• Brendan (1/1) Sep 02 2008 I looked through the Phobos page, but haven't found anything like it. Is...
• Brendan (7/8) Sep 02 2008 Well, I just used 'sleep' from the Linux shell instead. I don't understa...
• Jarrett Billingsley (4/15) Sep 02 2008 If you're expecting it to pause after each character.. you're missing br...
• Brendan (3/5) Sep 02 2008 Oooooh, what a foolish mistake! How could I forget that? Thanks for poin...
• Chris R. Miller (8/17) Sep 02 2008 acter.. you're missing braces around the body of the for loop, this isn'...
• Jarrett Billingsley (5/22) Sep 02 2008 Content-Disposition: inline
• Brendan (2/28) Sep 02 2008 Thanks! With a little quick tweaking it worked. But, even though I see t...
• BCS (4/39) Sep 02 2008 The act of making the screen show text is rather costly in time, so gene...
• Brendan (2/45) Sep 02 2008 Thanks for your responses, BCS. This is the first time I'm kind of commu...
• BCS (4/8) Sep 02 2008 If you are using the D web site interface, because it's broken (and has ...
• Brendan (2/15) Sep 03 2008 It's a lot better now, as I'm using Thunderbird. Thanks for the tip :)
• Denis Koroskin (14/49) Sep 02 2008 Google for "buffering". When you print something, it doesn't get display...
• Brendan (3/18) Sep 02 2008 Ahhh, a buffer!
• bearophile (4/5) Sep 02 2008 It's a mistake, but in the past years I have seen several similar mistak...
• Steven Schveighoffer (7/15) Sep 02 2008 Any reasonable syntax highlighting editor should show you that you forgo...
• BCS (2/16) Sep 02 2008 IIRC the are the standard sleep and usleep functions in std.c.something

Brendan <brenzie gmail.com> writes:

I looked through the Phobos page, but haven't found anything like it. Is there
a sort of delay function anywhere in Phobos?

Brendan <brenzie gmail.com> writes:

Brendan Wrote:

 I looked through the Phobos page, but haven't found anything like it. Is there
a sort of delay function anywhere in Phobos?

Well, I just used 'sleep' from the Linux shell instead. I don't understand yet
what I'm doing wrong with the following function, though. Could someone explain
and advise?


void scrollString( char[] s ) {
    for ( int i = 0; i < s.length; i++ )
      writef( s[i] );
      system( "sleep 0.2" );
  }

"Jarrett Billingsley" <jarrett.billingsley gmail.com> writes:

Content-Disposition: inline

On Tue, Sep 2, 2008 at 7:11 AM, Brendan <brenzie gmail.com> wrote:

 Brendan Wrote:

 I looked through the Phobos page, but haven't found anything like it. Is

 there a sort of delay function anywhere in Phobos?

 Well, I just used 'sleep' from the Linux shell instead. I don't understand
 yet what I'm doing wrong with the following function, though. Could someone
 explain and advise?


 void scrollString( char[] s ) {
    for ( int i = 0; i < s.length; i++ )
      writef( s[i] );
      system( "sleep 0.2" );
  }

If you're expecting it to pause after each character.. you're missing braces
around the body of the for loop, this isn't Python ;)

Brendan <brenzie gmail.com> writes:

Jarrett Billingsley Wrote:


 </blockquote></div><br>If you're expecting it to pause after each character..
you're missing braces around the body of the for loop, this isn't Python
;)<br></div>
 

Oooooh, what a foolish mistake! How could I forget that? Thanks for pointing it
out.

But the result isn't fruitful, though. When I run it, all I get is an empty
screen, then after many seconds the whole string is displayed at once (not to
mention I set the sleep time to 0.1 seconds). I'm probably missing something.
Any idea?

"Chris R. Miller" <lordSaurontheGreat gmail.com> writes:

Brendan wrote:
 Jarrett Billingsley Wrote:
=20
=20
 </blockquote></div><br>If you're expecting it to pause after each char=


acter.. you're missing braces around the body of the for loop, this isn't=
 Python ;)<br></div>

=20
 Oooooh, what a foolish mistake! How could I forget that? Thanks for poi=

nting it out.
=20
 But the result isn't fruitful, though. When I run it, all I get is an e=

mpty screen, then after many seconds the whole string is displayed at onc=
e (not to mention I set the sleep time to 0.1 seconds). I'm probably miss=
ing something. Any idea?

Flush the output?

"Jarrett Billingsley" <jarrett.billingsley gmail.com> writes:

Content-Disposition: inline

On Tue, Sep 2, 2008 at 1:37 PM, Chris R. Miller <
lordSaurontheGreat gmail.com> wrote:

 Brendan wrote:
 Jarrett Billingsley Wrote:


 </blockquote></div><br>If you're expecting it to pause after each


 character.. you're missing braces around the body of the for loop, this
 isn't Python ;)<br></div>

 Oooooh, what a foolish mistake! How could I forget that? Thanks for

 pointing it out.
 But the result isn't fruitful, though. When I run it, all I get is an

 empty screen, then after many seconds the whole string is displayed at once
 (not to mention I set the sleep time to 0.1 seconds). I'm probably missing
 something. Any idea?

