lua-users home
lua-l archive

[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index] [Thread Index]

Am 20.12.18 um 12:55 schröbte Andrew Gierth:
"Gabriel" == Gabriel Bertilson <> writes:

  Gabriel> Then the closure receives an unused first argument and a
  Gabriel> second argument i, and it returns the i-plus-one-th argument
  Gabriel> to the original function (similar to the behavior of the
  Gabriel> function returned by ipairs). Not sure if this is more or less
  Gabriel> efficient memory-wise than using a table.

I don't see any obvious reason why it would be more efficient - creating
the closure is allocating an object, after all, and it seems that
closures with upvalues probably would be more overhead than tables. But
I've not tried it.

The table version is 40 bytes more expensive on x86_64 (probably a bit more because there are two allocations for the table version and just one for the C closure).