Turn on tmpl shared_ptr methods for MSVC

[mred314]

Can you turn on the templated shared_ptr (copy?) 
constructor and assignment operator in MSVC++ (by 
checking for BOOST_MSVC6_MEMBER_TEMPLATES)?  And/or 
publish the work-around (define a base class for 
templated shared_ptr) given in the Yahoo group?  It's 
very useful.  Three problems with simply turning them 
on, with workarounds (are there other problems?): (1) 
Compiler error.  Just put the standard copy 
constructor and assignment operator after the template 
versions. (2) Silent failure if copying shared_ptr 
with same pointer type (MSVC++ generates its own copy 
constructor instead of using the templated 
constructor.)  It works as long as the normal copy 
constructor is defined (which is already the case.)  
(3) No templated friends.  Just don't do "private" 
(this workaround is already in place for other 
platforms.)  Attached is smart_ptr.hpp (modified from 
1_21_2) with the templated members simply turned on.

[beman_dawes]

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Gary Powell submitted essentially the same request, and his 
suggested changes have been checked into CVS