[#BloombergLP-bslstl-HashTable-09-2constructor-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/HashTable-09.adoc[HashTable<UnorderedMapKeyConfiguration<basic_string<char> const, pair<basic_string<char> const, Json>>, TransparentHash, TransparentEqualTo, allocator<pair<basic_string<char> const, Json>>>]::HashTable
:relfileprefix: ../../../
:mrdocs:

Create an empty hash‐table using the specified `hash` and `compare` functors to organize elements in the table, which will initially have at least the specified `initialNumBuckets` and a `maxLoadFactor` of the specified `initialMaxLoadFactor`. Optionally specify a `basicAllocator` used to supply memory. If `basicAllocator` is not supplied, a default‐constructed object of the (template parameter) type `ALLOCATOR` is used. If the type `ALLOCATOR` is `bsl::allocator` and `basicAllocator` is not supplied, the currently installed default allocator is used to supply memory. If this constructor tries to allocate a number of buckets larger than can be represented by this hash‐table's `SizeType`, a `std::length_error` exception is thrown. The behavior is undefined unless `0 < initialMaxLoadFactor`. Note that more than `initialNumBuckets` buckets may be created in order to preserve the bucket allocation strategy of the hash‐table (but never fewer). Also note that a `bslma::Allocator *` can be supplied for `basicAllocator` if the type `ALLOCATOR` is `bsl::allocator` (the default).

== Synopsis

Declared in `<bslstl_hashtable.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
HashTable(
    xref:BloombergLP/bdlb/TransparentHash.adoc[TransparentHash] const& hash,
    xref:BloombergLP/bdlb/TransparentEqualTo.adoc[TransparentEqualTo] const& compare,
    xref:BloombergLP/bslstl/HashTable-09/SizeType.adoc[SizeType] initialNumBuckets,
    float initialMaxLoadFactor,
    xref:bsl/allocator-0df.adoc[allocator<pair<basic_string<char> const, Json>>] const& basicAllocator = ALLOCATOR());
----


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