Re: Proper Tail Calls Lua 5.2
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- Subject: Re: Proper Tail Calls Lua 5.2
- From: Lorenzo Donati <lorenzodonatibz@...>
- Date: 2016年2月14日 12:46:52 +0100
On 13/02/2016 02:38, Derek Bailey wrote:
[snip]
Would the following statements fit that form or not?
[snip]
return func(tbl[nextKey]), _map(func, nextKey, tbl)
According to manual [1], no, this is not a case of tail call. Quoting
that part (emphasis mine):
<quote>
A call of the form return functioncall is called a tail call.
[snip]
Note that **a tail call only happens with a particular syntax**, where
the return has **one single function call** as argument;
[snip]
</quote>
And this is confirmed looking at the VM disassembled code, as Dirk
showed in another message.
Cheers!
-- Lorenzo
[1] http://www.lua.org/manual/5.3/manual.html#3.4.10