mixintemplate OrderedIndex(size_t N, bool allowDuplicates, alias KeyFromValue, alias Compare, ThisContainer)
size_t
insert
 if (
isInputRange!Stuff && 
isImplicitlyConvertible!(
ElementType!
Stuff, 
Elem)
 )
 out (r)
{
    
version (RBDoChecks)
        _Check();
}
Insert a range of elements in the container. Note that this does not invalidate any ranges currently iterating the container.
Complexity: O(n stuff * i(n));
O(n stuff * log(n)) for this index