use MooseX::Declare;

class Foo {
    use feature qw(say);

    use Data::Dumper;

    use MooseX::MultiMethods;
    use MooseX::Types -declare => [qw(Bar MyStr MyNum)];
    use MooseX::Types::Moose qw(Str Num);
    use MooseX::Types::Structured qw(Dict);

    BEGIN {
        subtype MyStr,
            as Str;
        subtype MyNum,
            as Num;

        subtype Bar,
            as Dict[
                string => MyStr,
                number => MyNum,
            ],
            message { 'Invalid Foo struct' };
    };

    multi method baz(Bar $barrr) {
        say'Bar';
        say Dumper $barrr
    }

    multi method baz(Str $string) {
        say 'Str';
        say Dumper $string;
    }
}

no Moose;
no MooseX::Declare;

1;

package main;

my $foo = Foo->new;
$foo->baz( { string => 'hello', number => 1.00, } );
$foo->baz( 'hello world' )
[download]

Thanks. My problem is i'm missing MooseX::Declare because Devel-Declare-0.005007 won't compile on windows, sorry :)

You should put your MooseX-Types library into a separate file. The method signatures are parsed at compile time, and if they are defined in the same package, they are not declared yet.

---

Ordinary morality is for ordinary people. -- Aleister Crowley

Yes, as some anonymous monk said above, that's why I put types declaration into BEGIN block (inlined for brevity). In real code these declarations are in a separate file.

That is why BEGIN{} blocks were invented :)

BEGIN {
    use MooseX::Declare;

    class Foo {
        use feature qw(say);

        use Data::Dumper;

        use MooseX::MultiMethods;
        use MooseX::Types -declare => [qw(Bar MyStr MyNum)];
        use MooseX::Types::Moose qw(Str Num);
        use MooseX::Types::Structured qw(Dict);

        BEGIN {
            subtype MyStr,
                as Str;
            subtype MyNum,
                as Num;

            subtype Bar,
                as Dict[
                    string => MyStr,
                    number => MyNum,
                ],
                message { 'Invalid Foo struct' };
        };

        multi method baz(Bar $barrr) {
            say'Bar';
            say Dumper $barrr
        }

        multi method baz(Str $string) {
            say 'Str';
            say Dumper $string;
        }
    }

}
no Moose;
no MooseX::Declare;

1;

package main;

my $foo = Foo->new;
$foo->baz( { string => 'hello', number => 1.00, } );
$foo->baz( 'hello world' )
[download]