Re: [boost] Thread-safe singleton pattern

Subject: Re: [boost] Thread-safe singleton pattern
From: GMan (gmannickg_at_[hidden])
Date: 2010-01-25 20:44:44

This suffers from the same problems as your last singleton. (Probably should
have kept it in that discussion, by the way.). Also, instead of forcing
people to have threaded or not, make it a policy.

On Mon, Jan 25, 2010 at 3:49 PM, Andrew Chinkoff <achinkoff_at_[hidden]>wrote:

> I propose thread safe singleton pattern implementation
> (see http://www.research.ibm.com/designpatterns/pubs/ph-jun96.txt).
>
> I have attached "singleton.hpp" to this letter.
>
> Below is the test program:
>
> #include <stdio.h>
> #include <singleton.hpp>
>
> class A : public boost::Singleton<A>
> {
>    //
>    // Only Singleton class can create and delete us!
>    //
>    SINGLETON_IS_MY_FRIEND;
> public:
>    void foo(){ printf("foo!\n"); }
>    A(){ printf("A()\n"); }
>    ~A(){ printf("~A()\n"); }
> };
>
> void main()
> {
>    // It is not compiled:
>    //A a = A::Instance();
>    // That is exactly as it should be used:
>    A::Instance().foo();
> }
>
> Test program outputs:
> A()
> foo!
> ~A()
>
> My question: Does Boost community think that boost::Singleton is convenient
> (or successful) solution?
>
> _______________________________________________
> Unsubscribe & other changes:
> http://lists.boost.org/mailman/listinfo.cgi/boost
>

-- 
GMan, Nick Gorski