[ALACPP] Singleton clarification

["Jon Stewart" <stew1@xxxxxxxxxxx>]

In the Singletons chapter, Alexandrescu points out that you must make
SingletonHolder a friend of your singleton type if you are taking the
normal precautions of privatizing your type's constructors; he doesn't
show any example code, however. I tried this, and got some compiler
errors.

To use Loki's SingletonHolder, you need to make your chosen CreationPolicy 
a friend of your type, NOT SingletonHolder. E.g.:

class Foo {
	friend struct Loki::CreateUsingNew< Foo >;
};


I think Singleton is possibly the easiest to use component of Loki; 
singletons present themselves all the time and there's no excuse not to 
have Loki handle the mess for you.



Jon
-- 
Jon Stewart
stew1@xxxxxxxxxxx
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