• ed (6/6) Mar 30 2014 Hi,
• Jonathan M Davis (15/20) Mar 30 2014 If you want an overview of std.datetime, read
• ed (4/34) Mar 30 2014 Great info, thank you.
• Marco Leise (10/18) Mar 31 2014 If you just need to time something, TickDuration from

"ed" <sillymongrel gmail.com> writes:

Hi,

Just wondering what the best replacement for C timeval is in D. 
I'm looking at std.datetime.SysTime, but std.datetime is huge so 
I'm not sure.

Thanks,
ed

Jonathan M Davis <jmdavisProg gmx.com> writes:

On Monday, March 31, 2014 05:09:22 ed wrote:
 Hi,
 
 Just wondering what the best replacement for C timeval is in D.
 I'm looking at std.datetime.SysTime, but std.datetime is huge so
 I'm not sure.

If you want an overview of std.datetime, read

http://dlang.org/intro-to-datetime.html

But yes, SysTime would be what you'd want to use instead of a timeval. SysTime 
is intended for representing the time of the system, whereas DateTime, Date, 
or TimeOfDay relate to specifically to calendar time (they have no time zones 
and therefore cannot be tied to a unique point in time - e.g. a DateTime for 
2014-03-30T12:00:00 could be one of over 24 different points in time, as it 
has no time zone to tie it down). SysTime holds its time internally in UTC and 
uses a TimeZone object to convert to to other time zones when required (e.g. 
when printing it out); it defaults to LocalTime, which represents the local 
time of your system.

SysTime also has a function called toTimeVal for converting to a timeval if 
you need to pass it to C code.

- Jonathan M Davis

"ed" <sillymongrel gmail.com> writes:

On Monday, 31 March 2014 at 06:25:40 UTC, Jonathan M Davis wrote:
 On Monday, March 31, 2014 05:09:22 ed wrote:
 Hi,
 
 Just wondering what the best replacement for C timeval is in D.
 I'm looking at std.datetime.SysTime, but std.datetime is huge 
 so
 I'm not sure.

 If you want an overview of std.datetime, read

 http://dlang.org/intro-to-datetime.html

 But yes, SysTime would be what you'd want to use instead of a 
 timeval. SysTime
 is intended for representing the time of the system, whereas 
 DateTime, Date,
 or TimeOfDay relate to specifically to calendar time (they have 
 no time zones
 and therefore cannot be tied to a unique point in time - e.g. a 
 DateTime for
 2014-03-30T12:00:00 could be one of over 24 different points in 
 time, as it
 has no time zone to tie it down). SysTime holds its time 
 internally in UTC and
 uses a TimeZone object to convert to to other time zones when 
 required (e.g.
 when printing it out); it defaults to LocalTime, which 
 represents the local
 time of your system.

 SysTime also has a function called toTimeVal for converting to 
 a timeval if
 you need to pass it to C code.

 - Jonathan M Davis

Great info, thank you.


Cheers,
ed

Marco Leise <Marco.Leise gmx.de> writes:

Am Mon, 31 Mar 2014 05:09:22 +0000
schrieb "ed" <sillymongrel gmail.com>:

 Hi,
 
 Just wondering what the best replacement for C timeval is in D. 
 I'm looking at std.datetime.SysTime, but std.datetime is huge so 
 I'm not sure.
 
 Thanks,
 ed

If you just need to time something, TickDuration from
core.time is an efficient cross-platform timer.

auto t1 = TickDuration.currentSystemTick;
...
auto t2 = TickDuration.currentSystemTick;
writefln("Took %s ms", (t2-t1).msecs);

-- 
Marco