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3253. basic_syncbuf::basic_syncbuf() should not be explicit

Section: 31.11.2.1 [syncstream.syncbuf.overview] Status: C++20 Submitter: Nevin Liber Opened: 2019-08-06 Last modified: 2021-02-25

Priority: 0

View all other issues in [syncstream.syncbuf.overview].

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Discussion:

When P0935 "Eradicating unnecessarily explicit default constructors from the standard library" was applied, basic_syncbuf was not in the working paper. basic_syncbuf should not have an explicit default constructor.

[2019-09-02 Issue Prioritization]

Status to Tentatively Ready and priority to 0 after seven positive votes on the reflector.

Proposed resolution:

This wording is relative to N4830.

1. Modify 31.11.2.1 [syncstream.syncbuf.overview], class template basic_syncbuf synopsis, as indicated:

   template<class charT, class traits, class Allocator>
   class basic_syncbuf : public basic_streambuf<charT, traits> {
   public:
     […]
     // 31.11.2.2 [syncstream.syncbuf.cons], construction and destruction
     basic_syncbuf()
       : basic_syncbuf(nullptr) {}
     explicit basic_syncbuf(streambuf_type* obuf = nullptr)
       : basic_syncbuf(obuf, Allocator()) {}
     […]
   };