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digitalmars.D.bugs - d_time and writefln

reply Carlos Santander <csantander619 gmail.com> writes:
d_time should be recognized by writefln.

//-------------
import std.date;
import std.stdio;

void main() {
     d_time fecha = getUTCtime();
     writefln("%s",toDateString(fecha));
     writefln(fecha);
}
//-------------

Outputs (any system):

$ ./test
Tue May 09 2006
1147138947602


-- 
Carlos Santander Bernal
May 08 2006
parent reply Chris Nicholson-Sauls <ibisbasenji gmail.com> writes:
Carlos Santander wrote:

 d_time should be recognized by writefln.
 
 //-------------
 import std.date;
 import std.stdio;
 
 void main() {
     d_time fecha = getUTCtime();
     writefln("%s",toDateString(fecha));
     writefln(fecha);
 }
 //-------------
 
 Outputs (any system):
 
 $ ./test
 Tue May 09 2006
 1147138947602
 


The problem is, that 'd_time' is just an alias of long, so writef*() just sees
it as a 
long.  Maybe d_time could be typedef'd to change this, but would that break
anything?  If 
it has no or few cons against it, I'm cool with typedef'ing it, although it
would couple 
std.format and std.date to each other a little.

-- Chris Nicholson-Sauls
May 08 2006
parent reply Stewart Gordon <smjg_1998 yahoo.com> writes:
Chris Nicholson-Sauls wrote:
<snip>

 The problem is, that 'd_time' is just an alias of long, so writef*() 
 just sees it as a long.  Maybe d_time could be typedef'd to change this, 
 but would that break anything?  If it has no or few cons against it, I'm 
 cool with typedef'ing it, although it would couple std.format and 
 std.date to each other a little.


If we have this, then we ought to have a way for the programmer to 
define a custom formatting for any typedef.

Stewart.

-- 
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My e-mail is valid but not my primary mailbox.  Please keep replies on 
the 'group where everyone may benefit.
May 09 2006
parent reply Carlos Santander <csantander619 gmail.com> writes:
Stewart Gordon escribió:

 Chris Nicholson-Sauls wrote:
 <snip>

 The problem is, that 'd_time' is just an alias of long, so writef*() 
 just sees it as a long.  Maybe d_time could be typedef'd to change 
 this, but would that break anything?  If it has no or few cons against 
 it, I'm cool with typedef'ing it, although it would couple std.format 
 and std.date to each other a little.




Another solution would be to add a bit of type information to aliases. In any 
case, if d_time is the official way to deal with dates and times in D, I 
wouldn't be surprised if many people new to D tried to do

writefln(getUTCtime());

So, regardless of the solution, I believe printing the numeric representation
is 
wrong.


 
 If we have this, then we ought to have a way for the programmer to 
 define a custom formatting for any typedef.
 


There should be a way to do this, too.


 Stewart.
 



-- 
Carlos Santander Bernal
May 09 2006
parent reply "Regan Heath" <regan netwin.co.nz> writes:
On Tue, 09 May 2006 09:47:59 -0500, Carlos Santander  
<csantander619 gmail.com> wrote:

 Stewart Gordon escribió:

 Chris Nicholson-Sauls wrote:
 <snip>

 The problem is, that 'd_time' is just an alias of long, so writef*()  
 just sees it as a long.  Maybe d_time could be typedef'd to change  
 this, but would that break anything?  If it has no or few cons against  
 it, I'm cool with typedef'ing it, although it would couple std.format  
 and std.date to each other a little.




 Another solution would be to add a bit of type information to aliases.  
 In any case, if d_time is the official way to deal with dates and times  
 in D, I wouldn't be surprised if many people new to D tried to do

 writefln(getUTCtime());

 So, regardless of the solution, I believe printing the numeric  
 representation is wrong.


It should remain possible to print the numeric representation. For use in  
files/records/etc on disk or otherwise. I use the numeric time_t value  
 from time() in C/C++ all the time. It's far easier to read/write a number  
than parse a string which could be in many different formats.

Regan
May 09 2006
parent Stewart Gordon <smjg_1998 yahoo.com> writes:
Regan Heath wrote:
<snip>

 It should remain possible to print the numeric representation. For use 
 in files/records/etc on disk or otherwise. I use the numeric time_t 
 value from time() in C/C++ all the time.


There are many different formats for converting dates/times into 
numbers.  Is the format of time_t standardised?


 It's far easier to read/write a 
 number than parse a string which could be in many different formats.


And somewhere between the two is parsing a string that can be in only 
one format.  Depending on whether you want the files your program works 
with to be human-readable, you could use either a simple numeric 
representation or a uniform textual notation (ideally the ISO notation).

Stewart.

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCS/M d- s:-  C++  a->--- UB  P+ L E  W++  N+++ o K-  w++  O? M V? PS- 
PE- Y? PGP- t- 5? X? R b DI? D G e++++ h-- r-- !y
------END GEEK CODE BLOCK------

My e-mail is valid but not my primary mailbox.  Please keep replies on 
the 'group where everyone may benefit.
May 10 2006