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Forum Index : Microcontroller and PC projects : Complex data types
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elk1984 Senior Member  Joined: 11/07/2020 Location: United KingdomPosts: 227 |
I know it's Basic, but I really miss my structures and arrays of arrays. Short of digging into Comp Sci levels of data structure theory or C, has anyone else modelled anything approaching a structure, arraylist or similar "record" like data structures? I saw on a different thread a member was working on a database include / library but a fully fledged DB whilst useful is overkill for day to day usage for me. |
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thwill Guru  Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
You can do some things with strings containing comma separated lists of items and the FIELD$() function. I've also got some string list, set and map implementations here: https://github.com/thwill1000/sptools/tree/master/src/common - check the "tests/" folder for example usage. I don't claim they are great, but I've found them useful. But really if you need anything complex I think you'll need to declare an array of integers and treat it as a byte array using the PEEK() and POKE() functions with offsets ... it's back to data-structure BASICs. Best wishes, Tom Edited 2020-09-23 05:32 by thwill Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| William Leue Guru Joined: 03/07/2020 Location: United StatesPosts: 381 |
I also pack individual small pieces of data into integer variables and then unpack them. This compensates for the fact that functions cannot return arrays. Of course you can also use a subroutine with pass by reference to return multiple values, or just put return values into an array. *sigh* I miss C structs, C++ and Java object-orientation, and a lot of modern language features. But it is kind of a nice challenge writing in BASIC after years of using other languages. The most irritating thing for me about MMBasic is the total lack of name spaces. For instance, there are no name spaces for different types of variable, so, for instance, if you have a variable VAR and a variable VAR$, they collide. And user variables and reserved words also collide. Even const names and variables collide, as do variables with different case. Oh well, it's all part of the fun! -Bill |
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| mkopack73 Senior Member Joined: 03/07/2020 Location: United StatesPosts: 261 |
Likewise, it's really hard to go back to not having those things after 20 years of using them. Even just having a linked-list of structs would be SOOO nice again... But, it is what it is... |
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| William Leue Guru Joined: 03/07/2020 Location: United StatesPosts: 381 |
I use stacks and queues quite a lot in my MMBasic programs. In general, I just use global variables and hope for the best, e.g., option default integer dim stack(300) dim sptr = 0 sub push val stack(sptr) = val sptr = sptr+1 end sub function pop(val) sptr = sptr-1 pop = stack(sptr) end function But actually there may be a less dangerous way to implement these important data structures, something like this: sub stack operation, value static stk(300) static sptr select case operation case INIT sptr = 0 case PUSH stk(sptr) = value sptr = sptr+1 case POP sptr = sptr-1 value = stk(sptr) end select end sub -Bill |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3830 |
This string list implements stack operations without global state: https://github.com/thwill1000/sptools/blob/master/src/common/list.inc Regards, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| William Leue Guru Joined: 03/07/2020 Location: United StatesPosts: 381 |
Oh, very nice, Tom! -Bill |
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NPHighview Senior Member Joined: 02/09/2020 Location: United StatesPosts: 192 |
I arrived here very indirectly from my BASIC roots in the Hewlett-Packard ecosystem of the 1970's and 1980's. I'm missing map/reduce, zips, and list comprehensions in Haskell, F#, and other languages with "functional" features, like Python. I'm missing C Structs too, which I still think of, instead of "objects", when I plan out a new application. But then, that wouldn't be Basic. On the other hand, we have here an incredibly rich graphics and I/O environment, with plenty of opportunity to use good software development practices we've accumulated over the last 40-50 years, and a fabulous ecosystem with the likes of matherp and MauroXavier doing really impressive stuff. FFTs and quaternions in the firmware - who would have thunk it? Live in the Future. It's Just Starting Now! |
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