Return an iterator to the first element.
Synopsis
Declared in <bslstl_unorderedmap.h>
iterator
begin() noexcept;Description
Return an iterator providing modifiable access to the first value_type object in the sequence of value_type objects maintained by this unordered map, or the end iterator if this unordered map is empty.
Return Value
iterator to the first element, or end() if empty
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