Re: [boost] [Boost.utility]

Subject: Re: [boost] [Boost.utility]
From: Andrew Chinkoff (achinkoff_at_[hidden])
Date: 2010-01-26 13:10:19

Thread-safe (instance_ == NULL) comparison:

static T& Instance()
{
        /**
          Perform the Double-Check pattern.
          See http://www.research.ibm.com/designpatterns/pubs/ph-jun96.txt.
         */
        if (instance_ == NULL)
        {
                boost::mutex::scoped_lock locker(mtx_instance_);
                if (instance_ == NULL)
                {
                        instance_ = new T();
                        destroyer_.set_doomed(instance_);
                }
        }
        return *instance_;
} 
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