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

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

Priority:0

View all otherissues in [syncstream.syncbuf.overview].

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Discussion:

WhenP0935 "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 toN4830.

1. Modify 31.11.2.1[syncstream.syncbuf.overview], class templatebasic_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 destructionbasic_syncbuf()    : basic_syncbuf(nullptr) {}  explicit basic_syncbuf(streambuf_type* obuf= nullptr)    : basic_syncbuf(obuf, Allocator()) {}  […]};