[#bsl-basic_stringbuf-in_avail]
= xref:bsl.adoc[bsl]::xref:bsl/basic_stringbuf.adoc[basic_stringbuf]::in_avail
:relfileprefix: ../../
:mrdocs:

Looking ahead into the stream.

== Synopsis

Declared in `<bslstl_stringbuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
streamsize
in_avail();
----

== Description

If a read position is available, returns the number of characters available for reading before the buffer must be refilled. Otherwise returns the derived `showmanyc().`

== Return Value

The number of characters available.


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