Lua 5.2 custom array demo
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- Subject: Lua 5.2 custom array demo
- From: steve donovan <steve.j.donovan@...>
- Date: Sat, 9 Jan 2010 15:25:32 +0200
It isn't particularly useful, but notice __len and __ipairs;
definitely an advance!
local array = {}
local rawset,rawget,ipairs = rawset,rawget,ipairs
in array do
function __len(t)
return #t.store
end
function __newindex(t,i,val)
rawset(t.store,i,val)
end
function __index(t,i)
return rawget(t.store,i)
end
function __ipairs(t)
return ipairs(t.store)
end
end
function new_array ()
return setmetatable({store={}},array)
end
t = new_array()
t[1] = 10
t[2] = 20
print(#t)
for i,v in ipairs(t) do print(i, v) end
=>
2
1 10
2 20
Of course, any mock-tables have to survive being passed to the table
functions, which traditionally do not cope well ;)
(__ipairs/__pairs is not currently documented)
steve d.