.EDU...

Hi, I am wondering if there is a way to create a class where only one
predefined instance is allowed. I am just trying to find a way to create a global variable with its own member functions whhich would be accessible by all other classes. I could just follow the normal class thing but I'm
wondering if there is a better way to do it.thanks .

Search the web for the "singleton" pattern. Typically, you must make the
constructor private or protected, and then provide a static function that
users can call to get a new object. It will only allow 1 object to exist at
a time.