1oo::util(n) Utility commands for TclOO oo::util(n)
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6
8 oo::util - Utility commands for TclOO
9
11 package require Tcl 8.5
12 package require TclOO
14 package require oo::util ?1.2.2?
16 mymethod method ?arg...?
18 classmethod name arguments body
20 classvariable ?arg...?
22 link method...
24 link {alias method}...
26 ooutil::singleton ?arg...?
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30
32 This package provides a convenience command for the easy specification
33 of instance methods as callback commands, like timers, file events, Tk
34 bindings, etc.
35
37 mymethod method ?arg...?
38 This command is available within instance methods. It takes a
39 method name and, possibly, arguments for the method and returns
40 a command prefix which, when executed, will invoke the named
41 method of the object we are in, with the provided arguments, and
42 any others supplied at the time of actual invokation.
43 Note: The command is equivalent to and named after the command
45 provided by the OO package snit for the same purpose.
46 classmethod name arguments body
48 This command is available within class definitions. It takes a
49 method name and, possibly, arguments for the method and creates
50 a method on the class, available to a user of the class and of
51 derived classes.
52 Note: The command is equivalent to the command typemethod pro‐
54 vided by the OO package snit for the same purpose.
55 Example
57 oo::class create ActiveRecord {
60 classmethod find args { puts "[self] called with arguments: $args" }
61 }
62 oo::class create Table {
63 superclass ActiveRecord
64 }
65 puts [Table find foo bar]
66 # ======
67 # which will write
68 # ======
69 # ::Table called with arguments: foo bar
70 classvariable ?arg...?
73 This command is available within instance methods. It takes a
74 series of variable names and makes them available in the
75 method's scope. The originating scope for the variables is the
76 class (instance) the object instance belongs to. In other words,
77 the referenced variables are shared between all instances of
78 their class.
79 Note: The command is roughly equivalent to the command typevari‐
81 able provided by the OO package snit for the same purpose. The
82 difference is that it cannot be used in the class definition
83 itself.
84 Example:
86 % oo::class create Foo {
89 method bar {z} {
90 classvariable x y
91 return [incr x $z],[incr y]
92 }
93 }
94 ::Foo
95 % Foo create a
96 ::a
97 % Foo create b
98 ::b
99 % a bar 2
100 2,1
101 % a bar 3
102 5,2
103 % b bar 7
104 12,3
105 % b bar -1
106 11,4
107 % a bar 0
108 11,5
109 link method...
112 link {alias method}...
114 This command is available within instance methods. It takes a
115 list of method names and/or pairs of alias- and method-name and
116 makes the named methods available to all instance methods with‐
117 out requiring the my command.
118 The alias name under which the method becomes available defaults
120 to the method name, except where explicitly specified through an
121 alias/method pair.
122 Examples:
124 link foo
127 # The method foo is now directly accessible as foo instead of my foo.
128 link {bar foo}
130 # The method foo is now directly accessible as bar.
131 link a b c
133 # The methods a, b, and c all become directly acessible under their
134 # own names.
135 The main use of this command is expected to be in instance con‐
138 structors, for convenience, or to set up some methods for use in
139 a mini DSL.
140 ooutil::singleton ?arg...?
142 This command is a meta-class, i.e. a variant of the builtin
143 oo::class which ensures that it creates only a single instance
144 of the classes defined with it.
145 Syntax and results are like for oo::class.
147 Example:
149 % oo::class create example {
152 self mixin singleton
153 method foo {} {self}
154 }
155 ::example
156 % [example new] foo
157 ::oo::Obj22
158 % [example new] foo
159 ::oo::Obj22
160
163 Donal Fellows, Andreas Kupries
164
166 This document, and the package it describes, will undoubtedly contain
167 bugs and other problems. Please report such in the category oo::util
168 of the Tcllib Trackers [http://core.tcl.tk/tcllib/reportlist]. Please
169 also report any ideas for enhancements you may have for either package
170 and/or documentation.
171 When proposing code changes, please provide unified diffs, i.e the out‐
173 put of diff -u.
174 Note further that attachments are strongly preferred over inlined
176 patches. Attachments can be made by going to the Edit form of the
177 ticket immediately after its creation, and then using the left-most
178 button in the secondary navigation bar.
179
181 snit(n)
182
184 TclOO, callback, class methods, class variables, command prefix, curry‐
185 ing, method reference, my method, singleton
186
188 Utility
189
191 Copyright (c) 2011-2015 Andreas Kupries, BSD licensed
192tcllib 1.2.2 oo::util(n)