[#BloombergLP-bdlsb-MemOutStreamBuf-reserveCapacity]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlsb.adoc[bdlsb]::xref:BloombergLP/bdlsb/MemOutStreamBuf.adoc[MemOutStreamBuf]::reserveCapacity
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Reserve sufficient internal capacity to store at least the specified `numCharacters` characters without reallocation. Note that if the storage size specified is less than the number of characters already in the buffer, this method has no effect.

== Synopsis

Declared in `<bdlsb_memoutstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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void
reserveCapacity(std::size_t numCharacters);
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