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2504.basic_streambuf is not an abstract class
Section: 31.6.3 [streambuf] Status: New Submitter: Jonathan Wakely Opened: 2015-05-28 Last modified: 2015-08-03
Priority: 3
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Discussion:
31.6.3 [streambuf] p1 says:
The class template
basic_streambuf<charT, traits>serves as an abstract base class for deriving various stream buffers whose objects each control two character sequences: […]
The term "abstract base class" is not defined in the standard, but "abstract class" is (11.7.4 [class.abstract]).
According to the synopsisbasic_streambuf has no pure virtual functions so is not an abstract class and none of libstdc++, libc++, or dinkumware implement it as an abstract class. I don't believe the wording was ever intended to require it to be an abstract class, but it could be read that way. I suggest the wording be changed to "polymorphic base class" or something else that can't be seen to imply a normative requirement to make it an abstract class.
Proposed resolution:
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