[#BloombergLP-bdlsb-MemOutStreamBuf-overflow]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlsb.adoc[bdlsb]::xref:BloombergLP/bdlsb/MemOutStreamBuf.adoc[MemOutStreamBuf]::overflow
:relfileprefix: ../../../
:mrdocs:

Append a character to this stream buffer, growing as needed.

== Synopsis

Declared in `<bdlsb_memoutstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
int_type
overflow(int_type insertionChar = bsl::streambuf::traits_type::eof()) override;
----

== Description

Append the optionally specified `insertionChar` to this stream buffer's character buffer and return `insertionChar`. If `insertionChar` is not specified, `traits_type::eof()` is appended instead.

== Return Value

`insertionChar`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *insertionChar*
| character to append, or `eof()` if unspecified
|===


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