OpenEuphoria

1. scope problem

• Posted by canadiancoder Sep 04, 2008
• 944 views
• Last edited Sep 05, 2008

Hi all, I need help with a scope problem in my Euphoria program, a fantasy combat game that I am making. I have global constants defined in one of my include files to act as symbols for sequence indexes. I have a function in another include file which takes this sequence as a parameter. The problem is that even though the 2nd include includes the first, the function can't "see" them, so I get a undefined symbol type error. The only way I see to fix this is to copy the constants (without global) into the second include file, but this seems like an ugly kludge. There must be a "proper" way to do this.

Thanks.

3. Re: scope problem

• Posted by mattlewis (admin) Sep 05, 2008
• 926 views

This wouldn't be a problem in 4.0, but for 3.1 the best solution is to create a third include file. Basically, you need to analyze your code to determine the dependencies. So if both file A and B need functionA, then move functionA to file C and have both A and B include it. Another alternative (for routines, at least) is to assign the routine_id of the routine to a variable defined early enough to be seen where you need it.

It sounds like you simply need to be able to see the sequences, so you could move them to their own file, and call it constants.e, or something obvious like that.

Matt

5. Re: scope problem

• Posted by mattlewis (admin) Sep 05, 2008
• 873 views
• Last edited Sep 06, 2008

characters.e 
 
sequence Character 
Character = { "Lothar the Brave ", 34, 56, 43, "Long Sword", ... etc. } 
 
global constant  
Name = 1, ...etc... Weapon = 5 

items.e 
 
include characters.e 
 
procedure ArmCharacter( sequence chr ) 
    .. some code... 
    printf(1, "Your current weapon is: %s", { c[Weapon] } ) 
end procedure 

What svn revision is your binary? And which file is included first?

Matt

7. Re: scope problem

• Posted by DerekParnell (admin) Sep 06, 2008
• 972 views

Ok, so now we can guess you are using v3.1 and "include each other" is a definite issue which wasn't mentioned before.

In version 3, even though you can have files include each other, you still can't reference something before Euphoria has seen its declaration.

One way to get around this is to extract the stuff that is commonly needed in both files into a third file.

-- constants.e -- 
global constant Name = 1,  Weapon = 5 

-- characters.e -- 
include constants.e 
Character = { "Lothar the Brave ", 34, 56, 43, "Long Sword"} 

-- items.e -- 
include constants.e 
include characters.e 
 
procedure ArmCharacter( sequence chr )  
 
.. some code...  
 
printf(1, "Your current weapon is: %s", { c[Weapon] } )  
 
end procedure 

9. Re: scope problem

• Posted by canadiancoder Sep 06, 2008
• 862 views
• Last edited Sep 07, 2008

Just FYI, I modified my code to use a third global symbols include file and now everything works fine.

Thanks again for the help.