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| author | Guilherme Andrade <[email protected]> | 2016-06-03 00:39:01 +0100 |
|---|---|---|
| committer | Guilherme Andrade <[email protected]> | 2017-03-22 23:04:35 +0000 |
| commit | 5b7e50500f6cb3e680b277f871392ac706c5c1d7 (patch) | |
| tree | afe3cfb1d0695c1e48465269fbece8e16cb4a684 /lib | |
| parent | c5e09d9315044bb9ac27702f6a9d3c6f290a3b8e (diff) | |
| download | otp-5b7e50500f6cb3e680b277f871392ac706c5c1d7.tar.gz otp-5b7e50500f6cb3e680b277f871392ac706c5c1d7.tar.bz2 otp-5b7e50500f6cb3e680b277f871392ac706c5c1d7.zip | |
ETS: Allow for matchspec-based replacement
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/stdlib/doc/src/ets.xml | 21 | ||||
| -rw-r--r-- | lib/stdlib/src/ets.erl | 10 |
2 files changed, 30 insertions, 1 deletions
diff --git a/lib/stdlib/doc/src/ets.xml b/lib/stdlib/doc/src/ets.xml index 05401a2d40..36c803b40c 100644 --- a/lib/stdlib/doc/src/ets.xml +++ b/lib/stdlib/doc/src/ets.xml @@ -1491,6 +1491,27 @@ is_integer(X), is_integer(Y), X + Y < 4711]]></code> </func> <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> + <desc> + <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> + <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> + </note> + </desc> + </func> + + <func> <name name="select_reverse" arity="1"/> <fsummary>Continue matching objects in an ETS table.</fsummary> <desc> diff --git a/lib/stdlib/src/ets.erl b/lib/stdlib/src/ets.erl index 90e19e6b9f..195a407570 100644 --- a/lib/stdlib/src/ets.erl +++ b/lib/stdlib/src/ets.erl @@ -70,7 +70,7 @@ match_object/2, match_object/3, match_spec_compile/1, match_spec_run_r/3, member/2, new/2, next/2, prev/2, rename/2, safe_fixtable/2, select/1, select/2, select/3, - select_count/2, select_delete/2, select_reverse/1, + select_count/2, select_delete/2, select_replace/2, select_reverse/1, select_reverse/2, select_reverse/3, setopts/2, slot/2, take/2, update_counter/3, update_counter/4, update_element/3]). @@ -379,6 +379,14 @@ select_count(_, _) -> select_delete(_, _) -> erlang:nif_error(undef). +-spec select_replace(Tab, MatchSpec) -> NumReplaced when + Tab :: tab(), + MatchSpec :: match_spec(), + NumReplaced :: non_neg_integer(). + +select_replace(_, _) -> + erlang:nif_error(undef). + -spec select_reverse(Tab, MatchSpec) -> [Match] when Tab :: tab(), MatchSpec :: match_spec(), |