Return an iterator to the first entry of this map.
Synopsis
Declared in <bdld_datum.h>
DatumMapRef::const_iterator
cbegin() const noexcept;Description
Return an iterator providing non‐modifiable access to the first element of the array of map entries this reference object represents; return a past‐the‐end iterator if size() == 0.
Return Value
an iterator to the first entry of this map
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