[#BloombergLP-bdlsb-OverflowMemOutStreamBuf-xsputn]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlsb.adoc[bdlsb]::xref:BloombergLP/bdlsb/OverflowMemOutStreamBuf.adoc[OverflowMemOutStreamBuf]::xsputn
:relfileprefix: ../../../
:mrdocs:

Write characters from a buffer into this stream buffer.

== Synopsis

Declared in `<bdlsb_overflowmemoutstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
std::streamsize
xsputn(
    char_type const* source,
    std::streamsize numChars) override;
----

== Description

Write the specified `numChars` characters from the specified `source` to the stream buffer. Return the number of characters successfully written. The behavior is undefined unless `(source && 0 < numChars) || 0 == numChars`.

== Return Value

number of characters successfully written

== Parameters

[cols="1,4"]
|===
| Name| Description
| *source*
| buffer of characters to write
| *numChars*
| number of characters to write
|===


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