Object-oriented Software in Ada 95

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334 TUI the implementation procedure Clear_Screen is begin Put( Prefix & "2J"); end Clear_Screen; --Clear screen procedure Position_Cursor(Col:in Positive; Row:in Positive) is begin Put( Prefix ); Put(Row); Put(";"); Put(Col); Put("H"); end Position_Cursor; The procedure Put, when used to write a positive number without any leading or trailing spaces, is implemented as a recursive procedure. This procedure is used in the package by the public procedure Position_Cursor. procedure Put( N:in Positive ) is --Write decimal number begin if N >= 10 then Put( N / 10 ); end if; Put( Character'Val(N rem 10 + Character'Pos('0') ) ); end Put; end Class_Screen; 23.3 The class Root_window A root window is the class from which all other windows are eventually derived. Its purpose is to define the minimum responsibilities that any type of window must implement. These minimum responsibilities are: Method Send_To Switch_To Switch_Away Refresh About Responsibility Send a character to the window. Inform the window that it is to become the focus for input. Inform the window that it is to lose the focus of input. If appropriate, re-display the window. Return information about a window. Note: There is no requirement that a window has a physical form. Thus, a root window does not need to provide a mechanism for writing into the displayable window. As no concrete instance of a root window is required, the specification for the class Root_window is abstract. This abstract class will be specialized into the various forms of displayable windows on the screen. © M A Smith - May not be reproduced without permission
TUI the implementation 335 with Ada.Finalization; use Ada.Finalization; package Class_Root_Window is type Root_Window is abstract tagged limited private; type P_Root_Window is access all Root_Window'Class; type Attribute is ( Top, Bottom, Left, Right, Abs_X, Abs_Y ); procedure Send_To( The:in out Root_Window; Ch:in Character) is abstract; procedure Switch_To( The:in out Root_Window ) is abstract; procedure Switch_Away( The:in out Root_Window ) is abstract; function About( The:in Root_Window; B:in Attribute) return Natural is abstract; private type Root_Window is abstract new Limited_Controlled with null record; end Class_Root_Window; 23.4 The classes Input_manager and Window_control 23.4.1 Specification of the class Input_manager The input manager controls all interactions between a user and the displayed windows. Currently the only input device is the keyboard. The responsibilities of the input manager are: Method Window_Prolog Window_Start Window_Epilog Responsibility Set up the initial window environment. Start the windowing system by accepting input from a user of the TUI. Close down the windowing system. The Ada specification for the class Input_manager is: with Ada.Finalization; use Ada.Finalization; package Class_Input_Manager is type Input_Manager is abstract tagged limited private; procedure Window_Prologue; --Initialize window system procedure Window_Start; --Start taking user input procedure Window_Epilogue; --Clean up private type Input_Manager is abstract new Limited_Controlled with null record; end Class_Input_Manager; Note: As there is only one screen the class Input_Manager has all class methods. 23.4.2 Specification of the class Window_control The class Window_Control has overall control of the windows displayed on the TUI screen. The responsibilities of this class are: Method Add_To_List Remove_From_List Responsibility Add a new window to the list of managed windows. Remove a window from the list of managed windows. © M A Smith - May not be reproduced without permission
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Reproduction prohibited without per
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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
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Arrays 113 8.4.5 Putting it all tog
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Arrays 115 8.5.2 Attributes of mult
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Arrays 117 The following code would
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Arrays 119 This type is defined in
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Arrays 121 In the implementation of
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Arrays 123 The Ada specification of
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Arrays 125 The function valid check
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9 Case study: Design of a game This
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Case study: Design of a game 129 A
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Case study: Design of a game 131 Co
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Case study: Design of a game 133 Cu
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Case study: Design of a game 135 --
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The specification for the class Cel
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Case study: Design of a game 139 pr
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Case study: Design of a game 141 Th
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Case study: Design of a game 143 Th
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Case study: Design of a game 145 In
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10 Inheritance This chapter introdu
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Two instances of the class Interest
