Re: Associative tuples
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- Subject: Re: Associative tuples
- From: dyngeccetor8 <dyngeccetor8@...>
- Date: 2018年1月13日 01:33:06 +0300
On 01/11/2018 01:09 AM, Gavin Wraith wrote:
> [...]
> we have
> tuple (1,2,3) == tuple (1, tuple (2,3)) --> true
> by definition but, alas,
> tuple (1,2,3) == tuple (tuple (1,2), 3) --> false
> So are there any associative tupling functions?
> [...]> --
> Gavin Wraith (gavin@wra1th.plus.com)
> Home page: http://www.wra1th.plus.com/
Why not implement tuples via lists?
tuple =
function(...)
local result = {type = 'tuple'}
local process
process =
function(list)
for i, el in ipairs(list) do
if (type(el) == 'table') and (el.type == 'tuple') then
process(el)
else
table.insert(result, el)
end
end
end
process({...})
return result
end
is_equal =
function(t_a, t_b)
if (#t_a == #t_b) then
for i = 1, #t_a do
if (t_a[i] ~= t_b[i]) then
return false
end
end
return true
else
return false
end
end
-- Verification:
print(
'true',
is_equal(
tuple(1, tuple(2, 3)),
tuple(tuple(1, 2), 3)
),
is_equal(
tuple(1, tuple(2, 3)),
tuple(1, 2, 3)
),
is_equal(
tuple(1, 2, 3),
tuple(tuple(1, 2, 3))
)
)
print(
'false',
is_equal(
tuple(1, 2, 3),
tuple(1, 2)
),
is_equal(
tuple(1, tuple(2, 3)),
tuple(1, tuple(2))
)
)
-- Martin