 Flush the output?

Totally.

foreach(ch; s) { write(ch); fflush(stdout); system("pause 0.2"); }

Brendan <brenzie gmail.com> writes:

Jarrett Billingsley Wrote:

 On Tue, Sep 2, 2008 at 1:37 PM, Chris R. Miller <
 lordSaurontheGreat gmail.com> wrote:
 
 Brendan wrote:
 Jarrett Billingsley Wrote:


 </blockquote></div><br>If you're expecting it to pause after each


 character.. you're missing braces around the body of the for loop, this
 isn't Python ;)<br></div>

 Oooooh, what a foolish mistake! How could I forget that? Thanks for

 pointing it out.
 But the result isn't fruitful, though. When I run it, all I get is an

 empty screen, then after many seconds the whole string is displayed at once
 (not to mention I set the sleep time to 0.1 seconds). I'm probably missing
 something. Any idea?

 Flush the output?

 Totally.
 
 foreach(ch; s) { write(ch); fflush(stdout); system("pause 0.2"); }

Thanks! With a little quick tweaking it worked. But, even though I see the
effective result, I don't entirely understand what it means "to flush" the
output. I've never heard of this concept before and Google doesn't seem to
return any useful answers. Could you explain?

BCS <ao pathlink.com> writes:

Reply to Brendan,

 Jarrett Billingsley Wrote:
 
 On Tue, Sep 2, 2008 at 1:37 PM, Chris R. Miller <
 lordSaurontheGreat gmail.com> wrote:
 Brendan wrote:
 
 Jarrett Billingsley Wrote:
 
 </blockquote></div><br>If you're expecting it to pause after each
 


 character.. you're missing braces around the body of the for loop,
 this isn't Python ;)<br></div>
 
 Oooooh, what a foolish mistake! How could I forget that? Thanks for
 

 pointing it out.
 
 But the result isn't fruitful, though. When I run it, all I get is
 an
 

 empty screen, then after many seconds the whole string is displayed
 at once (not to mention I set the sleep time to 0.1 seconds). I'm
 probably missing something. Any idea?
 
 Flush the output?
 

 Totally.
 
 foreach(ch; s) { write(ch); fflush(stdout); system("pause 0.2"); }
 

 Thanks! With a little quick tweaking it worked. But, even though I see
 the effective result, I don't entirely understand what it means "to
 flush" the output. I've never heard of this concept before and Google
 doesn't seem to return any useful answers. Could you explain?
 

The act of making the screen show text is rather costly in time, so generally 
libs buffer your output, often until a newline or some preset amount. Flush 
just forces a buffer flush and the resultant output.

Brendan <brenzie gmail.com> writes:

BCS Wrote:

 Reply to Brendan,
 
 Jarrett Billingsley Wrote:
 
 On Tue, Sep 2, 2008 at 1:37 PM, Chris R. Miller <
 lordSaurontheGreat gmail.com> wrote:
 Brendan wrote:
 
 Jarrett Billingsley Wrote:
 
 </blockquote></div><br>If you're expecting it to pause after each
 


 character.. you're missing braces around the body of the for loop,
 this isn't Python ;)<br></div>
 
 Oooooh, what a foolish mistake! How could I forget that? Thanks for
 

 pointing it out.
 
 But the result isn't fruitful, though. When I run it, all I get is
 an
 

 empty screen, then after many seconds the whole string is displayed
 at once (not to mention I set the sleep time to 0.1 seconds). I'm
 probably missing something. Any idea?
 
 Flush the output?
 

 Totally.
 
 foreach(ch; s) { write(ch); fflush(stdout); system("pause 0.2"); }
 

 Thanks! With a little quick tweaking it worked. But, even though I see
 the effective result, I don't entirely understand what it means "to
 flush" the output. I've never heard of this concept before and Google
 doesn't seem to return any useful answers. Could you explain?
 

 
 The act of making the screen show text is rather costly in time, so generally 
 libs buffer your output, often until a newline or some preset amount. Flush 
 just forces a buffer flush and the resultant output.
 
 

Thanks for your responses, BCS. This is the first time I'm kind of
communicating through a newsgroup such as this, as I'm normally used to a
forum. Why are your two messages separate from the thread?

BCS <ao pathlink.com> writes:

Reply to Brendan,

 Thanks for your responses, BCS. This is the first time I'm kind of
 communicating through a newsgroup such as this, as I'm normally used
 to a forum. Why are your two messages separate from the thread?
 

