#PERL VERSION CODE#

Compare with require, which can do a similar check at run time. An exception is raised if VERSION is greater than the version of the current Perl interpreter Perl will not attempt to parse the rest of the file. VERSION may be either a v-string such as v5.24.1, which will be compared to $^V (aka $PERL_VERSION), or a numeric argument of the form 5.024001, which will be compared to $]. Lexically enables all features available in the requested version as defined by the feature pragma, disabling any features not in the requested version's feature bundle. See perlrun for the -M and -m command-line options to Perl that give use functionality from the command-line. See perlmodlib for a list of standard modules and pragmas. It behaves just as import does with VERSION, an omitted or empty LIST, or no unimport method being found. There's a corresponding no declaration that unimports meanings imported by use, i.e., it calls Module->unimport(LIST) instead of import. If a module or pragma only needs to be loaded conditionally, this can be done using the if pragma: use if $] qw(all) In particular, putting a use inside the false branch of a conditional doesn't prevent it from being processed.

#PERL VERSION CODE#

Some of these pseudo-modules import semantics into the current block scope (like strict or integer, unlike ordinary modules, which import symbols into the current package (which are effective through the end of the file).īecause use takes effect at compile time, it doesn't respect the ordinary flow control of the code being compiled. Some of the currently implemented pragmas are: use constant Note that there is no comma after VERSION!īecause this is a wide-open interface, pragmas (compiler directives) are also implemented this way. Nevertheless, many attempts to use an arbitrary expression as a VERSION argument will appear to work, because Exporter's import method handles numeric arguments specially, performing version checks rather than treating them as things to export.Īgain, there is a distinction between omitting LIST ( import called with no arguments) and an explicit empty LIST () ( import not called). Anything that doesn't look like a version literal will be parsed as the start of the LIST. It only counts as a VERSION argument if it is a version number literal, starting with either a digit or v followed by a digit. The VERSION argument cannot be an arbitrary expression. The default VERSION method, inherited from the UNIVERSAL class, croaks if the given version is larger than the value of the variable $Module::VERSION.

Imports some semantics into the current package from the named module, generally by aliasing certain subroutine or variable names into your package. You can use the Mojolicious framework to create web applications of any size.# use Module VERSION LIST # use Module VERSION # use Module LIST # use Module Then you can use any modules you have installed. You can add ~/perl5 to Perl's module include path by adding the following line at the top of your script: use local::lib $ echo 'eval `perl -I ~/perl5/lib/perl5 -Mlocal::lib`' > ~/.profile You can set up a module environment in ~/perl5 with: $ eval `perl -I ~/perl5/lib/perl5 -Mlocal::lib` SAA will assist upon request if header files or required libraries Valid version choices are default, any of the versions listed in the tableĪbove, or newest (which provides the newest available on the system). silk.ini file (for example ~/and adding the If you need to switch Perl versions, you can do so by creating or editing You can choose among multiple versions of Perl: Perl version pl will be executed within a Perl CGI handler.