1Specio::Constraint::StrUuscetrurCaobnlter(i3b)uted PerlSDpoeccuimoe:n:tCaotnisotnraint::Structurable(3)
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NAME

6       Specio::Constraint::Structurable - A class which represents
7       structurable constraints
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VERSION

10       version 0.42
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SYNOPSIS

13           my $tuple = t('Tuple');
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15           my $tuple_of_str_int = $tuple->parameterize( of => [ t('Str'), t('Int') ] );
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DESCRIPTION

18       This class implements the API for structurable types like "Dict",
19       "Map"< and "Tuple".
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API

22       This class implements the same API as Specio::Constraint::Simple, with
23       a few additions.
24
25   Specio::Constraint::Structurable->new(...)
26       This class's constructor accepts two additional parameters:
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28       ·   parameterization_args_builder
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30           This is a subroutine that takes the values passed to "of" and
31           returns a hash of named arguments. These arguments will then be
32           passed into the "structured_constraint_generator" or
33           "structured_inline_generator".
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35           This should also do argument checking to make sure that the
36           argument passed are valid. For example, the "Tuple" type turns the
37           arrayref passed to "of" into a hash, along the way checking that
38           the caller did not do things like interleave optional and required
39           elements or mix optional and slurpy together in the definition.
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41           This parameter is required.
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43       ·   name_builder
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45           This is a subroutine that is called to generate a name for the
46           structured type when it is created. This will be called as a method
47           on the "Specio::Constraint::Structurable" object. It will be passed
48           the hash of arguments returned by the
49           "parameterization_args_builder".
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51           This parameter is required.
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53       ·   structured_constraint_generator
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55           This is a subroutine that generates a new constraint subroutine
56           when the type is structured.
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58           It will be called as a method on the type and will be passed the
59           hash of arguments returned by the "parameterization_args_builder".
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61           This parameter is mutually exclusive with the
62           "structured_inline_generator" parameter.
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64           This parameter or the "structured_inline_generator" parameter is
65           required.
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67       ·   structured_inline_generator
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69           This is a subroutine that generates a new inline generator
70           subroutine when the type is structured.
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72           It will be called as a method on the Specio::Constraint::Structured
73           object when that object needs to generate an inline constraint. It
74           will receive the type parameter as the first argument and the
75           variable name as a string as the second.
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77           The remaining arguments will be the parameter hash returned by the
78           "parameterization_args_builder".
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80           This probably seems fairly confusing, so looking at the examples in
81           the Specio::Library::Structured::* code may be helpful.
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83           This parameter is mutually exclusive with the
84           "structured_constraint_generator" parameter.
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86           This parameter or the "structured_constraint_generator" parameter
87           is required.
88
89   $type->parameterize(...)
90       This method takes two arguments. The "of" argument should be an object
91       which does the Specio::Constraint::Role::Interface role, and is
92       required.
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94       The other argument, "declared_at", is optional. If it is not given,
95       then a new Specio::DeclaredAt object is creating using a call stack
96       depth of 1.
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98       This method returns a new Specio::Constraint::Structured object.
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SUPPORT

101       Bugs may be submitted at
102       <https://github.com/houseabsolute/Specio/issues>.
103
104       I am also usually active on IRC as 'autarch' on "irc://irc.perl.org".
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SOURCE

107       The source code repository for Specio can be found at
108       <https://github.com/houseabsolute/Specio>.
109

AUTHOR

111       Dave Rolsky <autarch@urth.org>
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114       This software is Copyright (c) 2012 - 2017 by Dave Rolsky.
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116       This is free software, licensed under:
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118         The Artistic License 2.0 (GPL Compatible)
119
120       The full text of the license can be found in the LICENSE file included
121       with this distribution.
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125perl v5.28.0                      2017-11-04Specio::Constraint::Structurable(3)
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