[#BloombergLP-balb-RateLimiter-reserve]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balb.adoc[balb]::xref:BloombergLP/balb/RateLimiter.adoc[RateLimiter]::reserve
:relfileprefix: ../../../
:mrdocs:

Reserve the specified `numUnits` for future use by this rate limiter. The behavior is undefined unless the sum of `numUnits`, unused units previously submitted to this rate limiter, and `unitsReserved` can be represented by a 64‐bit unsigned integral type.

== Synopsis

Declared in `<balb_ratelimiter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
reserve(xref:BloombergLP/bsls/Types/Uint64.adoc[bsls::Types::Uint64] numUnits);
----


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