[Info-vax] DEC Basic and dynamic memory ?

[VAXman- at SendSpamHere.ORG]

In article <st4t2h$gh9$2 at gioia.aioe.org>, Richard Maher <maher_rjSPAMLESS at hotmail.com> writes:
>On 29/01/2022 3:57 am, Simon Clubley wrote:
>> On 2022-01-28, Dave Froble <davef at tsoft-inc.com> wrote:
>>> On 1/28/2022 12:31 PM, John Reagan wrote:
>>>> 4) As we've discussed the BASIC cross-compiler is still not available due to G2L not being
>>>> able to totally handle how the BASIC MAP statement is described to GEM.  The GEM to
>>>> LLVM module for common blocks is radically different.  Could you write a DIRECTORY
>>>> replacement in BASIC without using MAP?
>>>
>>> Why, yes, I'm rather sure I could.  For example, from one of my routines:
>>>
>>>           RECORD FABBLK                                   !
>>>           RECORD NAMBLK                                   !
>>>           RECORD FIBBLK                                   !  FIB structure
>>>
>>> And now I'm waiting for you to say that the Basic RECORD statement has the same
>>> problems as MAP.
>>>
>> 
>> How easy is it in DEC Basic to build a tree of (say) 1000 nodes of
>> a custom data structure in dynamic memory and then walk the tree
>> either depth-first or breadth-first ?
>> 
>> I've had a quick look at the dynamic storage section of the DEC Basic user
>> manual, but I don't see how you link a set of nodes together into a tree.
>> However, as mentioned previously, I don't know DEC Basic and searching
>> for the word pointer didn't reveal anything appropriate, so I assume
>> it's another keyword I am not aware of.
>> 
>> In addition, how easy is this to do if the nodes are not all of the
>> same record type, but have a common tag at the start of each record
>> to say what kind of record it actually is ? I see you have variant
>> records in DEC Basic. Do they also work in a dynamic memory based
>> tree structure ?
>> 
>> Simon.
>> 
>
>I'd employ Lib$ malloc, realloc, and calloc

How C senor.

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