cedric-vincent

class C { has $.value; method succ { !!! } };

my C $x .= new(value => 2);
my C $y .= new(value => 4);
my C $z .= new(value => 3);

multi sub infix:<cmp> (C:D $a, C:D $b) { 'debug'.say; $a.value cmp $b.value }

say ?( $x cmp $y );
say ?( $z ~~ $x .. $y );

cedric-vincent

role R { };

my $x = 4 but R;
my $y = 2 but R;

multi sub foo ($a, $b) { say "foo without constraint" }

multi sub foo ($a where { .defined and .does(R) },
               $b where { .defined and .does(R) }) {
    say "foo with constraints"

cedric-vincent

=begin POD

=head1 Whatever the layout manager is

=head2 Introduction

This article aims to demonstrate how C<Whatever> -- one of the many
interesting Perl 6 curiosities -- could be useful to easily implement
and use complex things like a layout manager.  In a couple of words, a
layout manager is the part of a graphical interface in charge of the

cedric-vincent

class Class { has $.attr;  method attr() { !!! } }; Class.new(:attr(1));