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Inheritance 151 The two classes Acc
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Inheritance 153 which when run, wou
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Inheritance 155 The specialization
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Inheritance 157 Note: The methods o
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Inheritance 159 10.7.1 Putting it a
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Inheritance 161 10.8.1 Implementati
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10.9 Hiding the base class methods
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Inheritance 165 • For an object o
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Exceptions 167 11.1.1 Putting it al
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Exceptions 169 11.3 Private child A
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12 Defining new operators This chap
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Exceptions 173 Using the above pack
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Exceptions 175 The function Rat_Con
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Exceptions 177 12.3.1 Overloading =
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Exceptions 179 The overloaded defin
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Exceptions 181 12.3.5 use type A mo
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13 Exceptions This chapter looks at
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Exceptions 185 Note: The object Eve
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Exceptions 187 A program to demonst
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Exceptions 189 package body Class_S
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14 Generics This chapter looks at g
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Exceptions 193 The above generic pr
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Exceptions 195 14.3 Generic stack T
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Exceptions 197 14.3.1 Putting it al
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Thus, an instantiation of a procedu
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Exceptions 201 14.5 Sorting Some of
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14.6.1 Putting it all together Exce
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Exceptions 205 An efficient impleme
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Exceptions 207 The implementation o
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15 Dynamic memory allocation This c
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Dynamic memory allocation 211 In a
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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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Page 307 and 308: Persistence 285 The process to add
Page 309 and 310: Persistence 287 The procedure Add u
Page 311 and 312: 20 Tasks This chapter describes the
Page 313 and 314: Tasks 291 The execution of the abov
Page 315 and 316: Tasks 293 Likewise, the task Task_I
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Page 319 and 320: Tasks 297 The implementation of the
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Page 323 and 324: Note: 20.7.1 Accept alternative Tas
Page 325 and 326: Tasks 303 the implementation of whi
Page 327 and 328: Tasks 305 • How can a task select
Page 329 and 330: System programming 307 21.1.1 Putti
Page 331 and 332: System programming 309 The followin
Page 333 and 334: 22 A text user interface This chapt
Page 335 and 336: A Text user interface 313 Note: The
Page 337 and 338: A Text user interface 315 with Clas
Page 339 and 340: A Text user interface 317 Window_St
Page 341 and 342: A Text user interface 319 The follo
Page 343 and 344: A Text user interface 321 package C
Page 345 and 346: A Text user interface 323 with Clas
Page 347 and 348: A Text user interface 325 function
Page 349 and 350: A Text user interface 327 • What
Page 351 and 352: TUI the implementation 329 23.1.1 S
Page 353 and 354: TUI the implementation 331 package
Page 355: TUI the implementation 333 23.2.4 T
Page 359 and 360: TUI the implementation 337 The Inpu
Page 361 and 362: TUI the implementation 339 procedur
Page 363 and 364: TUI the implementation 341 New_Line
Page 365 and 366: TUI the implementation 343 private
Page 367 and 368: TUI the implementation 345 The proc
Page 371 and 372: TUI the implementation 349 with Pac
Page 373 and 374: TUI the implementation 351 Method S
Page 377 and 378: TUI the implementation 355 The proc
Page 379 and 380: 24 Scope of declared objects This c
Page 381 and 382: Proc_2_2 Proc_1_1 Proc_2_1 Proc_2_2
Page 383 and 384: 25 Mixed language programming This
Page 385 and 386: Mixed language programming 363 3 Tr
Page 387 and 388: Mixed language programming 365 /* *
Page 389 and 390: Appendix A 367 if Temp < 15 then Pu
Page 391 and 392: Appendix A 369 package body Class_I
Page 393 and 394: Appendix B: Components of Ada B.1 R
Page 395 and 396: T'Digits The decimal precision. Uni
Page 397 and 398: Appendix B 375 access enumeration E
Page 399 and 400: Appendix B 377 B.8.2Ada information
Page 401 and 402: Appendix C 379 package Standard is
Page 403 and 404: Appendix C 381 type Character is (n
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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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