On 28 June 2016 at 03:29, steve donovan <steve.j.donovan@gmail.com> wrote:
On Tue, Jun 28, 2016 at 8:07 AM, Dirk Laurie <dirk.laurie@gmail.com> wrote:
1. If the __index metamethod exists, use it.
2. If not, use tbl["#"] as the length.
3. If that is nil or false, revert to the built-in algorithm.
Assume that '__len' is meant, not '__index'
Why not simply leave out (2)? Imagine having to explain how #t works
in a future manual.
However, I'm all for table.pack() returning a table which has a
metatable with __len = self.n, and table.unpack() respecting this.
To be honest, this thread made me realize that I always assumed that
table.unpack() was symmetrical to table.pack() (that is, that it
respected .n). This means I most likely have buggy production code out
there that I need to double-check. Shame on me!
-- Hisham
