NAME

Misc::Stopwatch - Measure elapsed time

SYNOPSIS

  #!/usr/bin/perl
  use Misc::Stopwatch;
  my $sw = Misc::Stopwatch->new()->start();
  for (1 .. 3) {
    sleep 1;
    $sw->lap();
  }
  $sw->stop();
  printf "Lap 1: %f\n", $sw->elapsed(1);
  printf "Lap 2: %f\n", $sw->elapsed(2);
  printf "Lap 3: %f\n", $sw->elapsed(3);
  printf "Total: %f\n", $sw->elapsed();

Will output something like:

  Lap 1: 1.000244
  Lap 2: 2.000375
  Lap 3: 3.000527
  Total: 3.000544

EXPORTS

Nothing exported by default

DEPENDENCIES

This module requires these other modules and libraries:

    Time::HiRes

DESCRIPTION

This module provides convenient methods as expected from a stopwatch.

  start       Starts the stopwatch
  lap         Marks a lap time
  stop        Stops it
  elapsed     Returns the elapsed time
  reset       Stops if running and clears all laps
  is_running  True or False

Similar modules:

Time::Stopwatch - provides a tied interface and will work without Time::HiRes.

Benchmark::Stopwatch - is mostly identical, however does not have the elapsed method.

PUBLIC INTERFACE

new

Construct a new Misc::Stopwatch

  new

This example will not abort:

  use Misc::Stopwatch;

This example will return true:

  my $sw = Misc::Stopwatch->new();

start

Reset and Start the stopwatch

  start

Returns $self.

Note that calling this on an already-running instance will reset it.

This example will not abort:

  my $sw = Misc::Stopwatch->new()->start();

lap

Preserve the elapsed time without stopping

  lap

Returns $self.

This is is a no-op unless the stopwatch is running.

This example will not abort:

  my $sw = Misc::Stopwatch->new()->start()->lap();

stop

Stop

  stop

Returns $self.

This example will not abort:

  my $sw = Misc::Stopwatch->new()->start()->stop();

elapsed

Return the elapsed time

  elapsed $lap
  elapsed

In its second form, elapsed will return the time from start to now (or when stop was called).

undefined is returned when:

1.) $lap is provided but no such lap exists

2.) is_running returns a false value

This example will return true:

  Misc::Stopwatch->new()->start()->elapsed();

reset

Stop and clear data

  reset

Returns $self.

This example will not abort:

  my $sw = Misc::Stopwatch->new()->reset();

is_running

Boolean logic

  is_running

Returns a true value if the stopwatch has been started and has not been stopped.

This example will return false:

  Misc::Stopwatch->new()->is_running();

This example will return true:

  Misc::Stopwatch->new()->start()->is_running();

PACKAGE INTERNALS

_capture

Capture the moment

  _capture

AUTHORS

Ryan Gies <ryangies@cpan.org>

COPYRIGHT

Copyright (C) 2006-2010 by Livesite Networks, LLC. All rights reserved.

Copyright (C) 2000-2005 by Ryan Gies. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

* The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.

* Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.

* The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

To the best of our knowledge, no patented algorithms have been used. However, we do not have the resources to carry out a patent search, and therefore cannot give any guarantee of the above statement.

cpanm Misc::Stopwatch

perl -MCPAN -e shell
install Misc::Stopwatch