Hairy Pixels via fpc-pascal schrieb am
Do., 10. Aug. 2023, 18:30:
>
>
> > On Aug 10, 2023, at 5:43 AM, Bernd Oppolzer via fpc-pascal <
> fpc-pascal@lists.freepascal.org> wrote:
> >
> > PTRADD (p, i) - p is type ANYPTR, i is integer, result is of type ANYPTR
> > PTRDIFF (p1, p2) - two pointers,
On Thu, 10 Aug 2023, Hairy Pixels via fpc-pascal wrote:
On Aug 10, 2023, at 10:49 AM, Sven Barth via fpc-pascal
wrote:
Then you simply aren't using them often enough. E.g. the RTTI internal code is
full of them and additional typecasts would simply muddle up otherwise
relatively
> On Aug 10, 2023, at 10:49 AM, Sven Barth via fpc-pascal
> wrote:
>
> Then you simply aren't using them often enough. E.g. the RTTI internal code
> is full of them and additional typecasts would simply muddle up otherwise
> relatively clear code.
>
Here's a question, what is the full
Hallo,
i tried to run my program under LLVM (from july fpc) and it crashes?
Program received signal SIGSEGV, Segmentation fault.
0x0042e5f1in SYSTEM_$$_SYSGETMEM_FIXED$QWORD$$POINTER()
(gdb) bt
#0 0x0042e5f1in SYSTEM_$$_SYSGETMEM_FIXED$QWORD$$POINTER()
#1 0x0041b92ain
> On Aug 9, 2023, at 4:37 PM, Tomas Hajny via fpc-pascal
> wrote:
>
> No, the offset is not a memory address but just a number of bytes (which is
> also the reason why you cannot add the pointers together, but you can add a
> number to a pointer. As an example, you could use this operation
> On Aug 10, 2023, at 5:43 AM, Bernd Oppolzer via fpc-pascal
> wrote:
>
> PTRADD (p, i) - p is type ANYPTR, i is integer, result is of type ANYPTR
> PTRDIFF (p1, p2) - two pointers, the result is integer
> ANYPTR is a predefined type, compatible with every (typed pointer)
> ADDR (x) is a
On Thu, 10 Aug 2023, Hairy Pixels via fpc-pascal wrote:
On Aug 10, 2023, at 4:23 PM, Hairy Pixels wrote:
// 4) subscript (inc and dereference in one step)
v := i[1];
#4 was not in the list for example so I wonder what others exist.
I found another one in the typinfo.pp unit. What
> On Aug 10, 2023, at 4:23 PM, Hairy Pixels wrote:
>
> // 4) subscript (inc and dereference in one step)
> v := i[1];
>
>
> #4 was not in the list for example so I wonder what others exist.
I found another one in the typinfo.pp unit. What does,
1) taking the address of a type
> On Aug 10, 2023, at 2:18 PM, Michael Van Canneyt via fpc-pascal
> wrote:
>
> https://www.freepascal.org/docs-html/current/ref/refse15.html#x42-620003.4
This document doesn't really do a great enumerating all the operators so I'm
not sure if the list is complete. I think the list is:
var
1) what does "i := x - x;" do and what is it's purpose and why doesn't "x + x"
work the same?
Subtracting pointers may be useful if they point to consecutive memory.
The Result is the number of bytes between both addresses.
Adding pointers is useless, you would get a pointer pointing to
FWIW, when I added similar functionality to my Stanford Pascal compiler,
I chose not to allow arithmetic
of pointers, but instead I added some functions:
PTRADD (p, i) - p is type ANYPTR, i is integer, result is of type ANYPTR
PTRDIFF (p1, p2) - two pointers, the result is integer
ANYPTR is a
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