If you want to check if it uses 32-bit integers or 64-bit integers, use the following: perl -V:ivsize # use Config; say $Config{ivsize} If the returned value is 4, your Perl uses 32-bit integers. If the returned value is 8, your Perl uses 64-bit integers. See also: Answer to “What is the perl equivalent of … Read more
Starting from Perl 5.8.1 map in void context is not expensive: map in void context is no longer expensive. map is now context aware, and will not construct a list if called in void context. But the postfix form of for may be more readable: perform_action($_) for @items;
I should note that the article you referenced is old, and that you should now use Exception::Class instead of Error.pm, which is quirky and tends to break (it’s what I call “black magick”). I should note that I am now the Error.pm maintainer, but I no longer recommend it or make use of it for … Read more
The new, cool way to handle this is with Capture::Tiny. You can use it surgically to affect just the part of the program where you need it without disturbing anything else. But, I’d probably do what cjm recommends since that doesn’t require a module.
At first you need to do the correct subtraction. There exists delta_md, delta_days, delta_ms and subtract_datetime_absolute. Depending on which unit you later want, you need to pick the right subtraction. The problem is that not every unit is convertible later without time_zone information. Thats the reason why you need to pick the correct delta method. … Read more
The FAQ which ships with Perl has the answer to this question. If you run perldoc -q “screen size”, you’ll get the following: How do I get the screen size? If you have Term::ReadKey module installed from CPAN, you can use it to fetch the width and height in characters and in pixels: use Term::ReadKey; … Read more
The idea is that those three lines do 3 different things if they’re evaluated in a standard Bourne shell (sh), a C shell (csh), or Perl. This hack is only needed on systems that don’t support specifying an interpreter name using a #! line at the start of a script. If you execute a Perl … Read more
The real issue has nothing to do with sleep, but rather that………… You are Suffering from Buffering. The link provided takes you to an excellent article from The Perl Journal circa 1998 from Marc Jason Dominus (the author of Higher-Order Perl). The article may be over a decade old, but the topic is as relevant … Read more
Each of the standard build paradigms has their own way of specifying dependencies. In all of these cases, the build process will attempt to install your dependencies, automatically in some contexts. In ExtUtils::MakeMaker, you pass a hash reference in the PREREQ_PM field to WriteMakefile: # Makefile.PL for My::Module use ExtUtils::MakeMaker; WriteMakefile ( NAME => ‘My::Module’, … Read more
Outside data sources are tricky in Perl. For command-line arguments, you’re probably getting them as the encoding specified in your locale. Don’t rely on your locale to be the same as someone else who might run your program. You have to find out what that is then convert to Perl’s internal format. Fortunately, it’s not … Read more