[#BloombergLP-bdlc-FlatHashSet-reserve]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashSet.adoc[FlatHashSet]::reserve
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Change the capacity of this set to at least a capacity that can accommodate the specified `numEntries` (accounting for the load factor invariant), and redistribute all the contained elements into a new sequence of entries according to their hash values. If `0 == numEntries` and `0 == size()`, the set is returned to the default constructed state. After this call, `load_factor()` will be less than or equal to `max_load_factor()` and all iterators, pointers, and references to elements of this set are invalidated. Note that this method is effectively equivalent to: ` rehash(bsl::ceil(numEntries / max_load_factor())) `

== Synopsis

Declared in `<bdlc_flathashset.h>`

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