Object-oriented Software in Ada 95

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164 Inheritance 10.9.1 Visibility rules (Hidden base class) The visibility of items in the base class and derived class is illustrated in Figure 10.5. Key Base class visibility Derived class visibility Visible to class and client. Visible Visible Visible to this class only Not visible to class or client Visible to class Not visible Visible to class Not visible Figure 10.5 Visibility of components in base and derived classes. The consequence of this is that any methods from the base class that a client of the derived class may wish to use have to be explicitly made available by providing an appropriate procedure or function in the derived class. 10.9.2 Putting it all together The program below illustrates the use of this restricted account. with Statement; procedure Main is Corinna :Restricted_Account; --Can only deposit Begin Statement( Corinna ); Deposit( Corinna, 50.00 ); Statement( Corinna ); end Ex1; which when compiled with a suitable definition for the procedure Statement would produce output of the form:: Mini statement: The amount on deposit is £ 0.00 Mini statement: The amount on deposit is £50.00 10.10 Self-assessment • How can the use of inheritance save time in the production of software? • Can any previously defined class be used as a base class from which other classes are derived? • Can a derived class see the private data attributes of the base class? Explain why this is so. • What is the purpose of the pre-defined package Ada.Finalization? © M A Smith - May not be reproduced without permission
Inheritance 165 • For an object o which is an instance of a derived class, how does a programmer call the method m in the base class which has been overloaded by another method m in the derived class? • Why can the code of Finalization in the class Account_At not be called twice? 10.11 Exercises Construct the following: • Employee_Pay A class Employee_Pay which represents a person’s salary has the following methods: Method Responsibility Set_hourly_rate Set the hourly rate. Add_hours_worked Accumulate the number of hours worked so far. Pay Deliver the pay for this week. Reset Reset the hours worked back to zero. Hours_Worked Deliver the number of hours worked so far this week. Pay_rate Deliver the hourly pay rate. Tax is to be deducted at 20% of total pay. • Test A program to test the class Employee_Pay. • Better_Employee_Pay A class Better_Employee_Pay which represents a person’s salary. This extends the class Employee_Pay to add the additional methods of: Method Responsibility Set_Overtime_Pay Set the overtime pay rate. Normal_Pay_Hours Set the number of hours in a week that have to be worked before the overtime pay rate is applied. Pay Deliver the pay for this week. This will consist of the hours worked at the normal pay rate plus the hours worked at the overtime rate. • Test A program to test the class Better_employee_pay. • Employee_Pay_With_Repayment. A class Employee_Pay_With_Repayment which represents a person’s salary after the deduction of the weekly repayment of part of a loan for travel expenses. This extends the class Better_employee_pay to add the additional methods of: Method Set_Deduction Pay Responsibility Set the weekly deduction Deliver the pay for this week. This will include the deduction of the money for the employee loan if possible. Remember to include the possibility of an employee not being able to repay the weekly repayment of their loan as they have not worked enough hours. • test A program to test the class Employee_Pay_With_Repayment. © M A Smith - May not be reproduced without permission
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Contents CONTENTS .................
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vi Contents 4.21 EXERCISES.........
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viii Contents 10.1 INTRODUCTION ...
