mirrors/prosody
1
0
Fork 0
mirror of https://github.com/bjc/prosody.git synced 2025-04-04 13:47:41 +03:00
Code Issues Projects Releases Packages Wiki Activity Actions

util.set: Add is_set() to test if an object is a set

Browse source
This commit is contained in:
Matthew Wild 2021-05-10 16:41:56 +01:00
parent f5460a5037
commit 06161ab766
1 changed files with 8 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

10
util/set.lua
View file

@ -6,8 +6,8 @@
-- COPYING file in the source package for more information. -- COPYING file in the source package for more information.
-- --
local ipairs, pairs, setmetatable, next, tostring = local ipairs, pairs, getmetatable, setmetatable, next, tostring =
ipairs, pairs, setmetatable, next, tostring; ipairs, pairs, getmetatable, setmetatable, next, tostring;
local t_concat = table.concat; local t_concat = table.concat;
local _ENV = nil; local _ENV = nil;
@ -31,6 +31,11 @@ function set_mt:__freeze()
return a; return a;
end end
local function is_set(o)
local mt = getmetatable(o);
return mt == set_mt;
end
local function new(list) local function new(list)
local items = setmetatable({}, items_mt); local items = setmetatable({}, items_mt);
local set = { _items = items }; local set = { _items = items };
@ -171,6 +176,7 @@ end
return { return {
new = new; new = new;
is_set = is_set;
union = union; union = union;
difference = difference; difference = difference;
intersection = intersection; intersection = intersection;