[#BloombergLP-bdlsb-FixedMemInStreamBuf-xsgetn]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlsb.adoc[bdlsb]::xref:BloombergLP/bdlsb/FixedMemInStreamBuf.adoc[FixedMemInStreamBuf]::xsgetn
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Read the specified `length` number of characters into the specified `destination`&period; Return the number of characters successfully read&period; The behavior is undefined unless `0 &lt;&equals; length`&period;

== Synopsis

Declared in `&lt;bdlsb&lowbar;fixedmeminstreambuf&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
std::streamsize
xsgetn(
    char&lowbar;type* destination,
    std::streamsize length) override;
----


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