Re: std::map without sorted iteration

Barry <>
Thu, 29 May 2008 10:50:55 +0800
Pete Becker wrote:

On 2008-05-27 21:23:10 -0400, Barry <> said: wrote:

Is there something that is like an std::map (unique key -> value, fast
lookup, insert, and erase), but iterating through the elements goes in
the order you added them in, rather than sorted by key? I don't need
fast lookup of an element given an index, it only matters that the
elements are not reordered.

Sounds like hash table is your need.
in C++, tr1::unordered_map

unordered_map does not guarantee that iteration order is the same as
insertion order.

I was aware of this, I thought the OP just wanted to avoid sorting to
improve performance ;-)

guaranteeing the iteration order practically needs to borrow extra
storage to maintain the insertion order, like LinkedHashMap in Java,
which uses double-linked list.

in other post, someone suggested Boost.MultiIndex, maybe adding an auto
incremented integral key to maintain the insertion order like the
database auto id.

Best Regards

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