[#bsl-basic_osyncstream-rdbuf]
= xref:bsl.adoc[bsl]::xref:bsl/basic_osyncstream.adoc[basic_osyncstream]::rdbuf
:relfileprefix: ../../
:mrdocs:

Return an address providing modifiable access to the `basic_syncbuf` object that is internally used by this stream object to buffer unformatted characters.

== Synopsis

Declared in `<bslstl_osyncstream.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_osyncstream/syncbuf_type.adoc[basic_osyncstream<CHAR, TRAITS, ALLOCATOR>::syncbuf_type]*
rdbuf() const noexcept;
----


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