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cppdraft/span/streams/overview.md

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+[span.streams.overview]
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+# 31 Input/output library [[input.output]](./#input.output)
+
+## 31.9 Span-based streams [[span.streams]](span.streams#overview)
+
+### 31.9.1 Overview [span.streams.overview]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L10001)
+
+The header <spanstream> defines class templates and types
+that associate stream buffers with objects whose types are
+specializations of span as described in [[views.span]](views.span "23.7.2.2 Class template span")[.](#1.sentence-1)
+
+[*Note [1](#note-1)*:
+
+A user of these classes is responsible for ensuring
+that the character sequence represented by the given span outlives the use of the sequence by objects of the classes in [[span.streams]](span.streams "31.9 Span-based streams")[.](#1.sentence-2)
+
+Using multiple basic_spanbuf objects
+referring to overlapping underlying sequences from different threads,
+where at least one basic_spanbuf object is used
+for writing to the sequence,
+results in a data race[.](#1.sentence-3)
+
+— *end note*]