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| author | Guilherme Andrade <[email protected]> | 2017-02-25 22:00:17 +0000 |
|---|---|---|
| committer | Guilherme Andrade <[email protected]> | 2017-03-22 23:57:54 +0000 |
| commit | ed71ea35bad9a511125c82ce42160cad9fa8311f (patch) | |
| tree | 26e1d5a3e58246f7b44c193b8d1441e278ac63c8 /lib/stdlib/doc | |
| parent | 36d93952f6ca64192f05e0482fa55270103c8d97 (diff) | |
| download | otp-ed71ea35bad9a511125c82ce42160cad9fa8311f.tar.gz otp-ed71ea35bad9a511125c82ce42160cad9fa8311f.tar.bz2 otp-ed71ea35bad9a511125c82ce42160cad9fa8311f.zip | |
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')
| -rw-r--r-- | lib/stdlib/doc/src/ets.xml | 20 |
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> |