> Currently Set.copyOf allocates both a HashSet and a new empty array when the
> input collection is empty.
>
> This patch avoids allocating anything for the case where the parameter
> collection's isEmpty returns true.
Viktor Klang has updated the pull request incrementally with two additional
commits since the last revision:
- 8299444: java.util.Set.copyOf allocates needlessly for empty input
collections
Modifies ImmutableCollections.listCopy:
Introduces a check for isEmpty to avoid allocation in the case of an
empty input collection.
- 8299444: java.util.Set.copyOf allocates needlessly for empty input
collections
Modifies Map.copyOf:
Introduces a check for isEmpty to avoid allocation in the case of an empty
input Map.
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/11847/files
- new: https://git.openjdk.org/jdk/pull/11847/files/52a87a2b..8e67eb86
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=11847&range=01
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=11847&range=00-01
Stats: 6 lines in 2 files changed: 4 ins; 0 del; 2 mod
Patch: https://git.openjdk.org/jdk/pull/11847.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/11847/head:pull/11847
PR: https://git.openjdk.org/jdk/pull/11847
