NAME

       Sub::Infix - create a fake infix operator

SYNOPSIS

          use Sub::Infix;

          # Operator needs to be defined (or imported) at compile time.
          BEGIN { *plus = infix { $_[0] + $_[1] } };

          my $five = 2 |plus| 3;

DESCRIPTION

       Sub::Infix creates fake infix operators using overloading. It doesn't use source filters,
       or Devel::Declare, 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);

   How does it work?
       "2 |plus| 3" is parsed by perl as: "2 | ( &plus() | 3 )".

       "&plus()" returns an object that overloads the "|" operator; let's call that $obj.

       The overloaded "$obj | 3" operation stashes 3 inside $obj noting that the number is the
       right operand, and returns $obj.

       Then "2 | $obj" is evaluated, stashing 2 inside $obj as the left operand. At this point,
       the object notices that it has both operands, and calls the coderef from the definition of
       the operator, passing it both operands.

BUGS

       Please report any bugs to <http://rt.cpan.org/Dist/Display.html?Queue=Sub-Infix>.

SEE ALSO

       <http://code.activestate.com/recipes/384122-infix-operators/>.

AUTHOR

       Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

       This software is copyright (c) 2013 by Toby Inkster.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES

       THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
       WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
       PURPOSE.