Return a const iterator to the first element, or cend if empty.
Declared in <bslstl_unorderedmultimap.h>
unordered_multimap<KEY, VALUE, HASH, EQUAL, ALLOCATOR>::const_iterator
cbegin() const noexcept;Return an iterator providing non-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.
const iterator to the first element, or cend() if empty