Re: stdout - autoflushing
Benji wrote: Hello, in order to have correctly displayed output (before reading something from stdin), I must call stdout.flush(). Sometimes, it's really annoying, especially when it is necessarry to call it 10 times. For example: write(Enter some string: ); stdout.flush(); string a = readln(); write(And again please: ); stdout.flush(); string b = readln(); ... Is there any way to prevent this? I doubt. Your IDE is buffering application's streams. -- Dejan Lekic dejan.lekic (a) gmail.com http://dejan.lekic.org
Re: stdout - autoflushing
On Friday, 6 December 2013 at 20:39:22 UTC, Dejan Lekic wrote: Benji wrote: Is there any way to prevent this? I doubt. Your IDE is buffering application's streams. You know though, this happens often enough that maybe we should just throw in a stdout.flush to the global readln function. I wouldn't put it on File.readln since that's likely wrong anyway, but on the global one it is probably what people want/expect anyway.
Re: stdout - autoflushing
On Tuesday, 3 December 2013 at 21:47:19 UTC, Adam D. Ruppe wrote: On Tuesday, 3 December 2013 at 20:36:22 UTC, Benji wrote: I am using Xubuntu, 64bit, and GDC as compiler Any IDE? I've seen ide consoles buffer differently because the runtime sees the target as a pipe instead of a user-interactive terminal. I'm using using Eclipse Kepler Standard(4.3). I tryied it via shell and everything worked fine also without stdout.flush().
Re: stdout - autoflushing
On Tuesday, 3 December 2013 at 21:23:19 UTC, Ali Çehreli wrote: On 12/03/2013 12:36 PM, Benji wrote: On Tuesday, 3 December 2013 at 19:33:47 UTC, Ali Çehreli wrote: On 12/03/2013 09:12 AM, Benji wrote: Hello, in order to have correctly displayed output (before reading something from stdin), I must call stdout.flush(). I am surprised that you need that. What is your platform? Normally, stdin and stdout are tied. Reading from stdin flushes stdout automatically. Ali I am using Xubuntu, 64bit, and GDC as compiler I've known this to be the case for cin and cout of C++. So, I've been assuming that to be universally true. Apparently not for C and D behavior is based on C. I wish std.stdio gave us C++'s 'tie'. Ali P.S. This makes some of the examples at ddili.org incorrect as I never call flush. :-/ The 'tie' is sometimes convenient, but it's not good in Unix style stdin/stout piping or similar situations with lots of simultaneous input and output.
stdout - autoflushing
Hello, in order to have correctly displayed output (before reading something from stdin), I must call stdout.flush(). Sometimes, it's really annoying, especially when it is necessarry to call it 10 times. For example: write(Enter some string: ); stdout.flush(); string a = readln(); write(And again please: ); stdout.flush(); string b = readln(); ... Is there any way to prevent this?
Re: stdout - autoflushing
On Tue, Dec 03, 2013 at 06:12:20PM +0100, Benji wrote:
Hello,
in order to have correctly displayed output (before reading
something from stdin),
I must call stdout.flush().
Sometimes, it's really annoying, especially when it is necessarry to
call it 10 times.
For example:
write(Enter some string: );
stdout.flush();
string a = readln();
write(And again please: );
stdout.flush();
string b = readln();
...
Is there any way to prevent this?
What about:
void prompt(A...)(string fmt, A args)
{
writef(fmt, args);
stdout.flush();
return readln();
}
auto a = prompt(Enter your name: );
auto b = prompt(Enter your age: ).to!int;
... // etc.
T
--
If you think you are too small to make a difference, try sleeping in a closed
room with a mosquito. -- Jan van Steenbergen
Re: stdout - autoflushing
On Tuesday, 3 December 2013 at 17:49:32 UTC, H. S. Teoh wrote:
On Tue, Dec 03, 2013 at 06:12:20PM +0100, Benji wrote:
Hello,
in order to have correctly displayed output (before reading
something from stdin),
I must call stdout.flush().
Sometimes, it's really annoying, especially when it is
necessarry to
call it 10 times.
For example:
write(Enter some string: );
stdout.flush();
string a = readln();
write(And again please: );
stdout.flush();
string b = readln();
...
Is there any way to prevent this?
What about:
void prompt(A...)(string fmt, A args)
{
writef(fmt, args);
stdout.flush();
return readln();
}
auto a = prompt(Enter your name: );
auto b = prompt(Enter your age: ).to!int;
... // etc.
T
Thanks, I didn't think about that (I'm beginner)
Re: stdout - autoflushing
On 12/03/2013 09:12 AM, Benji wrote: Hello, in order to have correctly displayed output (before reading something from stdin), I must call stdout.flush(). I am surprised that you need that. What is your platform? Normally, stdin and stdout are tied. Reading from stdin flushes stdout automatically. Ali
Re: stdout - autoflushing
On Tuesday, 3 December 2013 at 19:33:47 UTC, Ali Çehreli wrote: On 12/03/2013 09:12 AM, Benji wrote: Hello, in order to have correctly displayed output (before reading something from stdin), I must call stdout.flush(). I am surprised that you need that. What is your platform? Normally, stdin and stdout are tied. Reading from stdin flushes stdout automatically. Ali I am using Xubuntu, 64bit, and GDC as compiler
Re: stdout - autoflushing
On 12/03/2013 12:36 PM, Benji wrote: On Tuesday, 3 December 2013 at 19:33:47 UTC, Ali Çehreli wrote: On 12/03/2013 09:12 AM, Benji wrote: Hello, in order to have correctly displayed output (before reading something from stdin), I must call stdout.flush(). I am surprised that you need that. What is your platform? Normally, stdin and stdout are tied. Reading from stdin flushes stdout automatically. Ali I am using Xubuntu, 64bit, and GDC as compiler I've known this to be the case for cin and cout of C++. So, I've been assuming that to be universally true. Apparently not for C and D behavior is based on C. I wish std.stdio gave us C++'s 'tie'. Ali P.S. This makes some of the examples at ddili.org incorrect as I never call flush. :-/
Re: stdout - autoflushing
On Tuesday, 3 December 2013 at 20:36:22 UTC, Benji wrote: On Tuesday, 3 December 2013 at 19:33:47 UTC, Ali Çehreli wrote: On 12/03/2013 09:12 AM, Benji wrote: Hello, in order to have correctly displayed output (before reading something from stdin), I must call stdout.flush(). I am surprised that you need that. What is your platform? Normally, stdin and stdout are tied. Reading from stdin flushes stdout automatically. Ali I am using Xubuntu, 64bit, and GDC as compiler I haven't seen this behavior, though I haven't used GDC (debian is close enough right). This has been how I've retrieved user data: https://github.com/JesseKPhillips/JPDLibs/blob/cmdln/cmdln/interact.d#L60
Re: stdout - autoflushing
On Tuesday, 3 December 2013 at 20:36:22 UTC, Benji wrote: I am using Xubuntu, 64bit, and GDC as compiler Any IDE? I've seen ide consoles buffer differently because the runtime sees the target as a pipe instead of a user-interactive terminal.
