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Is this safe? [Answered]
Posted: Thu Jan 22, 2026 6:53 pm
by miso
Code: Select all
a+1
*pos+4
a+b-1
offset+1
PeekA(*pos+offset)
Is this safe? I'm always afraid if somehow I will increase something instead of just offsetting...
Re: Is this safe?
Posted: Thu Jan 22, 2026 7:16 pm
by NicTheQuick
What do you mean with safe?
It's basically syntactic sugar for:
Code: Select all
a=a+1
*pos=*pos+4
a=a+b-1
offset=offset+1
But I don't know what you mean with the `PeekA()` line. That's not safe of course because it's an invalid pointer, in this case you are trying to read a byte from address 5.
Re: Is this safe?
Posted: Thu Jan 22, 2026 7:38 pm
by miso
Yes I mean exactly that part. My concern: the parameter inside the bracket can not turn to be an addition in any case. Am I right? Sorry if the question is dumb, but I don't know how it is decided if it's an increment or not.
Re: Is this safe?
Posted: Thu Jan 22, 2026 9:52 pm
by Little John
<removed>
Re: Is this safe?
Posted: Thu Jan 22, 2026 10:07 pm
by STARGÅTE
miso wrote: Thu Jan 22, 2026 7:38 pm
Yes I mean exactly that part. My concern: the parameter inside the bracket can not turn to be an addition in any case. Am I right? Sorry if the question is dumb, but I don't know how it is decided if it's an increment or not.
If you write an expression like:
a +
b
the value of
a itself is only increased by
b, if
a is in front of the code line.
So with "function(
a+
b)" you do
not change the value of
a itself.
With "c =
a +
b" you do
not change the value of
a itself.
Only with "
a +
b" alone,
a is increased by
b after its evaluation.
Re: Is this safe?
Posted: Thu Jan 22, 2026 10:23 pm
by miso
Thanks for the clarification.