[boost] Added auto_temp_buf to sandbox

[Daryle Walker]

In the Boost sandbox CVS, I added to the memory library auto_temp_buf, 
a variant of std::auto_ptr based on the rarely used standard temporary 
buffer functions.  It's in the following files

        ROOT/boost/memory_fwd.hpp [changed]
        ROOT/boost/memory/auto_temp_buf.hpp
        ROOT/boost/libs/memory/doc/auto_temp_buf.html
        ROOT/boost/libs/memory/example/auto_temp_buf_example.cpp
Comments?

I have it working on my CodeWarrior installation.  It was working on my 
GCC installation until I put the definitions of the conversion 
operators outside the class definition; I think it's mis-parsing the 
"safe_bool" definition as a member-function, not a data-member.  (I 
just updated my Project Builder with the Dec 2002 and Jun 2003 updates, 
but I have the GCC 3.3 stuff turned off, so it's GCC 3.1.)

Daryle

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