Gammon Forum
Entire forum
MUSHclient
Lua
Having trouble with variable number of arguments
Having trouble with variable number of arguments
|
It is now over 60 days since the last post. This thread is closed.
  Refresh page
Pages: 1
2
Posted by
| Nick Gammon
Australia (22,973 posts) bio
Forum Administrator |
Date
| Reply #15 on Thu 11 Sep 2008 09:31 PM (UTC) |
Message
|
Quote:
c = { [xxx] = "a" } -- assigns "a" to c.q
d = { "xxx" = "a" } -- error: '}' expected near '='
I'd expect the last table to work and have (d.xxx == "a") as a result. Why is -that- assignment not supported?
I think the answer would be, it would be ambiguous.
On the face of it, it would seem reasonable to support stuff like:
t = {
"a" = 22, -- t ["a"] = 22
45 = 68, -- t [45] = 68
true = 99, -- t [true] = 99
2 + 2 = 55, -- t [4] = 55
}
Effectively by allowing any sort of constant there. However then you would expect any expression there too (like in the case of 2 + 2).
Now you hit a big problem:
foo = 42
t = {
foo = 99, -- t [42] = 99
}
The entry "foo" is an expression, which happens to be a variable containing 42. However we are already used to that actually meaning:
foo = 42
t = {
foo = 99, -- t ["foo"] = 99
}
So, exceptions would have to be made, to be consistent with what currently happens. The whole thing would probably become a mess. |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | top |
|
Posted by
| Worstje
Netherlands (899 posts) bio
|
Date
| Reply #16 on Thu 11 Sep 2008 11:04 PM (UTC) |
Message
| Good reason, I am satisfied. ^_^
(Although I still say it's the wrong way around.. dum dum.) | top |
|
Posted by
| David Haley
USA (3,881 posts) bio
|
Date
| Reply #17 on Thu 11 Sep 2008 11:33 PM (UTC) |
Message
| Well, you wouldn't have to allow arbitrary expressions -- you could stick with identifiers and string literals only. Of course, then you have an inconsistency of sorts of only allowing string constants. |
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone
http://david.the-haleys.org | top |
|
The dates and times for posts above are shown in Universal Co-ordinated Time (UTC).
To show them in your local time you can join the forum, and then set the 'time correction' field in your profile to the number of hours difference between your location and UTC time.
40,649 views.
This is page 2, subject is 2 pages long:
1
2
It is now over 60 days since the last post. This thread is closed.
  Refresh page
top
Quick links:
MUSHclient.
MUSHclient help.
Forum shortcuts.
Posting templates.
Lua modules.
Lua documentation.
Information and images on this site are licensed under the Creative Commons Attribution 3.0 Australia License unless stated otherwise.