Sub::Defer - defer generation of subroutines until they are first called
use Sub::Defer; my $deferred = defer_sub 'Logger::time_since_first_log' => sub { my $t = time; sub { time - $t }; }; Logger->time_since_first_log; # returns 0 and replaces itself Logger->time_since_first_log; # returns time - $t
These subroutines provide the user with a convenient way to defer creation of subroutines and methods until they are first called.
my $coderef = defer_sub $name => sub { ... };
This subroutine returns a coderef that encapsulates the provided sub - when it is first called, the provided sub is called and is -itself- expected to return a subroutine which will be goto'ed to on subsequent calls.
If a name is provided, this also installs the sub as that name - and when the subroutine is undeferred will re-install the final version for speed.
my $coderef = undefer_sub \&Foo::name;
If the passed coderef has been deferred this will "undefer" it. If the passed coderef has not been deferred, this will just return it.
If this is confusing, take a look at the example in the "SYNOPSIS".
undefer_all();
This will undefer all defered subs in one go. This can be very useful in a forking environment where child processes would each have to undefer the same subs. By calling this just before you start forking children you can undefer all currently deferred subs in the parent so that the children do not have to do it.
See Moo for support and contact information.
See Moo for authors.
See Moo for the copyright and license.
To install Moo, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Moo
CPAN shell
perl -MCPAN -e shell install Moo
For more information on module installation, please visit the detailed CPAN module installation guide.