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

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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
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10
util/set.lua
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@ -6,8 +6,8 @@
-- COPYING file in the source package for more information.
--
local ipairs, pairs, setmetatable, next, tostring =
ipairs, pairs, setmetatable, next, tostring;
local ipairs, pairs, getmetatable, setmetatable, next, tostring =
ipairs, pairs, getmetatable, setmetatable, next, tostring;
local t_concat = table.concat;
local _ENV = nil;
@ -31,6 +31,11 @@ function set_mt:__freeze()
return a;
end
local function is_set(o)
local mt = getmetatable(o);
return mt == set_mt;
end
local function new(list)
local items = setmetatable({}, items_mt);
local set = { _items = items };
@ -171,6 +176,7 @@ end
return {
new = new;
is_set = is_set;
union = union;
difference = difference;
intersection = intersection;