Names of design patterns appear in small capitals: e.g., ADAPTER. Page numbers in bold indicate the definition of a term. Numbers in italics indicate a diagram for the term. Letters after a diagram's page number indicate the kind of diagram: a "c" denotes a class diagram, an "i" denotes an interaction diagram, and an "o" denotes an object diagram. For example, 88co means that a class and object diagram appears on page 88.

I

IconWindow 53, 54c, 151-152, 151c, 157

Image 207o, 208c, 213

ImagePROXY 207o, 208c

Implementor

participant of BRIDGE 153c, 154

implicit receiver, see receiver, implicit

incremental changes 287

inheritance 15, 360

C++, defined in 17

class versus interface 16

combined with polymorphism 18

compared with object composition 18 178

compared with parameterized types 21

dynamic 309

Eiffel, defined in 17

implementation 17, 360

interface 17,

mixin, see mixin class

notation for 15, 364, 365c

proper use of 18

reuse through 18

Smalltalk, defined in 17

inorder traversal, see traversal, inorder

instance, see also class, instance

ensuring uniqueness, see Singleton

variable 15, 360

instantiation 15

abstracting process of 48

notation for 15, 364, 365c

integrated circuit 323

interaction diagram 7, 366

in Builder 99i

in CHAIN OF RESPONSIBILITY 224i, 348i

in COMMAND 237i, 347i

in MEDIATOR 274i, 348i

in MEMENTO 286i

in OBSERVER 295i, 347i

in VISITOR 335i

Lexi's VISITOR 74i

interface 13

benefits of programming to 18

bloat 257

conversion, see ADAPTER

for iteration 262

inheritance 13, 17

narrow versus wide in MEMENTO 285

specifying in C++ 17

simplifying subsystems, see Facade

internal iterator, see iterator, internal

Interpreter 243

combined with Composite 255

combined with VISITOR 247, 255

in catalog summary 9

InterViews

use of ABSTRACT FACTORY 95

use of ADAPTER 148

use of COMMAND 242

use of Composite 172

use of DECORATOR 182

use of Flyweight 205

use of OBSERVER 303

use of Singleton 133

use of Strategy 320,

intrinsic state, see state, intrinsic

inversion of control flow 27

invitation 358

Invoker

participant of COMMAND 236, 236c, 237i, 347i

IRIS Inventor

use of VISITOR 344

ITERATOR 257

combined with Composite 362

combined with VISITOR 339

compared with VISITOR 336

in catalog summary 9

use in Lexi 69

ITERATOR 67, 67c, 258c, 263, 372

participant of ITERATOR 259, 259c

iterator 66, 257, 339,

access to aggregate 262

active 260

alternative to in Smalltalk 270

controlling 260

cursor 261

ensuring deletion of 266

external 260, 339, 269

interface to 261, 263

internal 260, 267, 339, see also ListTraverser

null 262, see also NullITERATOR

over recursive structures 262

parameterized with an operation 267

passive 260

polymorphic 258, 261, 265

privileged access to Aggregate 262

robust 261