Hi Tomas,
On 4/4/23 09:01, Tomas Hajny via fpc-pascal wrote:
[cut]
You don't need to change "var" to "const" - if you want to ensure the
variables to persist in between the function/procedure runs, you need to
move them to the global level, i.e. outside of the functions/procedures.
It is not advisable as a general practice (to keep all variables
globally), because then you might e.g. access the same variable from
multiple functions by mistake, but it would probably solve your issue.
Obviously, you might need to solve potential conflicts if you use the
same variable names in multiple functions/procedures (e.g. by prepending
the function/procedure name to the variable name or something like that).
I could move them to global scope, and add a prefix to avoid name
collisions, but using a "const" section seems more readable to me since
I don't need to add a prefix.
The wiki page says (https://wiki.freepascal.org/Const):
"The declaration const in a Pascal program is used to inform the
compiler that certain identifiers which are being declared are
constants, that is, they are initialized with a specific value at
compile time as opposed to a variable which is initialized at run time.
However, the default setting in Free Pascal is to allow const
identifiers to be re-assigned to."
Then it says there is a flag to make reassigning to a const variable an
error. But if I ignore that, it would seem this is just what I need,
since this seems to make the variable have a whole-program lifetime, no ?
What is the technical downside to using "const", or is it just cosmetic ?
Regards,
Jacob
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