If you are using the D web site interface, because it's broken (and has been 
for years). Best approach is to get a "real" newsgroup client program,
thunderbird 
works, I use Omea by jetbrains and IIRC Outlook also does newsgroups.

Brendan <brenzie gmail.com> writes:

BCS wrote:
 Reply to Brendan,
 
 Thanks for your responses, BCS. This is the first time I'm kind of
 communicating through a newsgroup such as this, as I'm normally used
 to a forum. Why are your two messages separate from the thread?

 
 If you are using the D web site interface, because it's broken (and has 
 been for years). Best approach is to get a "real" newsgroup client 
 program, thunderbird works, I use Omea by jetbrains and IIRC Outlook 
 also does newsgroups.
 
 

It's a lot better now, as I'm using Thunderbird. Thanks for the tip :)

"Denis Koroskin" <2korden gmail.com> writes:

On Wed, 03 Sep 2008 00:24:02 +0400, Brendan <brenzie gmail.com> wrote:

 Jarrett Billingsley Wrote:

 On Tue, Sep 2, 2008 at 1:37 PM, Chris R. Miller <
 lordSaurontheGreat gmail.com> wrote:

 Brendan wrote:
 Jarrett Billingsley Wrote:


 </blockquote></div><br>If you're expecting it to pause after each


 character.. you're missing braces around the body of the for loop,  

 this
 isn't Python ;)<br></div>

 Oooooh, what a foolish mistake! How could I forget that? Thanks for

 pointing it out.
 But the result isn't fruitful, though. When I run it, all I get is  


 an
 empty screen, then after many seconds the whole string is displayed  

 at once
 (not to mention I set the sleep time to 0.1 seconds). I'm probably  

 missing
 something. Any idea?

 Flush the output?

 Totally.

 foreach(ch; s) { write(ch); fflush(stdout); system("pause 0.2"); }

 Thanks! With a little quick tweaking it worked. But, even though I see  
 the effective result, I don't entirely understand what it means "to  
 flush" the output. I've never heard of this concept before and Google  
 doesn't seem to return any useful answers. Could you explain?

Google for "buffering". When you print something, it doesn't get displayed  
immediately. Instead, the string is copied to some internal buffer and  
when it gets full (or close to full) it is then flushed, i.e. its contents  
copied to the console and buffer size reset. Something like this:

char[] buffer;

void writefln(char[] str)
{
   buffer ~= str;
   if (buffer.length > 1024) {
     doTheRealPrinting(buffer);
     buffer.length = 0;
   }
}

Brendan <brenzie gmail.com> writes:

Denis Koroskin Wrote:

 Google for "buffering". When you print something, it doesn't get displayed  
 immediately. Instead, the string is copied to some internal buffer and  
 when it gets full (or close to full) it is then flushed, i.e. its contents  
 copied to the console and buffer size reset. Something like this:
 
 char[] buffer;
 
 void writefln(char[] str)
 {
    buffer ~= str;
    if (buffer.length > 1024) {
      doTheRealPrinting(buffer);
      buffer.length = 0;
    }
 }

Ahhh, a buffer!

So basically, in the correct piece of code (the scroll function) a few messages
back, in the for loop, the buffer is constantly unloading the characters from
itself? It is so beautiful. Thanks :)

bearophile <bearophileHUGS lycos.com> writes:

Brendan:
 Oooooh, what a foolish mistake! How could I forget that? Thanks for pointing
it out.

It's a mistake, but in the past years I have seen several similar mistakes in
real programs written in C-like languages. That's why I'm a fan of semantically
significant indentations :-) (Or of a built-in lint-like capability of the
language that signals such indentation errors are syntax errors).

Bye,
bearophile

"Steven Schveighoffer" <schveiguy yahoo.com> writes:

"bearophile" wrote
 Brendan:
 Oooooh, what a foolish mistake! How could I forget that? Thanks for 
 pointing it out.

 It's a mistake, but in the past years I have seen several similar mistakes 
 in real programs written in C-like languages. That's why I'm a fan of 
 semantically significant indentations :-) (Or of a built-in lint-like 
 capability of the language that signals such indentation errors are syntax 
 errors).

Any reasonable syntax highlighting editor should show you that you forgot 
something.

In vim, if I forget something like this, the second statement's indent jumps 
back to the same level as the if statement, signalling that I forgot to add 
the curly brace.

-Steve 

BCS <ao pathlink.com> writes:

Reply to Brendan,

 Brendan Wrote:
 
 I looked through the Phobos page, but haven't found anything like it.
 Is there a sort of delay function anywhere in Phobos?
 

 Well, I just used 'sleep' from the Linux shell instead. I don't
 understand yet what I'm doing wrong with the following function,
 though. Could someone explain and advise?
 
 void scrollString( char[] s ) {
 for ( int i = 0; i < s.length; i++ )
 writef( s[i] );
 system( "sleep 0.2" );
 }

IIRC the are the standard sleep and usleep functions in std.c.something