[boost] Added auto_array to sandbox

[Daryle Walker]

In the Boost sandbox CVS, I started a memory library with auto_array, 
an array-based variant of std::auto_ptr.  It's in the following files

        ROOT/boost/memory_fwd.hpp
        ROOT/boost/memory/auto_array.hpp
        ROOT/boost/libs/memory/doc/auto_array.html
        ROOT/boost/libs/memory/test/auto_array_test.cpp
Comments?  It seems fairly simple, so maybe I can propose it for review 
soon.

I have one problem.  I wrote the unit test to try all the member 
functions.  However, when I stepped through the code with the debugger 
of one of my compilers, I missed the constructor that takes an 
auto_array_ref.  That constructor is supposed to have been used in the 
test's "f" object, but the regular copy constructor was used instead.  
Is it a compiler over-optimization or am I missing a subtle C++ rule?  
How can I test that constructor (all other member functions do get at 
least one pass)?

Daryle

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