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cppdraft/spanbuf/members.md

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+[spanbuf.members]
+
+# 31 Input/output library [[input.output]](./#input.output)
+
+## 31.9 Span-based streams [[span.streams]](span.streams#spanbuf.members)
+
+### 31.9.3 Class template basic_spanbuf [[spanbuf]](spanbuf#members)
+
+#### 31.9.3.4 Member functions [spanbuf.members]
+
+[🔗](#lib:span,basic_spanbuf)
+
+`std::span<charT> span() const noexcept;
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L10244)
+
+*Returns*: If ios_base​::​out is set in *mode*,
+returns std​::​span<charT>(pbase(), pptr()),
+otherwise returns *buf*[.](#1.sentence-1)
+
+[*Note [1](#note-1)*:
+
+In contrast to basic_stringbuf,
+the underlying sequence never grows and is not owned[.](#1.sentence-2)
+
+An owning copy can be obtained
+by converting the result to basic_string<charT>[.](#1.sentence-3)
+
+— *end note*]
+
+[🔗](#lib:span,basic_spanbuf_)
+
+`void span(std::span<charT> s) noexcept;
+`
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L10264)
+
+*Effects*: *buf* = s[.](#2.sentence-1)
+
+Initializes the input and output sequences according to *mode*[.](#2.sentence-2)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L10269)
+
+*Postconditions*: 
+
+- [(3.1)](#3.1)
+
+  If ios_base​::​out is set in *mode*,pbase() == s.data() && epptr() == pbase() + s.size() is true;
+  * [(3.1.1)](#3.1.1)
+
+in addition, if ios_base​::​ate is set in *mode*,pptr() == pbase() + s.size() is true,
+
+  * [(3.1.2)](#3.1.2)
+
+otherwise pptr() == pbase() is true[.](#3.1.sentence-1)
+
+- [(3.2)](#3.2)
+
+  If ios_base​::​in is set in *mode*,eback() == s.data() && gptr() == eback() && egptr() == eback() + s.size() is true[.](#3.2.sentence-1)