On Tue, Apr 3, 2018 at 7:27 AM, Soni "They/Them" L. <fakedme@gmail.com> wrote:
What about 'rawlen' and the C function 'lua_rawlen'? They ignore the __len metamethod.
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Gé
What about a table.border that respects __index?
There are two ways to look at a table in Lua:
- through the usual array index operations, and through the length operator, which allows you to override standard behaviors.
- through the 'raw...' set of functions which don't.
There's nothing stopping anyone from implementing 'border' in C or Lua, so I don't see the point of adding random permutations of raw and 'cooked' access to tables.
Your table.border that respects __index looks something like this:
local function border(t)
local hi = 1
while t[hi] ~= nil do
hi = hi * 2
end
-- invariant: (lo == 0 or t[lo] ~= nil) and t[hi] == nil
