annotate doc/misc/html/oldclasslib/array.html @ 2:4b08ee1ecb99

Adjust install notes to clarify that Wine applies only to the Windows build. (Thanks to Perry Metzger for test-driving.)
author David A. Holland
date Sun, 26 Apr 2009 17:58:26 -0400
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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2 <HTML>
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3 <HEAD>
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4 <TITLE>Array Storage Class Definition</TITLE>
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5 </HEAD>
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8 <BODY BGCOLOR="#ffffff" BACKGROUND="tilbl6h.gif"
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9 TEXT="#000000" LINK="#0033CC"
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10 VLINK="#CC0033" ALINK="#CC0099">
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11
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12 <P>
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13 <IMG ALIGN="right" SRC="../images/agrsl6c.gif" ALT="AnaGram"
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14 WIDTH=124 HEIGHT=30 >
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15 <BR CLEAR="all">
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16 Back to :
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17 <A HREF="../index.html">Index</A> |
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18 <A HREF="index.html">Class libraries for examples</A>
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19 <P>
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20
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21 <IMG ALIGN="bottom" SRC="../images/rbline6j.gif" ALT="----------------------"
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22 WIDTH=1010 HEIGHT=2 >
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23 <P>
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24
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25 <H1>Array Storage Class Definition</H1>
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26 <IMG ALIGN="bottom" SRC="../images/rbline6j.gif" ALT="----------------------"
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27 WIDTH=1010 HEIGHT=2 >
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28 <P>
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29 <BR>
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30 <H2>Introduction</H2>
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31 <P>
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32
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33 <CODE>array&lt;class T&gt; </CODE>
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34 is a template class that provides for storage
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35 of arrays of any type. It takes care of allocating storage
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36 and releasing it on function exit. It also checks all array
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37 accesses for valid index values, providing protection against
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38 out of bounds references.
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39 <P>
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40 <BR>
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41
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42 <H2> Constructors </H2>
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43
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44 There are two constructors:
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45 <PRE>
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46 array&lt;class T&gt;(unsigned n);
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47 array&lt;class T&gt;(T *init_array, unsigned n);
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48 </PRE>
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49 The first constructor simply allocates an array of n elements
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50 of type T and clears the array to zero.
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51 <P>
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52 The second constructor allocates an array of n elements of
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53 type T and copies the contents of init_array to it.
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54 <P>
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55 Examples:
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56 <PRE>
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57 array<int> integers(300);
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58 array<char> str("Hello, world", 13);
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59 </PRE>
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60 <P>
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61 <BR>
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62
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63 <H2> Data Access </H2>
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64
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65 Two overloaded operators, the cast operator <CODE> (T *) </CODE>
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66 and the subscript operator <CODE> []</CODE>, provide access to the
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67 contents of the array. The cast operator provides a pointer to the
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68 data in the array. The subscript operator provides a reference to a
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69 particular element, which can be used either to read or to
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70 write the element. Note that the use of cast operators is
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71 often implicit rather than explicit.
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72 <P>
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73 For example, using the above declarations, one may write:
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74 <PRE>
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75 int k = integers[20];
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76 int *p = integers; // Implicit use of cast operator
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77 char *sp = str; // Implicit use of cast operator
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78 char c = str[5];
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79 str[6] = '!';
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80 </PRE>
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81 The effect of these definitions is that for almost all
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82 purposes you can use the array name exactly as though it were
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83 a pointer to your data.
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84 <P>
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85 <BR>
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86
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87 <H2> Size of the Array </H2>
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88
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89 To find the length of a local array, use size():
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90 <PRE>
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91 int n = size(integers);
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92 </PRE>
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93 <P>
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94 <BR>
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95
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96
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97 <IMG ALIGN="bottom" SRC="../images/rbline6j.gif" ALT="----------------------"
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98 WIDTH=1010 HEIGHT=2 >
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99 <P>
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100 <IMG ALIGN="right" SRC="../images/pslrb6d.gif" ALT="Parsifal Software"
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101 WIDTH=181 HEIGHT=25>
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102 <BR CLEAR="right">
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103
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104 <P>
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105 Back to :
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106 <A HREF="../index.html">Index</A> |
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107 <A HREF="index.html">Class libraries for examples</A>
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108 <P>
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109
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110 <ADDRESS><FONT SIZE="-1">
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111 AnaGram parser generator - examples<BR>
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112 Array Storage Class Definition<BR>
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113 Copyright &copy; 1993-1999, Parsifal Software. <BR>
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114 All Rights Reserved.<BR>
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115 </FONT></ADDRESS>
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116
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117 </BODY>
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118 </HTML>
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119