Object Oriented Perl

contents
foreword xi
preface xii
acknowledgments xviii
author online xx
1 What you need to know first (an object-orientation primer) 1
1.1 The essentials of object orientation 2
1.2 Other object-oriented concepts 13
1.3 Terminology: a few (too many) words 18
1.4 Where to find out more 18
1.5 Summary 20
2 What you need to know second (a Perl refresher) 21
2.1 Essential Perl 21
2.2 Non-essential (but very useful) Perl 51
2.3 The CPAN 65
2.4 Where to find out more 68
2.5 Summary 72
3 Getting started 73
3.1 Three little rules 73
3.2 A simple Perl class 80
3.3 Making life easier 89
3.4 The creation and destruction of objects 96
3.5 The CD::Music class, compleat 114
3.6 Summary 117
4 Blessing arrays and scalars 118
4.1 What’s wrong with a hash? 118
4.2 Blessing an array 119
4.3 Blessing a pseudo-hash 126
4.4 Blessing a scalar 135
4.5 Summary 142
5 Blessing other things 143
5.1 Blessing a regular expression 143
5.2 Blessing a subroutine 151
5.3 Blessing a typeglob 158
5.4 Summary 166
6 Inheritance 168
6.1 How Perl handles inheritance 168
6.2 Tricks and traps 178
6.3 Example: Inheriting the CD class 193
6.4 Where to find out more 201
6.5 Summary 202
7 Polymorphism 203
7.1 Polymorphism in Perl 203
7.2 Example: Polymorphic methods for the Lexer class 205
7.3 The simple pretty-printer objectified 208
7.4 Using interface polymorphism instead 210
7.5 Where to find out more 212
7.6 Summary 212
8 Automating class creation 213
8.1 The Class::Struct module 213
8.2 The Class::MethodMaker module 222
8.3 Where to find out more 234
8.4 Summary 235
9 Ties 236
9.1 A jacketing tie required 236
9.2 Tie-ing a scalar 238
9.3 Tie-ing a hash 243
9.4 Tie-ing an array 249
9.5 Tie-ing a filehandle 256
9.6 Inheriting from a tie’able package 262
9.7 Tied variables as objects 265
9.8 Where to find out more 274
9.9 Summary 275
10 Operator overloading 276
10.1 The problem 276
10.2 Perl’s operator overloading mechanism 278
10.3 Example: A Roman numerals class 284
10.4 Circumventing undesired reference semantics 291
10.5 The use and abuse of operators 292
10.6 Where to find out more 295
10.7 Summary 295
11 Encapsulation 296
11.1 The perils of trust 296
11.2 Encapsulation via closures 297
11.3 Encapsulation via scalars 302
11.4 Encapsulation via ties 309
11.5 Where to find out more 326
11.6 Summary 326
12 Genericity 327
12.1 Why Perl doesn’t need special generic mechanisms 327
12.2 Using specific mechanisms anyway 329
12.3 Implicit generics via polymorphism 336
12.4 Where to find out more 350
12.5 Summary 350
13 Multiple dispatch 351
13.1 What is multiple dispatch? 351
13.2 Multiple dispatch via single dispatch and cases 353
13.3 Multiple dispatch via a table 356
13.4 Comparing the two approaches 361
13.5 Dynamic dispatch tables 363
13.6 Some lingering difficulties 367
13.7 The Class::Multimethods module 367
13.8 Comparing the three approaches 385
13.9 Where to find out more 385
13.10 Summary 385
14 Persistent objects 387
14.1 The ingredients 387
14.2 Object-oriented persistence 398
14.3 Coarse-grained persistence 400
14.4 Fine-grained persistence 412
14.5 Where to find out more 427
14.6 Summary 428
A Quick reference guide 429
B What you might know instead 438
B.1 Perl and Smalltalk 438
B.2 Perl and C++ 443
B.3 Perl and Java 449
B.4 Perl and Eiffel 454
glossary 459
bibliography 466
index 468

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