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

Unextracting a single character.

== Synopsis

Declared in `<bslstl_istringstream.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
__istream_type&
putback(char_type __c);
----

== Description

If `rdbuf()` is not null, calls `rdbuf()‐>sputbackc(c).`

If `rdbuf()` is null or if `sputbackc()` fails, sets badbit in the error state.

[NOTE]
====
This function first clears eofbit. Since no characters are extracted, the next call to `gcount()` will return 0, as required by DR 60.

====

== Return Value

*this

== Parameters

[cols="1,4"]
|===
| Name| Description
| *__c*
| The character to push back into the input stream.
|===


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