From: "Andrew J Bromage" <ajb@[...].net> 
>  G'day all.
> 
>  In retrospect I shouldn't have brought up a "more powerful"
>  call_once function, because that's not what I want at all.  What
>  I "really" want is this:
> 
>  class once
>  {
>  public:
>  once();
>  ~once();
>  call_once(function0<void>&);
>  };

Are you sure that you want that. The whole point of the

template<class F>  void call_once(F f, once_flag & flag);

construct is that once_flag is a POD, and can be statically initialized, so
you don't have to worry about initialization order issues.

Your "once" object is dynamically initialized. It is pretty much the same as
a boost::mutex; there is no reason for it to be more efficient than a mutex.


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