I'm trying to fix up the I/O library submission I gave a few months ago, and came up with an issue with a copy constructor and GCC. I explicitly wrote a copy constructor for a new stream-buffer class template. I just added test code that used that constructor. Everything ran fine on my Metrowerks compiler, but Project Builder (which uses GCC) choked.
One of the reasons was that GCC made the basic_streambuf class template noncopyable. It referred to a DR # 50. The standard currently has streambuf copying unspecified (in the normal-life sense, not the C++ sense), so it should automatically be copyable. My code took advantage of that. The copying isn't too useful, especially since streams are explicitly noncopyable. Should I just remove that code?
I'm not aware of anything in the standard, or in the defects list (including #50) that says a std::basic_streambuf is not copyable.
DR 50 states that ios_base is not copyable. And it is true that Metrowerks currently allows ios_base to be copied. The semantics of this support basic_ios::copyfmt. And non-copyability is introduced at the basic_ios level.
-Howard
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