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| author | Sverker Eriksson <[email protected]> | 2014-03-12 20:11:10 +0100 |
|---|---|---|
| committer | Sverker Eriksson <[email protected]> | 2014-03-14 15:08:23 +0100 |
| commit | c543d5bff7fb23c3f44cc4817c0654117de78919 (patch) | |
| tree | 2ef05bcb7ea4a167b69a2938009fe25a137cc6aa /erts/doc | |
| parent | 8fbe76d64e7d55eb41943484602b928658313a65 (diff) | |
| download | otp-c543d5bff7fb23c3f44cc4817c0654117de78919.tar.gz otp-c543d5bff7fb23c3f44cc4817c0654117de78919.tar.bz2 otp-c543d5bff7fb23c3f44cc4817c0654117de78919.zip | |
erts: Change external format for maps
to be: 116,Arity, K1,V1,K2,V2,...,Kn,Vn
instead of: 116,Arity, K1,K2,...,Kn, V1,V2,....,Vn
We think this will be better for future internal map structures
like HAMT. Would be bad if we need to iterate twice over HAMT
in term_to_binary, one for keys and one for values.
Diffstat (limited to 'erts/doc')
| -rw-r--r-- | erts/doc/src/erl_ext_dist.xml | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/erts/doc/src/erl_ext_dist.xml b/erts/doc/src/erl_ext_dist.xml index 9a53f3f829..fa083db4c7 100644 --- a/erts/doc/src/erl_ext_dist.xml +++ b/erts/doc/src/erl_ext_dist.xml @@ -581,23 +581,20 @@ <cell align="center">1</cell> <cell align="center">4</cell> <cell align="center">N</cell> - <cell align="center">M</cell> </row> <row> <cell align="center">116</cell> <cell align="center">Arity</cell> - <cell align="center">Keys</cell> - <cell align="center">Values</cell> + <cell align="center">Pairs</cell> </row> <tcaption></tcaption></table> <p> <c>MAP_EXT</c> encodes a map. The <c>Arity</c> field is an unsigned 4 byte integer in big endian format that determines the number of - key-value pairs in the map. All key terms follow in the <c>Keys</c> - section and then all value terms in the <c>Values</c> section. Keys - and values are paired according to order; first key with first value - and so on. Duplicate keys are <em>not allowed</em> within the same - map. + key-value pairs in the map. Key and value pairs (<c>Ki => Vi</c>) + are encoded in the <c>Pairs</c> section in the following order: + <c>K1, V1, K2, V2,..., Kn, Vn</c>. + Duplicate keys are <em>not allowed</em> within the same map. </p> <p><em>Since: </em>OTP 17.0</p> </section> |