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31.8 Laying Out Classes
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For details on documenting classes, see Commenting Classes, Files, and Programs in Section 32.5. For details on the process of creating classes, see Section 9.1, Summary of Steps in Building Classes and Routines. For a discussion of the differences between good and bad classes, see 6, Working Classes.
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3 CROSS-REFERENCE
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Here are several guidelines for laying out code within a class. The next section contains guidelines for laying out code within a file.
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Laying Out Class Interfaces
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In laying out class interfaces, the convention is to present the class members in the following order: 1. Header comment that describes the class and provides any notes about the overall usage of the class 2. Constructors and destructors
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31. Layout and Style
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Page 42
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3. Public routines 4. Protected routines 5. Private routines and member data
Laying Out Class Implementations
Class implementations are generally laid out in this order: 1. Header comment that describes the contents of the file the class is in 2. Class data 3. Public routines 4. Protected routines 5. Private routines
If you have more than one class in a file, identify each class clearly Routines that are related should be grouped together into classes. A reader scanning your code should be able to tell easily which class is which. Identify each class clearly by using several blank lines between it and the classes next to it. A class is like a chapter in a book. In a book, you start each chapter on a new page and use big print for the chapter title. Emphasize the start of each class similarly. An example of separating classes is shown in Listing 31-64.
Listing 31-64. C++ example of formatting the separation between classes.
This is the last routine in a class.
// create a string identical to sourceString except that the // blanks are replaced with underscores. void EditString::ConvertBlanks( char *sourceString, char *targetString ) { Assert( strlen( sourceString ) <= MAX_STRING_LENGTH ); Assert( sourceString != NULL ); Assert( targetString != NULL ); int charIndex = 0; do { if ( sourceString[ charIndex ] == " " ) { targetString[ charIndex ] = '_'; } else { targetString[ charIndex ] = sourceString[ charIndex ];
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31. Layout and Style
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} charIndex++; } while sourceString[ charIndex ] != '\0'; } //---------------------------------------------------------------------// MATHEMATICAL FUNCTIONS // // This class contains the program's mathematical functions. //---------------------------------------------------------------------// find the arithmetic maximum of arg1 and arg2 int Math::Max( int arg1, int arg2 ) { if ( arg1 > arg2 ) { return arg1; } else { return arg2; } }
0 The beginning of the new class is marked with several blank lines and the name of the class.
6 This is the first routine in a new class.
// find the arithmetic minimum of arg1 and arg2 int Math::Min( int arg1, int arg2 ) { if ( arg1 < arg2 ) { return arg1; } else { return arg2; } }
8 This routine is separated from 9 the previous routine by blank lines only.
Avoid overemphasizing comments within classes. If you mark every routine and comment with a row of asterisks instead of blank lines, you ll have a hard time coming up with a device that effectively emphasizes the start of a new class. An example is shown in Listing 31-65.
Listing 31-65. C++ example of overformatting a class.
//********************************************************************** //********************************************************************** // MATHEMATICAL FUNCTIONS // // This class contains the program//s mathematical functions. //********************************************************************** //********************************************************************** //**********************************************************************
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// find the arithmetic maximum of arg1 and arg2 //********************************************************************** int Math::Max( int arg1, int arg2 ) { //********************************************************************** if ( arg1 > arg2 ) { return arg1; } else { return arg2; } } //********************************************************************** // find the arithmetic maximum of arg1 and arg2 //********************************************************************** int Math::Min( int arg1, int arg2 ) { //********************************************************************** if ( arg1 < arg2 ) { return arg1; } else { return arg2; } }
In this example, so many things are highlighted with asterisks that nothing is really emphasized. The program becomes a dense forest of asterisks. Although it s more an aesthetic than a technical judgment, in formatting, less is more. If you must separate parts of a program with long lines of special characters, develop a hierarchy of characters (from densest to lightest) instead of relying exclusively on asterisks. For example, use asterisks for class divisions, dashes for routine divisions, and blank lines for important comments. Refrain from putting two rows of asterisks or dashes together. An example is shown in Listing 31-66.
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