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| author | Michał Muskała <[email protected]> | 2018-07-17 18:38:10 +0200 |
|---|---|---|
| committer | Michał Muskała <[email protected]> | 2018-07-17 19:30:49 +0200 |
| commit | 0916c5c6e536affca1f6f0c7693d68fb64843c1c (patch) | |
| tree | 1323d1656dc8770e8b9e24f997e323f77720022e /lib | |
| parent | 0e9c319480d9cfb778b654bf2cd71e7bd31464f9 (diff) | |
| download | otp-0916c5c6e536affca1f6f0c7693d68fb64843c1c.tar.gz otp-0916c5c6e536affca1f6f0c7693d68fb64843c1c.tar.bz2 otp-0916c5c6e536affca1f6f0c7693d68fb64843c1c.zip | |
maps:new/0 is no longer a BIF
Implementing it in Erlang allows taking advantage of the literal pool
optimisation, this means the function implemented in Erlang does no
allocations, while the BIF had to allocate new map each time it was
called. Benchmarks show the function is also slightly faster now.
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/stdlib/src/maps.erl | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/lib/stdlib/src/maps.erl b/lib/stdlib/src/maps.erl index 60463feec2..6f5553c769 100644 --- a/lib/stdlib/src/maps.erl +++ b/lib/stdlib/src/maps.erl @@ -21,7 +21,7 @@ -module(maps). -export([get/3, filter/2,fold/3, - map/2, size/1, + map/2, size/1, new/0, update_with/3, update_with/4, without/2, with/2, iterator/1, next/1]). @@ -29,7 +29,7 @@ %% BIFs -export([get/2, find/2, from_list/1, is_key/2, keys/1, merge/2, - new/0, put/3, remove/2, take/2, + put/3, remove/2, take/2, to_list/1, update/3, values/1]). -opaque iterator() :: {term(), term(), iterator()} @@ -91,13 +91,6 @@ keys(_) -> erlang:nif_error(undef). merge(_,_) -> erlang:nif_error(undef). - --spec new() -> Map when - Map :: map(). - -new() -> erlang:nif_error(undef). - - %% Shadowed by erl_bif_types: maps:put/3 -spec put(Key,Value,Map1) -> Map2 when Key :: term(), @@ -157,6 +150,11 @@ values(_) -> erlang:nif_error(undef). %% End of BIFs +-spec new() -> Map when + Map :: #{}. + +new() -> #{}. + -spec update_with(Key,Fun,Map1) -> Map2 when Key :: term(), Map1 :: map(), |