Another implementation of the single-piece Mode

This is an implementation of a C ++ single-piece Pattern Board class. The implementation of this class is different from the traditional implementation using inheritance or macro.
Here singleton_holder is actually a class package.

Template <typename T>
Class singleton_holder
{
Public:
Typedef T obj_type;
Static T & instance ()
{
Static T obj;
Return obj;

}

Private:
Singleton_holder ();
Singleton_holder (const singleton_holder & s );
Singleton_holder & operator = (const singleton_holder & s );
~ Singleton_holder ();

};
 

Class application_impl
{
Public:
Void run ()
{
Std: cout <"this is a testb" <std: endl;
}

}

Typedef singleton_holder <application_impl> application;
Void main ()
{
Application: obj_type & app = application: instance ();
App. run ();

Author: tbw