1Type::Tiny::Manual::NonUOsOe(r3)Contributed Perl DocumenTtyaptei:o:nTiny::Manual::NonOO(3)
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NAME

6       Type::Tiny::Manual::NonOO - Type::Tiny in non-object-oriented code
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MANUAL

9       Although Type::Tiny was designed with object-oriented programming in
10       mind, especially Moose-style classes and roles, it can be used in
11       procedural and imperative programming.
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13       If you have read Type::Tiny::Manual::UsingWithMoo, you should
14       understand how Type::Params can be used to validate method parametters.
15       This same technique can be applied to regular subs too; just don't
16       "shift" off $self. More information about checking parameters can be
17       found in Type::Tiny::Manual::Params.
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19       The "is_*" and "assert_*" functions exported by type libraries may be
20       useful in non-OO code too. See Type::Tiny::Manual::UsingWithMoo3.
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22   Type::Tiny and Smart Match
23       Perl 5.10 introduced the smart match operator "~~", which has since
24       been deprecated because though the general idea is fairly sound, the
25       details were a bit messy.
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27       Nevertheless, Type::Tiny has support for smart match and I'm
28       documenting it here because there's nowhere better to put it.
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30       The following can be used as to check if a value passes a type
31       constraint:
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33         $value ~~ SomeType
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35       Where it gets weird is if $value is an object and overloads "~~".
36       Which overload of "~~" wins? I don't know.
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38       Better to use:
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40         SomeType->check( $value )   # more reliable, probably faster
41         is_SomeType($value)         # more reliable, definitely faster
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43       It's also possible to do:
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45         $value ~~ SomeType->coercion
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47       This checks to see if $value matches any type that can be coerced to
48       SomeType.
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50       But better to use:
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52         SomeType->coercion->has_coercion_for_value( $value )
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54   "given" and "when"
55       Related to the smart match operator is the "given"/"when" syntax.
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57       This will not do what you want it to do:
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59         use Types::Standard qw( Str Int );
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61         given ($value) {
62           when (Int) { ... }
63           when (Str) { ... }
64         }
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66       This will do what you wanted:
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68         use Types::Standard qw( is_Str is_Int );
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70         given ($value) {
71           when (\&is_Int) { ... }
72           when (\&is_Str) { ... }
73         }
74
75       Sorry, that's just how Perl be.
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77       Better though:
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79         use Types::Standard qw( Str Int );
80         use Type::Utils qw( match_on_type );
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82         match_on_type $value => (
83           Str, sub { ... },
84           Int, sub { ... },
85         );
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87       If this is part of a loop or other frequently called bit of code, you
88       can compile the checks once and use them many times:
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90         use Types::Standard qw( Str Int );
91         use Type::Utils qw( compile_match_on_type );
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93         my $dispatch_table = compile_match_on_type(
94           Str, sub { ... },
95           Int, sub { ... },
96         );
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98         $dispatch_table->($_) for @lots_of_values;
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100       As with most things in Type::Tiny, those coderefs can be replaced by
101       strings of Perl code.
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NEXT STEPS

104       Here's your next step:
105
106       •   Type::Tiny::Manual::Optimization
107
108           Squeeze the most out of your CPU.
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AUTHOR

111       Toby Inkster <tobyink@cpan.org>.
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114       This software is copyright (c) 2013-2014, 2017-2021 by Toby Inkster.
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116       This is free software; you can redistribute it and/or modify it under
117       the same terms as the Perl 5 programming language system itself.
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DISCLAIMER OF WARRANTIES

120       THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
121       WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
122       MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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126perl v5.32.1                      2021-04-27      Type::Tiny::Manual::NonOO(3)
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