[#bsl-basic_istringstream-sentry]
= xref:bsl.adoc[bsl]::xref:bsl/basic_istringstream.adoc[basic_istringstream]::sentry
:relfileprefix: ../../
:mrdocs:

Performs setup work for input streams.

== Synopsis

Declared in `<bslstl_istringstream.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class sentry;
----

== Description

Objects of this class are created before all of the standard extractors are run. It is responsible for _exception‐safe prefix and suffix operations,_ although only prefix actions are currently required by the standard.


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