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x Contents 16.8.1 Converting a base
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xii Contents 23.6.3 The specificati
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Preface This book is aimed at stude
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xvi Actual parameter Preface The ph
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xviii Elaboration Preface At run-ti
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xx Object Preface An instance of a
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1 Introduction to programming 1 Int
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Introduction to programming 3 they
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Introduction to programming 5 • T
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Introduction to programming 7 The s
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Introduction to programming 9 Line
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Introduction to programming 11 Cost
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Introduction to programming 13 In t
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Introduction to programming 15 For
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Introduction to programming 17 •
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Software design 19 In software the
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Software design 21 2.4 The class In
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Software design 23 Inheritance diag
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25 Ada introduction: Part 1 3 Ada i
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Ada introduction: Part 1 27 3.3.2 C
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Ada introduction: Part 1 29 can be
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Ada introduction: Part 1 31 with Ad
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Ada introduction: Part 1 33 To inpu
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Ada introduction: Part 1 35 Functio
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Ada introduction: Part 1 37 3.14 Ex
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Note: In reality the floating point
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Ada introduction: Part 2 41 4.4 Mod
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Ada introduction: Part 2 43 4.7.2 I
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Ada introduction: Part 2 45 For exa
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Ada introduction: Part 2 47 When pe
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Ada introduction: Part 2 49 4.12 Co
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Ada introduction: Part 2 51 4.13.1
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Ada introduction: Part 2 53 Note 3
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Ada introduction: Part 2 55 if Ch i
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Ada introduction: Part 2 57 For exa
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Ada introduction: Part 2 59 type Mi
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Procedures and functions 61 The fun
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Procedures and functions 63 The maj
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Procedures and functions 65 Mode Al
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Procedures and functions 67 The pro
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Procedures and functions 69 5.8 Dif
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Procedures and functions 71 Note: T
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6 Packages as classes This chapter
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Packages as classes 75 6.3.1 An obj
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Packages as classes 77 package Clas
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Packages as classes 79 The body of
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Packages as classes 81 Thus without
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Packages as classes 83 6.9 Type pri
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Packages as classes 85 which when r
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Packages as classes 87 The Ada spec
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The main body of the program proces
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Packages as classes 91 The procedur
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Packages as classes 93 Construct th
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Data structures 95 This initializat
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Data structures 97 Then an assignme
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Data structures 99 In Ada a variant
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Data structures 101 7.10 Exercises
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which when combined with appropriat
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Arrays 105 with Ada.Text_Io, Class_
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Arrays 107 8.3.1 Putting it all tog
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Arrays 109 8.4.1 The class Board Th
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Arrays 111 8.4.4 The class Board Th
Page 135 and 136: Arrays 113 8.4.5 Putting it all tog
Page 137 and 138: Arrays 115 8.5.2 Attributes of mult
Page 139 and 140: Arrays 117 The following code would
Page 141 and 142: Arrays 119 This type is defined in
Page 143 and 144: Arrays 121 In the implementation of
Page 145 and 146: Arrays 123 The Ada specification of
Page 147 and 148: Arrays 125 The function valid check
Page 149 and 150: 9 Case study: Design of a game This
Page 151 and 152: Case study: Design of a game 129 A
Page 153 and 154: Case study: Design of a game 131 Co
Page 155 and 156: Case study: Design of a game 133 Cu
Page 157 and 158: Case study: Design of a game 135 --
Page 159 and 160: The specification for the class Cel
Page 161 and 162: Case study: Design of a game 139 pr
Page 163 and 164: Case study: Design of a game 141 Th
Page 165 and 166: Case study: Design of a game 143 Th
Page 167 and 168: Case study: Design of a game 145 In
Page 169 and 170: 10 Inheritance This chapter introdu
Page 171 and 172: Two instances of the class Interest
Page 173 and 174: Inheritance 151 The two classes Acc
Page 175 and 176: Inheritance 153 which when run, wou
Page 177 and 178: Inheritance 155 The specialization
Page 179 and 180: Inheritance 157 Note: The methods o
Page 181 and 182: Inheritance 159 10.7.1 Putting it a
Page 183 and 184: Inheritance 161 10.8.1 Implementati
Page 185: 10.9 Hiding the base class methods
Page 189 and 190: Exceptions 167 11.1.1 Putting it al
Page 191 and 192: Exceptions 169 11.3 Private child A
Page 193 and 194: 12 Defining new operators This chap
Page 195 and 196: Exceptions 173 Using the above pack
Page 197 and 198: Exceptions 175 The function Rat_Con
Page 199 and 200: Exceptions 177 12.3.1 Overloading =
Page 201 and 202: Exceptions 179 The overloaded defin
Page 203 and 204: Exceptions 181 12.3.5 use type A mo
Page 205 and 206: 13 Exceptions This chapter looks at
Page 207 and 208: Exceptions 185 Note: The object Eve
Page 209 and 210: Exceptions 187 A program to demonst
Page 211 and 212: Exceptions 189 package body Class_S
Page 213 and 214: 14 Generics This chapter looks at g
Page 215 and 216: Exceptions 193 The above generic pr
Page 217 and 218: Exceptions 195 14.3 Generic stack T
Page 219 and 220: Exceptions 197 14.3.1 Putting it al
Page 221 and 222: Thus, an instantiation of a procedu
Page 223 and 224: Exceptions 201 14.5 Sorting Some of
Page 225 and 226: 14.6.1 Putting it all together Exce
Page 227 and 228: Exceptions 205 An efficient impleme
Page 229 and 230: Exceptions 207 The implementation o
Page 231 and 232: 15 Dynamic memory allocation This c
Page 233 and 234: Dynamic memory allocation 211 In a
Page 235 and 236: Dynamic memory allocation 213 One w
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Dynamic memory allocation 215 15.2.
