This means that a
multimap
supports the
a_eq
operations in
[associative.reqmts]
but not the
a_uniq
operations
. For a
multimap<Key,T>
the
key_type
is
Key
and the
value_type
is
pair<const Key,T>. Descriptions are provided here only for operations on
multimap
that are not described in one of those tables
or for operations where there is additional semantic information
.