digitalmars.D - Deleting Entries from an Array
- Daniel Biehl (22/22) Jun 27 2007 Hello,
- Lars Ivar Igesund (8/38) Jun 27 2007 At least literals are put in read only memory on Linux, so you will have...
- Daniel Biehl (6/47) Jun 27 2007 Ah thats it!!
- Deewiant (3/9) Jun 27 2007 There's no reason not to allow char[] s = "Hello", you just can't write ...
- Daniel Biehl (1/42) Jun 27 2007
- Daniel Biehl (6/36) Jun 27 2007 gdb reports:
Hello,
I play a little bit with D to learn something more about it. One
interesting feature is splicing of arrays. I wrote a little function to
delete some entries from an array of chars. I thought it was easy, but I
only get a memory access error (Speicherzugriffsfehler in german) under
Linux with DMD 1.015 and gdc 0.24 and on Windows XP only with gdc 0.23.
Where is the Bug? Me or Phobos/DMD/GDC?
module tt;
import std.stdio;
char[] cut(inout char[] s, size_t index, size_t count) {
s[index..length - count] = s[index+count..length].dup;
s.length = s.length - count;
return s;
}
void main()
{
char[] s = "Hello World";
writefln(s.length);
writefln(s.cut(1,1));
writefln(s.length);
}
Greets Daniel
Jun 27 2007
Daniel Biehl wrote:
Hello,
I play a little bit with D to learn something more about it. One
interesting feature is splicing of arrays. I wrote a little function to
delete some entries from an array of chars. I thought it was easy, but I
only get a memory access error (Speicherzugriffsfehler in german) under
Linux with DMD 1.015 and gdc 0.24 and on Windows XP only with gdc 0.23.
Where is the Bug? Me or Phobos/DMD/GDC?
module tt;
import std.stdio;
char[] cut(inout char[] s, size_t index, size_t count) {
s[index..length - count] = s[index+count..length].dup;
s.length = s.length - count;
return s;
}
void main()
{
char[] s = "Hello World";
writefln(s.length);
writefln(s.cut(1,1));
writefln(s.length);
}
Greets Daniel
At least literals are put in read only memory on Linux, so you will have to
dup s before cutting it.
--
Lars Ivar Igesund
blog at http://larsivi.net
DSource, #d.tango & #D: larsivi
Dancing the Tango
Jun 27 2007
Ah thats it!! Thanks, but: Why is it work with DMD 1.016 on Windows XP (not with GDC!!!), there comes no error. I know on Windows literals are not stored in read only memory, like on Linux, but why I can write on Windows with DMD char[] s = "Hello" and must write on Linux char[] s = "Hello".dup. Isn't it a little inconsitent? Maybe the compiler should make a .dup if a initialize a dynamic array variable? Greets Daniel Lars Ivar Igesund Wrote:Daniel Biehl wrote:Hello, I play a little bit with D to learn something more about it. One interesting feature is splicing of arrays. I wrote a little function to delete some entries from an array of chars. I thought it was easy, but I only get a memory access error (Speicherzugriffsfehler in german) under Linux with DMD 1.015 and gdc 0.24 and on Windows XP only with gdc 0.23. Where is the Bug? Me or Phobos/DMD/GDC? module tt; import std.stdio; char[] cut(inout char[] s, size_t index, size_t count) { s[index..length - count] = s[index+count..length].dup; s.length = s.length - count; return s; } void main() { char[] s = "Hello World"; writefln(s.length); writefln(s.cut(1,1)); writefln(s.length); } Greets DanielAt least literals are put in read only memory on Linux, so you will have to dup s before cutting it. -- Lars Ivar Igesund blog at http://larsivi.net DSource, #d.tango & #D: larsivi Dancing the Tango
Jun 27 2007
Deewiant <deewiant.doesnotlike.spam gmail.com> Daniel Biehl wrote:Why is it work with DMD 1.016 on Windows XP (not with GDC!!!), there comes no error. I know on Windows literals are not stored in read only memory, like on Linux, but why I can write on Windows with DMD char[] s = "Hello" and must write on Linux char[] s = "Hello".dup. Isn't it a little inconsitent? Maybe the compiler should make a .dup if a initialize a dynamic array variable?There's no reason not to allow char[] s = "Hello", you just can't write to it. The const semantics in D 2.0 would catch this error.
Jun 27 2007
Lars Ivar Igesund Wrote:Daniel Biehl wrote:Hello, I play a little bit with D to learn something more about it. One interesting feature is splicing of arrays. I wrote a little function to delete some entries from an array of chars. I thought it was easy, but I only get a memory access error (Speicherzugriffsfehler in german) under Linux with DMD 1.015 and gdc 0.24 and on Windows XP only with gdc 0.23. Where is the Bug? Me or Phobos/DMD/GDC? module tt; import std.stdio; char[] cut(inout char[] s, size_t index, size_t count) { s[index..length - count] = s[index+count..length].dup; s.length = s.length - count; return s; } void main() { char[] s = "Hello World"; writefln(s.length); writefln(s.cut(1,1)); writefln(s.length); } Greets DanielAt least literals are put in read only memory on Linux, so you will have to dup s before cutting it. -- Lars Ivar Igesund blog at http://larsivi.net DSource, #d.tango & #D: larsivi Dancing the Tango
Jun 27 2007
Daniel Biehl schrieb:
Hello,
I play a little bit with D to learn something more about it. One
interesting feature is splicing of arrays. I wrote a little function to
delete some entries from an array of chars. I thought it was easy, but I
only get a memory access error (Speicherzugriffsfehler in german) under
Linux with DMD 1.015 and gdc 0.24 and on Windows XP only with gdc 0.23.
Where is the Bug? Me or Phobos/DMD/GDC?
module tt;
import std.stdio;
char[] cut(inout char[] s, size_t index, size_t count) {
s[index..length - count] = s[index+count..length].dup;
s.length = s.length - count;
return s;
}
void main()
{
char[] s = "Hello World";
writefln(s.length);
writefln(s.cut(1,1));
writefln(s.length);
}
Greets Daniel
gdb reports:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1209001280 (LWP 10327)]
0x44e6bef5 in memcpy () from /lib/libc.so.6
Daniel
Jun 27 2007