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the cost of Singleton::instance()

To: yade-dev@xxxxxxxxxxxxxxxx
From: Václav Šmilauer <eudoxos@xxxxxxxx>
Date: Fri, 09 May 2008 09:23:38 +0200
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Hello (Janek primarily),

can you estimate the cost of calling Omega::instance()? I see it creates
a mutex, but I don't know how much that costs. I have another option of
passing optional MetaBody* mb and then

 (mb?mb:Omega::instance().getRootBody().get())->physicalActions->/*...*/

Is it worth the pain or do I always use Omega::instance() without penalty?

Regards, V.
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