Type::Tiny::Manual::NonOO - phpMan

Type::Tiny::Manual::NonOO(3pm) User Contributed Perl Documentation Type::Tiny::Manual::NonOO(3pm)

NAME
       Type::Tiny::Manual::NonOO - Type::Tiny in non-object-oriented code

MANUAL
       Although Type::Tiny was designed with object-oriented programming in mind, especially
       Moose-style classes and roles, it can be used in procedural and imperative programming.

       If you have read Type::Tiny::Manual::UsingWithMoo, you should understand how Type::Params
       can be used to validate method parametters. This same technique can be applied to regular
       subs too; just don't "shift" off $self. More information about checking parameters can be
       found in Type::Tiny::Manual::Params.

       The "is_*" and "assert_*" functions exported by type libraries may be useful in non-OO
       code too. See Type::Tiny::Manual::UsingWithMoo3.

   Type::Tiny and Smart Match
       Perl 5.10 introduced the smart match operator "~~", which has since been deprecated
       because though the general idea is fairly sound, the details were a bit messy.

       Nevertheless, Type::Tiny has support for smart match and I'm documenting it here because
       there's nowhere better to put it.

       The following can be used as to check if a value passes a type constraint:

         $value ~~ SomeType

       Where it gets weird is if $value is an object and overloads "~~".  Which overload of "~~"
       wins? I don't know.

       Better to use:

         SomeType->check( $value )   # more reliable, probably faster
         is_SomeType($value)         # more reliable, definitely faster

       It's also possible to do:

         $value ~~ SomeType->coercion

       This checks to see if $value matches any type that can be coerced to SomeType.

       But better to use:

         SomeType->coercion->has_coercion_for_value( $value )

   "given" and "when"
       Related to the smart match operator is the "given"/"when" syntax.

       This will not do what you want it to do:

         use Types::Standard qw( Str Int );

         given ($value) {
           when (Int) { ... }
           when (Str) { ... }
         }

       This will do what you wanted:

         use Types::Standard qw( is_Str is_Int );

         given ($value) {
           when (\&is_Int) { ... }
           when (\&is_Str) { ... }
         }

       Sorry, that's just how Perl be.

       Better though:

         use Types::Standard qw( Str Int );
         use Type::Utils qw( match_on_type );

         match_on_type $value => (
           Str, sub { ... },
           Int, sub { ... },
         );

       If this is part of a loop or other frequently called bit of code, you can compile the
       checks once and use them many times:

         use Types::Standard qw( Str Int );
         use Type::Utils qw( compile_match_on_type );

         my $dispatch_table = compile_match_on_type(
           Str, sub { ... },
           Int, sub { ... },
         );

         $dispatch_table->($_) for @lots_of_values;

       As with most things in Type::Tiny, those coderefs can be replaced by strings of Perl code.

NEXT STEPS
       Here's your next step:

       o   Type::Tiny::Manual::Optimization

           Squeeze the most out of your CPU.

AUTHOR
       Toby Inkster <tobyink AT cpan.org>.

COPYRIGHT AND LICENCE
       This software is copyright (c) 2013-2014, 2017-2019 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.

perl v5.30.0                                2019-12-28             Type::Tiny::Manual::NonOO(3pm)

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