Re: [Proposal] Thread Metatable
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- Subject: Re: [Proposal] Thread Metatable
- From: "Soni L." <fakedme@...>
- Date: 2015年6月23日 16:04:05 -0300
On 23/06/15 03:57 PM, Sean Conner wrote:
It was thus said that the Great Soni L. once stated:
On 23/06/15 03:19 PM, Rena wrote:
On Tue, Jun 23, 2015 at 2:11 PM, Soni L. <fakedme@gmail.com> wrote:
On 23/06/15 03:09 PM, Sean Conner wrote:
It was thus said that the Great Luiz Henrique de Figueiredo once stated:
co = coroutine.create(function() print"test" end)
...
Can we get a thread metatable?
debug.setmetatable(co,{__len=function(thread) return "abc" end})
print(#co) --> abc
I think the OP wants
debug.setmetatable(co,{__index=coroutine})
so that he can say co:resume().
Or
debug.setmetatable(
co,
{
__call = function(co,...)
return coroutine.resume(co,...)
end
}
)
so that we can say
co()
-spc
And how do you get the status with that?
Not co:status(), that wouldn't work...
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Disclaimer: these emails are public and can be accessed from <TODO: get a
non-DHCP IP and put it here>. If you do not agree with this, DO NOT REPLY.
By using both __call and __index.
__call and co() makes it look like a function call, which may be kinda
confusing. On the other hand OOP syntax co:resume() is more Lua-like, as
strings have it too. You also cannot index functions.
Yes you can.
function foo(x)
return 3 * x + 5
end
mt =
{
__index = function(obj,idx)
local d = string.dump(obj)
return d:sub(idx,idx)
end
}
debug.setmetatable(foo,mt)
Try it without debug.
print(foo[3])
print(mt.__index[3])
Granted, this is just a proof-of-concept that simply returns back the
bytecode for a function, but it's easy enough to do other things, say,
return upvalues, local variables, parameters, actual instructions (a byte
index of 3 here returns 'u', part of the Lua signature for a dumped
function:
00000000: 1B 4C 75 61 51 00 01 04 08 04 08 00 07 00 00 00 .LuaQ...........
00000010: 00 00 00 00 40 79 2E 6C 75 61 00 04 00 00 00 06 ....@y.lua......
00000020: 00 00 00 00 01 00 02 04 00 00 00 4E 00 00 80 4C ...........N...L
00000030: 40 C0 00 5E 00 00 01 1E 00 80 00 02 00 00 00 03 @..^............
00000040: 00 00 00 00 00 00 08 40 03 00 00 00 00 00 00 14 .......@........
00000050: 40 00 00 00 00 04 00 00 00 05 00 00 00 05 00 00 @...............
00000060: 00 05 00 00 00 06 00 00 00 01 00 00 00 02 00 00 ................
00000070: 00 00 00 00 00 78 00 00 00 00 00 03 00 00 00 00 .....x..........
00000080: 00 00 00 ...
the actual instructions are further in).
-spc (Will do Stupid Lua Tricks for food 8-)
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Disclaimer: these emails are public and can be accessed from <TODO: get a non-DHCP IP and put it here>. If you do not agree with this, DO NOT REPLY.