Return an iterator providing modifiable access to the first value_type object (in the sequence of value_type objects) maintained by this unordered multimap, or the end iterator if this unordered multimap is empty.
Synopsis
Declared in <bslstl_unorderedmultimap.h>
unordered_multimap<KEY, VALUE, HASH, EQUAL, ALLOCATOR>::iterator
begin() noexcept;
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