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authorGuilherme Andrade <[email protected]>2017-02-25 22:00:17 +0000
committerGuilherme Andrade <[email protected]>2017-03-22 23:57:54 +0000
commited71ea35bad9a511125c82ce42160cad9fa8311f (patch)
tree26e1d5a3e58246f7b44c193b8d1441e278ac63c8 /lib/stdlib/doc/src
parent36d93952f6ca64192f05e0482fa55270103c8d97 (diff)
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Reject unsafe matchspecs on ets:select_replace/2
Preemptively fail operation with badarg if the replacement object might have a different key.
Diffstat (limited to 'lib/stdlib/doc/src')
-rw-r--r--lib/stdlib/doc/src/ets.xml20
1 files changed, 8 insertions, 12 deletions
diff --git a/lib/stdlib/doc/src/ets.xml b/lib/stdlib/doc/src/ets.xml
index 3e9ad89b26..29d22ffae5 100644
--- a/lib/stdlib/doc/src/ets.xml
+++ b/lib/stdlib/doc/src/ets.xml
@@ -1492,25 +1492,21 @@ is_integer(X), is_integer(Y), X + Y < 4711]]></code>
<func>
<name name="select_replace" arity="2"/>
- <fsummary>Match the objects in an ETS table against a match_spec and
- replaces matching objects with the match_spec result</fsummary>
+ <fsummary>Match and replace objects atomically in an ETS table</fsummary>
<desc>
<warning>
<p>For the moment, due to performance and semantic constraints,
tables of type <c>bag</c> are not yet supported.</p>
</warning>
<p>Matches the objects in the table <c><anno>Tab</anno></c> using a
- <seealso marker="#match_spec">match_spec</seealso>. If the
- an object is matched, and the match_spec result is an object with the
- same key, the existing object is replaced with the match_spec result.
- For any other result from the match_spec the object is kept
- unchanged.</p>
- <p>The function returns the number of objects actually
- replaced in the table.</p>
+ <seealso marker="#match_spec">match specification</seealso>. If the
+ an object is matched, the existing object is replaced with
+ the match specificatoin result.</p>
+ <p>The function returns the total number of replaced objects.</p>
<note>
- <p>The <c>match_spec</c> has to return an object with the same key if
- the object is to be replaced. No other return value will get the
- object replaced.</p>
+ <p>If there's a risk a match specification might return
+ a tuple with a different key, the whole operation will fail
+ with <c>badarg</c>.</p>
</note>
</desc>
</func>