digitalmars.D.learn - Concat or add ~. Is this a bug?
- jicman (34/34) Mar 21 2005 Should this compile? it should, at least, gives me warnings.
- Regan Heath (8/35) Mar 21 2005 No. IIRC a statement that is pointless or has no effect is an error. I
- jicman (7/44) Mar 21 2005 Well, it does...
- Regan Heath (4/59) Mar 21 2005 Indeed. I'm cross-posting this to digitalmars.D.bugs so Walter will see ...
- Thomas Kuehne (12/39) Mar 22 2005 -----BEGIN PGP SIGNED MESSAGE-----
Should this compile? it should, at least, gives me warnings.
<code>
01. import std.stdio;
02. void TurnToMonDigit(char[] mon)
03. {
04. char[] mm;
05. mm = "I am trying to see if this also breaks" ~ mon ~ " more \n" ~
06. "because this broke for me" ~
07. "yep it did" ~
08. "of course, new lines are needed\n";
09. "new lines also\n";
10. "this should not compile" ~
11. " no it should not ";
12. writefln(mm);
13.
14. }
15. void main (char[][] args)
16. {
17. TurnToMonDigit("JUU");
18. }
</code>
Note line 08 and 09. They have no variable assignment. It's just an empty
"";
"";
but what causes me more trouble is what follows,
"..." ~
"..." ~
"..." ~
"...";
a concatenation to nothing. Well, this was a bug in my program. :-) So, I
wasn't testing or anything. :-)
any ideas why this should compile?
thanks,
josé
Mar 21 2005
On Mon, 21 Mar 2005 22:51:29 +0000 (UTC), jicman <jicman_member pathlink.com> wrote:Should this compile?No. IIRC a statement that is pointless or has no effect is an error. I can't, however, seem to find the part of the spec that says this, so I might be imagining it.<code> 01. import std.stdio; 02. void TurnToMonDigit(char[] mon) 03. { 04. char[] mm; 05. mm = "I am trying to see if this also breaks" ~ mon ~ " more \n" ~ 06. "because this broke for me" ~ 07. "yep it did" ~ 08. "of course, new lines are needed\n"; 09. "new lines also\n"; 10. "this should not compile" ~ 11. " no it should not "; 12. writefln(mm); 13. 14. } 15. void main (char[][] args) 16. { 17. TurnToMonDigit("JUU"); 18. } </code>Lines 8, 9, and 10 + 11 are pointless statements and should be errors.but what causes me more trouble is what follows, "..." ~ "..." ~ "..." ~ "..."; a concatenation to nothing.That's another pointless statement and should be an error. Regan
Mar 21 2005
Well, it does... Plus, I kept thinking that Windows has memory problems (which I know it does, but this was no way to prove it. :-)) I kept looking as to why I was missing half of my prints! And couldn't understand why. Then I reaaaaaaally looked at the code and saw the bug. So... anyway, perhaps it should be fixed. josé Regan Heath says...On Mon, 21 Mar 2005 22:51:29 +0000 (UTC), jicman <jicman_member pathlink.com> wrote:Should this compile?No. IIRC a statement that is pointless or has no effect is an error. I can't, however, seem to find the part of the spec that says this, so I might be imagining it.<code> 01. import std.stdio; 02. void TurnToMonDigit(char[] mon) 03. { 04. char[] mm; 05. mm = "I am trying to see if this also breaks" ~ mon ~ " more \n" ~ 06. "because this broke for me" ~ 07. "yep it did" ~ 08. "of course, new lines are needed\n"; 09. "new lines also\n"; 10. "this should not compile" ~ 11. " no it should not "; 12. writefln(mm); 13. 14. } 15. void main (char[][] args) 16. { 17. TurnToMonDigit("JUU"); 18. } </code>Lines 8, 9, and 10 + 11 are pointless statements and should be errors.but what causes me more trouble is what follows, "..." ~ "..." ~ "..." ~ "..."; a concatenation to nothing.That's another pointless statement and should be an error. Regan
Mar 21 2005
On Mon, 21 Mar 2005 23:58:32 +0000 (UTC), jicman <jicman_member pathlink.com> wrote:Well, it does... Plus, I kept thinking that Windows has memory problems (which I know it does, but this was no way to prove it. :-)) I kept looking as to why I was missing half of my prints! And couldn't understand why. Then I reaaaaaaally looked at the code and saw the bug. So... anyway, perhaps it should be fixed.Indeed. I'm cross-posting this to digitalmars.D.bugs so Walter will see it. Reganjosé Regan Heath says...On Mon, 21 Mar 2005 22:51:29 +0000 (UTC), jicman <jicman_member pathlink.com> wrote:Should this compile?No. IIRC a statement that is pointless or has no effect is an error. I can't, however, seem to find the part of the spec that says this, so I might be imagining it.<code> 01. import std.stdio; 02. void TurnToMonDigit(char[] mon) 03. { 04. char[] mm; 05. mm = "I am trying to see if this also breaks" ~ mon ~ " more \n" ~ 06. "because this broke for me" ~ 07. "yep it did" ~ 08. "of course, new lines are needed\n"; 09. "new lines also\n"; 10. "this should not compile" ~ 11. " no it should not "; 12. writefln(mm); 13. 14. } 15. void main (char[][] args) 16. { 17. TurnToMonDigit("JUU"); 18. } </code>Lines 8, 9, and 10 + 11 are pointless statements and should be errors.but what causes me more trouble is what follows, "..." ~ "..." ~ "..." ~ "..."; a concatenation to nothing.That's another pointless statement and should be an error. Regan
Mar 21 2005
Thomas Kuehne <thomas-dloop kuehne.thisisspam.cn> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Regan Heath schrieb am Tue, 22 Mar 2005 12:15:25 +1200:On Mon, 21 Mar 2005 23:58:32 +0000 (UTC), jicman <jicman_member pathlink.com> wrote:Added to DStress as http://dstress.kuehne.cn/nocompile/double_quoted_string_19.d http://dstress.kuehne.cn/nocompile/double_quoted_string_20.d Thomas -----BEGIN PGP SIGNATURE----- iD8DBQFCP7503w+/yD4P9tIRAuP7AJ9Cw8BYee44RxR3LJ9VBKfTWb6BYQCfcK2m FOIeQVHUtyCD2D2aYV2IaTs= =eCiF -----END PGP SIGNATURE-----No. IIRC a statement that is pointless or has no effect is an error. I can't, however, seem to find the part of the spec that says this, so I might be imagining it.<code> 01. import std.stdio; 02. void TurnToMonDigit(char[] mon) 03. { 04. char[] mm; 05. mm = "I am trying to see if this also breaks" ~ mon ~ " more \n" ~ 06. "because this broke for me" ~ 07. "yep it did" ~ 08. "of course, new lines are needed\n"; 09. "new lines also\n"; 10. "this should not compile" ~ 11. " no it should not "; 12. writefln(mm); 13. 14. } 15. void main (char[][] args) 16. { 17. TurnToMonDigit("JUU"); 18. } </code>
Mar 22 2005