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Dynamic memory allocation 217 The p
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Dynamic memory allocation 221 A ben
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15.7 Attributes 'Access and 'Unchec
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16 Polymorphism In the processes de
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Polymorphism 229 This can be implem
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Polymorphism 231 16.2.1 Putting it
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Polymorphism 233 Figure 16.3 Hetero
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Polymorphism 235 16.5 A building in
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Polymorphism 237 An example interac
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Polymorphism 239 The conversion fro
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Polymorphism 241 Screen Observed Ob
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Polymorphism 243 The method Add_Obs
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Polymorphism 245 The functions vali
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Polymorphism 247 The driver program
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17 Containers This chapter describe
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Containers 251 This mirrors closely
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Containers 253 will produce the fol
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Containers 255 When an instance of
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Containers 257 When the iterator Co
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Containers 259 In the implementatio
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Containers 261 A deep copy of this
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Containers 263 • If the objects o
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Containers 265 17.6.1 Ada specifica
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Containers 267 The procedure Adjust
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17.7 A set Containers 269 Using as
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Containers 271 17.7.1 Putting it al
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18 Input and output This chapter de
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Input and output 275 18.2 Reading a
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Input and output 277 Then the follo
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Input and output 279 18.5 Self-asse
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Persistence 281 A program to implem
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Persistence 283 with Ada.Strings.Un
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Persistence 285 The process to add
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Persistence 287 The procedure Add u
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20 Tasks This chapter describes the
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Tasks 291 The execution of the abov
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Tasks 293 Likewise, the task Task_I
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Tasks 295 20.4 Protected type In es
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Tasks 297 The implementation of the
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Tasks 299 to the entry prevents the
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Note: 20.7.1 Accept alternative Tas
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Tasks 303 the implementation of whi
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Tasks 305 • How can a task select
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System programming 307 21.1.1 Putti
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System programming 309 The followin
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22 A text user interface This chapt
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A Text user interface 313 Note: The
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A Text user interface 315 with Clas
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A Text user interface 317 Window_St
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A Text user interface 319 The follo
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A Text user interface 321 package C
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A Text user interface 323 with Clas
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A Text user interface 325 function
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A Text user interface 327 • What
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TUI the implementation 329 23.1.1 S
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TUI the implementation 331 package
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TUI the implementation 333 23.2.4 T
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TUI the implementation 335 with Ada
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TUI the implementation 337 The Inpu
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TUI the implementation 339 procedur
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TUI the implementation 341 New_Line
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TUI the implementation 343 private
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TUI the implementation 345 The proc
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TUI the implementation 349 with Pac
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TUI the implementation 351 Method S
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TUI the implementation 355 The proc
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24 Scope of declared objects This c
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Proc_2_2 Proc_1_1 Proc_2_1 Proc_2_2
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25 Mixed language programming This
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Mixed language programming 363 3 Tr
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Mixed language programming 365 /* *
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Appendix A 367 if Temp < 15 then Pu
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Appendix A 369 package body Class_I
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Appendix B: Components of Ada B.1 R
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T'Digits The decimal precision. Uni
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Appendix B 375 access enumeration E
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Appendix B 377 B.8.2Ada information
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Appendix C 379 package Standard is
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Appendix C 381 type Character is (n
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Appendix C 383 package Ada.IO_Excep
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Appendix C 385 --Specification of l
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Appendix C 387 procedure Get(File :
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Appendix C 389 procedure Get(Item :
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Appendix C 391 package Ada.Characte
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Appendix C 393 --Conversion, Concat
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Appendix C 395 return Natural; Goin
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Appendix C 397 Right : in Bounded_S
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Appendix C 399 Count : out size_t;
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Appendix C 401 C.14 The Package Ada
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Appendix C 403 --Storage-related De
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Appendix D 405 with Ada.Text_Io; us
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Appendix D 407 with Ada.Text_Io, Ad
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Appendix D 409 package Class_Perfor
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Appendix D 411 declare Kb : constan
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Appendix D 413 package body Class_B
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Appendix D 415 The instantiation of
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Appendix D 417 with Ada.Text_Io, Ad
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References Intermetrics (1995) Ada
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Index 421 'class, 233 Class attribu
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Index 423 + dyadic, 53 monadic, 54
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Object-oriented Software in Ada 95

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