Why did you make streambufs noncopyable?

[Daryle Walker]

One of my projects has me writing a class (template) that derives from 
std::basic_streambuf.  I added a copy constructor to my class that 
calls the base-class copy constructor, then copies my extra data.  As 
soon as I wrote an unit test that called the copy constructor, your 
compiler complained that streambufs were noncopyable.

I'm using an eMac running Mac OS X 10.2.6 with the July 2002 developer 
tools (actually the August 2002 tools with the October 2002 
anti-update) installed.  It runs "gcc (GCC) 3.1 20020420 (prerelease)", 
which is Apple-modified.

The standard has the copying operations of std::basic_streambuf 
unspecified (in the regular-world sense, not the C++ sense), so that 
class template should get copying operations by default.  I took 
advantage of that in my class template.  However, your streambuf code 
explicitly makes streambufs noncopyable (by making the copy constructor 
and assignment operator private).  It claims DR 50 as the reason, but 
that DR (at 
<http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-defects.html#50>) only 
mentions std::ios_base!

Why did you make the change?  Is it corrected in later versions?  If 
you're not going to correct it, how should I block the code off (with 
the preprocessor)?

Daryle