1. sequence OF what? - structores
Only thing I can figure you can get out of that is.
Very fixed, non-dynamic typing.
I know, you say, What?
Using OF how would you type handle this?
sequence pb
pb = {"Johnny", "Robert", "Princeton", "Jr.", 12, 31, 1977, 150, "blue",
"blonde", 6, 2, 'M'}
----
I stand by my proposal... or should I say Chris Bensler's proposal of
structures.
Maybe, someone mentioned before him. I wouldn't doubt it. Either way.
Something like this can handle it.
----}}}
<eucode>
type month(object x)
if (integer(x) and (12 >= x and x >=1)) then
return 1
else
return 0
end if
end type
type mday(object x)
if (integer(x) and (31 >= x and x >=1)) then
return 1
else
return 0
end if
end type
type year(object x)
if (integer(x) and (1890 >= x and x >=3000)) then
return 1
else
return 0
end if
end type
type weight(obect x)
if (atom(x) and (2000 >= x and x >=0)) then
return 1
else
return 0
end if
end type
type byte(object x)
if (integer(x) and (255 >= x and x >=0)) then
return 1
else
return 0
end if
end type
type feet(object x)
if (integer(x) and (10 >= x and x >=0)) then
return 1
else
return 0
end if
end type
type inches(object x)
if (integer(x) and (12 >= x and x >=0)) then
return 1
else
return 0
end if
end type
type gender(object x)
if (integer(x) and find(x, "MFUmfu")) then
return 1
else
return 0
end if
end type
-- Hmm, I haven't thought of a way for handling a dynamic length item using
struct
type string(object x)
if (sequence(x)) then
for A = 1 to length(x) do
if (not byte(x[A]) then
return 0
end if
end for
return 1
else
return 0
end if
end type
struct PhoneBookItem
{string, string, string, string, month, mday, year, string, string, feet,
inches, gender}
end struct
</eucode>
{{{
unkmar
-----------------
Complete message by Patrick Barnes is at
http://www.listfilter.com/cgi-bin/esearch.exu?postedBy=Barnes&keywords=myDat
aStructure
----- Original Message -----
From: "Patrick Barnes" <mistertrik at hotmail.com>
To: <EUforum at topica.com>
Sent: Monday, May 31, 2004 7:08 PM
Subject: Re: Stupid Newbie-sounding question.
> We need a new keyword; "of".
> Usage:
>
> type char ( integer c )
> -- return 1 valid character, 0 otherwise
> end type
>
> --myStr is a string
> sequence of char myStr
>
<snip>
>
> If you have a complex data structure list, you could have:
>
> type myDataStructure( sequence s)
> --return 1 if valid myDataStructure, 0 otherwise
> end type
>
> sequence of myDataStructure master_list
>
<snip>
> Multi-dimensional arrays are also possible:
>
> --2d array of integers
> sequence of sequence of integer 2d_array
>
> type textpict_line( sequence s)
> if length(s) = 80 then return 1
> else return 0
> end if
> end type
>
> --2d array where the length of each line is fixed, and consists of
> characters
> sequence of textpict_line of char text_picture
>
>
<snip>>
> type rgb (sequence of integer c)
> return length(c) = 3
> end type
>
> type rgb_map ( sequence of sequence of rgb x)
> return 1
> end type
>
> If no extra checking has to be done, then the type just returns 1.
>
<snip>
> Cheers.
> MrTrick
2. Re: sequence OF what? - structores
http://www.listfilter.com/cgi-bin/esearch.exu?keywords=%22end+struct%22
I Looked back through some of that history of structure suggestions.
type char(object x)
if (integer(x) and (255 >= x and x >= 0) then
result 1
else
result 0
end if
end type
char my_string[]
my_string = "Hello"
my_string = {-1, 45} -- error because -1 isn't a char
stuct Address
street as char[40]
city as char[30]
state as char[2]
zip as char[5]
end struct
OR
stucture Address
street as char(40)
city as char(30)
state as char(2)
zip as char(5)
end structure
Just take a look at the link I supplied.
