When I see placeholder variables ("_1", "_2", etc.) in Boost.Bind, the first thing that comes to my mind is, what are the effects of this on reentrancy and thread-safety in the Boost.Bind library?  What must one watch out for when attempting to use the Boost.Bind library in a multithreaded program?

Is it possible to make effective use of the Boost.Bind library while ignoring the ("_1", "_2", etc.) placeholder variables?

The "Proposal to Add an Enhanced Binder to the Library Technical Report" of 2003-02-28 doesn't address these concerns, so I'm asking them here.

Thanks.

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