Sub::Infix creates fake infix operators using overloading. It doesn't
use source filters, or the Devel::Declare manpage, or any of that magic. (Though
Devel::Declare isn't magic enough to define infix operators anyway; I
know; I've tried.) It's pure Perl, has no non-core dependencies, and
runs on Perl 5.8.

The price you pay for its simplicity is that you cannot define an
operator that can be used like this:

  my $five = 2 plus 3;

Instead, the operator needs to be wrapped with real Perl operators in
one of three ways:

  my $five = 2 |plus| 3;
  my $five = 2 /plus/ 3;
  my $five = 2 <<plus>> 3;

The advantage of this is that it gives you three different levels of
operator precedence.

You can also call the function a slightly less weird way:

  my $five = plus->(2, 3);

• Igor Vlasenko

• perl-Sub-Infix