Is this safe? [Answered]

[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...

[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.

[miso]

Code: Select all

PeekA(*pos+offset)

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.

[Little John]

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[STARGÅTE]

Code: Select all

PeekA(*pos+offset)

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.

[miso]

Thanks for the clarification.