I

id type, No parameters–A variable number of parameters, Dynamic typing, Static typing, Types, Types

dynamic typing and, Dynamic typing

IMP type and, Types

static typing, Static typing

immutable objects, Writing copy methods–Writing copy methods

IMP type, Types

@implementation directive, Class Declarations and Definitions

implementing, Classes, Implementing a class, Implementing a method, Private methods, Implementing a category, Adopting a protocol

categories, Implementing a category

classes, Classes, Implementing a class

methods, Implementing a method

private methods, Private methods

protocols, Adopting a protocol

#import directive, Declaring an interface, Preprocessor Symbols

in type qualifier, Type qualifiers, Pointer Parameter Qualifiers

#include directive, Declaring an interface

informal protocols, Informal protocols

inheritance, Inheritance and Subtyping, Testing inheritance and conformance, Posing, Testing inheritance and conformance, Posing

changing hierarchy at runtime, Posing, Posing

of objects, testing, Testing inheritance and conformance, Testing inheritance and conformance

-init method, Calling creation methods, Creating, copying, and freeing objects, Creating, copying, and freeing objects

+initialize method, Initializing classes, Creating, copying, and freeing objects, Creating, copying, and freeing objects

NSObject class, Creating, copying, and freeing objects

Object class, Creating, copying, and freeing objects

initializers, Creating an Object, Writing creation methods, Writing creation methods–Sample code for initialization

chaining of, Writing creation methods

designated, Writing creation methods–Sample code for initialization

setting fields with, Creating an Object

-initWithCoder: method, Archiving Descendants of NSObject

inout type qualifier, Type qualifiers, Pointer Parameter Qualifiers

instance methods, Classes, Declaring an interface, No parameters, Special receivers, Variables, Methods, Information about methods, Information about methods

asking objects about methods, Information about methods, Information about methods

in NSObject class, Information about methods

in Object class, Information about methods

declaring methods, No parameters

for root classes, Methods

self variable and, Variables

special receivers and, Special receivers

instance variables, Objects (see fields)

+instanceMethodFor: method, Information about methods, Optimizing Method Calls

+instanceMethodForSelector: method, Information about methods, Optimizing Method Calls

+instanceMethodSignatureForSelector: method, Information about methods

+instancesRespondTo: method, Information about methods

+instancesRespondToSelector: method, Information about methods

@interface directive, Inheritance and Subtyping, Class Declarations and Definitions

interfaces, Classes, Declaring an interface–Declaring an interface

declaring, Declaring an interface–Declaring an interface

isa field, Variables, Class Objects, Metaclass Objects, Fields

class objects and, Class Objects

metaclass objects and, Metaclass Objects

in root classes, Fields

-isClass method, Testing object type

-isEqual: method, Identifying objects and classes, Identifying objects and classes

-isInstance method, Testing object type

-isKindOf: method, Testing inheritance and conformance

-isKindOfClass: method, Testing inheritance and conformance

-isKindOfClassNamed: method, Testing inheritance and conformance

-isMemberOf: method, Testing inheritance and conformance

-isMemberOfClass: method, Testing inheritance and conformance

-isMemberOfClassNamed: method, Testing inheritance and conformance

-isMetaClass method, Testing object type

-isProxy method, Testing inheritance and conformance

ivars, Objects (see fields)