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--- lam.util
local m = {}
function m.pop (tbl)
--[[ Remove the first element from TBL. ]]
return table.remove(tbl, 1)
end
function m.proc (arity, fn)
--[[ Wrap RN in a check that for its ARITY.
ARITY can be a number, the minimum number of arguments,
or a table {MIN, MAX}. If MIN is nil or absent, it's 0;
if MAX is nil or absent, it's infinity. MIN and MAX are
both inclusive.
]]
local rmin, rmax, rstr
if type(arity) ~= "table" then
rmin, rmax = arity, arity
rstr = rmin
else
rmin, rmax = arity[1] or 0, arity[2] or 1/0 -- infinity
rstr = rmin .. ".." .. rmax
end
return function (r)
local rlen = r and #r or 0
if rlen < rmin or rlen > rmax then
error(string.format("Wrong arity: %s, need %s",
rlen,
rstr))
end
return fn(r)
end
end
---
return m
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