1Method::Signatures::SimUpsleer(3C)ontributed Perl DocumeMnettahtoido:n:Signatures::Simple(3)
2
6 Method::Signatures::Simple - Basic method declarations with signatures,
7 without source filters
8
10 version 1.07
11
13 # -- a basic class -- #
14 package User;
15 use Method::Signatures::Simple;
16 method new ($class: $name, $email) {
18 my $user = {
19 id => new_id(42),
20 name => $name,
21 email => $email,
22 };
23 bless $user, $class;
24 }
25 func new_id ($seed) {
27 state $id = $seed;
28 $id++;
29 }
30 method name { $self->{name}; }
32 method email { $self->{email}; }
33 1;
34 # -- other features -- #
37 # attributes
38 method foo : lvalue { $self->{foo} }
39 # change invocant name
41 use Method::Signatures::Simple invocant => '$this';
42 method foo ($bar) { $this->bar($bar) }
43 method bar ($class: $bar) { $class->baz($bar) }
44 # use a different function keyword
46 use Method::Signatures::Simple function_keyword => 'fun';
47 fun triple ($num) { 3 * $num }
48 # use a different method keyword
50 use Method::Signatures::Simple method_keyword => 'action';
51 action foo { $self->bar }
52
54 This module provides basic "method" and "func" keywords with simple
55 signatures. It's intentionally simple, and is supposed to be a stepping
56 stone for its bigger brothers MooseX::Method::Signatures and
57 Method::Signatures. It only has a small benefit over regular subs, so
58 if you want more features, look at those modules. But if you're
59 looking for a small amount of syntactic sugar, this might just be
60 enough.
61
63 • invocant
64 The "method" keyword automatically injects the annoying "my $self =
66 shift;" for you. You can rename the invocant with the first
67 argument, followed by a colon:
68 method ($this:) {}
70 method ($this: $that) {}
71 The "func" keyword doesn't inject an invocant, but does do the
73 signature processing below:
74 func ($that) {}
76 • signature
78 The signature "($sig)" is transformed into "my ($sig) = \@_;". That
80 way, we mimic perl's usual argument handling.
81 method foo ($bar, $baz, %opts) {
83 func xyzzy ($plugh, @zorkmid) {
84 # becomes
86 sub foo {
88 my $self = shift;
89 my ($bar, $baz, %opts) = @_;
90 sub xyzzy {
92 my ($plugh, @zorkmid) = @_;
93
95 Since this module subclasses Devel::Declare::MethodInstaller::Simple,
96 you can change the keywords and the default invocant with import
97 arguments. These changes affect the current scope.
98 • change the invocant name
100 use Method::Signatures::Simple invocant => '$this';
102 method x { $this->{x} }
103 method y { $this->{y} }
104 # and this of course still works:
106 method z ($self:) { $self->{z} }
107 • change the keywords
109 You can install a different keyword (instead of the default
111 'method' and 'func'), by passing names to the "use" line:
112 use Method::Signatures::Simple method_keyword => 'action',
114 function_keyword => 'thing';
115 action foo ($some, $args) { ... }
117 thing bar ($whatever) { ... }
118 One benefit of this is that you can use this module together with
120 e.g. MooseX::Declare:
121 # untested
123 use MooseX::Declare;
124 class Foo {
126 use Method::Signatures::Simple method_keyword => 'routine';
127 method x (Int $x) { ... } # from MooseX::Method::Signatures
128 routine y ($y) { ... } # from this module
129 }
130 If you specify neither "method_keyword" nor "function_keyword",
132 then we default to injecting "method" and "func". If you only
133 specify one of these options, then we only inject that one keyword
134 into your scope.
135 Examples:
137 # injects 'method' and 'func'
139 use Method::Signatures::Simple;
140 # only injects 'action'
142 use Method::Signatures::Simple method_keyword => 'action';
143 # only injects 'procedure'
145 use Method::Signatures::Simple function_keyword => 'procedure';
146 # injects 'action' and 'function'
148 use Method::Signatures::Simple method_keyword => 'action',
149 function_keyword => 'function';
150 • install several keywords
152 You're not limited to a single "use" line, so you can install
154 several keywords with the same semantics as 'method' into the
155 current scope:
156 use Method::Signatures::Simple; # provides 'method' and 'func'
158 use Method::Signatures::Simple method_keyword => 'action';
159 method x { ... }
161 func y { ... }
162 action z { ... }
163
165 Rhesa Rozendaal, "<rhesa at cpan.org>"
166
168 Please report any bugs or feature requests to
169 "bug-method-signatures-simple at rt.cpan.org", or through the web
170 interface at
171 <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Method-Signatures-Simple>.
172 I will be notified, and then you'll automatically be notified of
173 progress on your bug as I make changes.
174
176 You can find documentation for this module with the perldoc command.
177 perldoc Method::Signatures::Simple
179 You can also look for information at:
181 • RT: CPAN's request tracker
183 <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Method-Signatures-Simple>
185 • AnnoCPAN: Annotated CPAN documentation
187 <http://annocpan.org/dist/Method-Signatures-Simple>
189 • CPAN Ratings
191 <http://cpanratings.perl.org/d/Method-Signatures-Simple>
193 • Search CPAN
195 <http://search.cpan.org/dist/Method-Signatures-Simple>
197
199 • MSTROUT
200 For writing Devel::Declare and providing the core concepts.
202 • MSCHWERN
204 For writing Method::Signatures and publishing about it. This is
206 what got my attention.
207 • FLORA
209 For helping me abstracting the Devel::Declare bits and suggesting
211 improvements.
212 • CHIPS
214 For suggesting we add a 'func' keyword.
216
218 Devel::Declare, Method::Signatures, MooseX::Method::Signatures.
219
221 Copyright 2011 Rhesa Rozendaal, all rights reserved.
222 This program is free software; you can redistribute it and/or modify it
224 under the same terms as Perl itself.
225perl v5.32.1 2021-01-27 Method::Signatures::Simple(3)