It shows that this subject as been beat to death before.
And this link displays Rob's view on structures and
some of what we have been asking for.
http://www.listfilter.com/cgi-bin/esearch.exu?postedBy=Craig&keywords=struct
ures
I'll shut up now
unkmar
----- Original Message -----
From: "Patrick Barnes" <mistertrik at hotmail.com>
To: <EUforum at topica.com>
Sent: Thursday, June 03, 2004 10:00 PM
Subject: RE: sequence OF what? - structores
>From: Lucius Hilley <l3euphoria at bellsouth.net>
>Subject: sequence OF what? - structores
>Only thing I can figure you can get out of that is.
>Very fixed, non-dynamic typing.
>I know, you say, What?
Actually, I know what you mean. It's supposed to be fixed. Most of the
variables we use will be aggregates, long sequences containing lots of the
same type of value. Unfortunately, at the moment traditional type checking
is horribly slow. A 2 element sequence wouldn't take long, but to check a
1000-element sequence is too slow, cause traditional type checking has to
check every single element every time something changes. I don't mean for
the 'of' keyword to be appropriate for structures, that is a separate
issue,
and totally transparent to the idea of "of".
>Using OF how would you type handle this?
>}}}
<eucode>
>sequence pb
>
>pb = {"Johnny", "Robert", "Princeton", "Jr.", 12, 31, 1977, 150, "blue",
>"blonde", 6, 2, 'M'}
></eucode>
{{{
As I said above, "of" doesn't affect structures at all. For an individual
element comprised of different types of values, a traditional type check
would need to be used. However, for the sequence comprised of these
structures:
type PhoneBookItem( sequence s )
... normal type checking, make sure that each value is ok ...
end type
type addressbook (sequence of PhoneBookItem s)
return 1
end type
addressbook directory
directory = {}
directory &= {pb}
>----
>I stand by my proposal... or should I say Chris Bensler's proposal of
>structures.
>Maybe, someone mentioned before him. I wouldn't doubt it. Either way.
>Something like this can handle it.
<SNIP>
>}}}
<eucode>
>struct PhoneBookItem
> {string, string, string, string, month, mday, year, string, string,
>feet,
>inches, gender}
>end struct
></eucode>
{{{
As you said, you don't know what to do with strings :oP
I don't know exactly what the best thing to do is regarding structures,
but
if they become a type, then they can be used by the "of" system. No
problem.
I don't mean to add anything new to the language as far as language
enhancements. The thing that "of" does, and the only thing that of does,
is
allow user defined types to be USEFUL for anything other than simple
things.
MrTrick
3. Re: sequence OF what? - structores
>From: Lucius Hilley <l3euphoria at bellsouth.net>
>I Looked back through some of that history of structure suggestions.
>
>Just take a look at the link I supplied.
>It shows that this subject as been beat to death before.
>And this link displays Rob's view on structures and
>some of what we have been asking for.
Well, the "OF" is completely independant of the idea of structures. It's not
the same thing at all.
MrTrick
4. Re: sequence OF what? - structores
Unkmar wrote:
>
> Just take a look at the link I supplied.
> It shows that this subject as been beat to death before.
> And this link displays Rob's view on structures and
> some of what we have been asking for.
>
> <a
> href="http://www.listfilter.com/cgi-bin/esearch.exu?postedBy=Craig&keywords=struct">http://www.listfilter.com/cgi-bin/esearch.exu?postedBy=Craig&keywords=struct</a>
> ures
Yes, I read that. There are some logical inconsistencies there, you
can find them for yourself.
While we're at it, let me prove why my rusty Ford Pinto is the
*best car in the world*:
Lowest monthly payments ($0),
unlikely to be stolen (unlike those bloated Mercedes),
uses almost no gas at all (won't start)
cannot roll over (unless I get it started).
Regards,
Irv
