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digitalmars.D.learn - StopWatch

reply Shriramana Sharma <samjnaa_dont_spam_me gmail.com> writes:
http://dlang.org/phobos/std_datetime.html#StopWatch shows the use of 
TickDuration to measure the time elapsed, but 
http://dlang.org/phobos/core_time.html#TickDuration says TickDuration is due 
to be deprecated and MonoTime should be used. It is possible to measure the 
duration between two points of one's program using MonoTime.currTime whose 
unit is Duration.

1) Will then StopWatch be modified to use MonoTime?
2) Is StopWatch still useful?
3) Or should it also be deprecated?

--
Oct 20 2015
next sibling parent Jonathan M Davis via Digitalmars-d-learn writes:
On Tuesday, October 20, 2015 13:18:12 Shriramana Sharma via Digitalmars-d-learn
wrote:

 http://dlang.org/phobos/std_datetime.html#StopWatch shows the use of
 TickDuration to measure the time elapsed, but
 http://dlang.org/phobos/core_time.html#TickDuration says TickDuration is due
 to be deprecated and MonoTime should be used. It is possible to measure the
 duration between two points of one's program using MonoTime.currTime whose
 unit is Duration.

 1) Will then StopWatch be modified to use MonoTime?
 2) Is StopWatch still useful?
 3) Or should it also be deprecated?


There's currently a PR open to replace StopWatch with another one which
uses Duration and MonoTime instead of TickDuration:

https://github.com/D-Programming-Language/phobos/pull/3695

So, std.datetime.StopWatch is going to be deprecated as will every function
in druntime or Phobos which uses TickDuration in its public API. They'll be
replaced with functions that use MonoTime and Duration.

That being said, unless you need to stop measuring the time and start from
where you left off, StopWatch isn't necessary. If all you want to do is
measure how long something takes, MonoTime is plenty. e.g.

auto before = MonoTime.currTime;
// do stuff
auto diff = MonoTime.currTime - before;

The value of StopWatch is entirely in the fact that it can be stopped and
started again and measure the total time that it's running rather than just
measure the time between two points.

- Jonathan M Davis
Oct 20 2015
prev sibling next sibling parent Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
On Tue, 2015-10-20 at 02:19 -0700, Jonathan M Davis via Digitalmars-d-
learn wrote:

 [=E2=80=A6]
=20
 auto before =3D MonoTime.currTime;
 // do stuff
 auto diff =3D MonoTime.currTime - before;


What import statement do you use to get MonoTime. =C2=A0I tried the above
and got an error with all the things I tried.

--=20
Russel.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Oct 20 2015
prev sibling parent Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
On Tue, 2015-10-20 at 15:16 +0100, Russel Winder wrote:

=20


[=E2=80=A6]

 What import statement do you use to get MonoTime. =C2=A0I tried the above
 and got an error with all the things I tried.


Hummm=E2=80=A6 I am now not worried about the import, I tried compiling a
different way and it worked. The upshot is that I have had two
installations of LDC which are mutually incompatible re core.time and
the configuration leads to total wrongness.

Forget I ever mumbled on this topic=E2=80=A6 =C2=A0:-)
=C2=A0
--=20
Russel.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Oct 20 2015