diff options
Diffstat (limited to 'erts/doc/src/notes.xml')
| -rw-r--r-- | erts/doc/src/notes.xml | 49 |
1 files changed, 28 insertions, 21 deletions
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index 3f6d5b1d89..f27e73b9d3 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2004</year><year>2013</year> + <year>2004</year><year>2015</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -708,19 +708,20 @@ </item> <item> <p> - Use persistent hashmaps for large Maps <p>Maps will use a + Use persistent hashmaps for large Maps</p> + <p>Maps will use a persistent hashmap implementation when the number of pairs in a Map becomes sufficiently large. The change will occur when a Map reaches 33 pairs in size but this - limit might change in the future.</p></p> - <p>The most significant impact for the user by this + limit might change in the future.</p> + <p>The most significant impact for the user by this change is speed, and to a lesser degree memory consumption and introspection of Maps. Memory consumption size is probalistic but lesser than <c>gb_trees</c> or <c>dict</c> for instance. Any other impacts will be transparent for the user except for the following changes.</p> - <p>Semantics of Maps have changed in two incompatible + <p>Semantics of Maps have changed in two incompatible ways compared to the experimental implementation in OTP 17:</p> <list> <item>Hashing of maps is done different by <c>erlang:phash2/1,2</c>, <c>erlang:phash/1</c> and @@ -1368,7 +1369,7 @@ <p> Improved support for atomic memory operations provided by the <url - href="https://github.com/ivmai/libatomic_ops/"><c>libatomic_ops</c></url> + href="https://github.com/ivmai/libatomic_ops/">libatomic_ops</url> library. Most importantly support for use of native double word atomics when implemented by <c>libatomic_ops</c> (for example, implemented for ARM).</p> @@ -2335,22 +2336,28 @@ <p> EEP43: New data type - Maps</p> <p> - With Maps you may for instance: <taglist> <item><c>M0 = - #{ a => 1, b => 2}, % create - associations</c></item> <item><c>M1 = M0#{ a := 10 }, % - update values</c></item> <item><c>M2 = M1#{ "hi" => - "hello"}, % add new associations</c></item> <item><c>#{ - "hi" := V1, a := V2, b := V3} = M2. % match keys with - values</c></item> </taglist></p> + With Maps you may for instance:</p> + <taglist> + <tag/> <item><c>M0 = #{ a => 1, b => 2}, % create + associations</c></item> + <tag/><item><c>M1 = M0#{ a := 10 }, % update values</c></item> + <tag/><item><c>M2 = M1#{ "hi" => + "hello"}, % add new associations</c></item> + <tag/><item><c>#{ "hi" := V1, a := V2, b := V3} = M2. + % match keys with values</c></item> + </taglist> <p> For information on how to use Maps please see Map Expressions in the <seealso marker="doc/reference_manual:expressions#map_expressions"> Reference Manual</seealso>.</p> <p> The current implementation is without the following - features: <taglist> <item>No variable keys</item> - <item>No single value access</item> <item>No map - comprehensions</item> </taglist></p> + features:</p> + <taglist> + <tag/><item>No variable keys</item> + <tag/><item>No single value access</item> + <tag/><item>No map comprehensions</item> + </taglist> <p> Note that Maps is <em>experimental</em> during OTP 17.0.</p> <p> @@ -4510,8 +4517,7 @@ <p> Fix erl_prim_loader errors in handling of primary archive. The following errors have been corrected:</p> - <p> - <list> <item> If primary archive was named "xxx", then a + <list> <item> If primary archive was named "xxx", then a file in the same directory named "xxxyyy" would be interpreted as a file named "yyy" inside the archive. </item> <item> erl_prim_loader did not correctly create @@ -4526,7 +4532,8 @@ erl_prim_loader:list_dir/1 would sometimes return an empty string inside the file list. This was a virtual element representing the top directory of the archive. - This has been removed. </item> </list></p> + This has been removed. </item> + </list> <p> Thanks to Tuncer Ayaz and Shunichi Shinohara for reporting and co-authoring corrections.</p> @@ -6969,12 +6976,12 @@ Own Id: OTP-8726 Aux Id: seq11617 </p> </item> <item> - <p>Fix libm linking with --as-needed flag + <p>Fix libm linking with --as-needed flag</p> <p> When building with "--as-needed" linker flags on Linux the build will fail. This has now been fixed.</p> <p> - (Thanks to Christian Faulhammer)</p></p> + (Thanks to Christian Faulhammer)</p> <p> Own Id: OTP-8728</p> </item> |