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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>page_1061</title> <link rel="stylesheet" href="reset.css" type="text/css" media="all"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> </head> <body> <table summary="top nav" border="0" width="100%"> <tr> <td align="left" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_1060.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_1061</strong></td> <td align="right" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_1062.html">next page ></a></td> </tr> <tr> <td align="left" colspan="3" style="background: #ffffff; padding: 20px;"> <table border="0" width="100%" cellpadding="0"><tr><td align="center"> <table border="0" cellpadding="2" cellspacing="0" width="100%"><tr><td align="left"></td> <td align="right"></td> </tr></table></td></tr><tr><td align="left"><p></p><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="right"><font face="Times New Roman, Times, Serif" size="2" color="#FF0000">Page 1061</font></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">list1.Insert(352);<br />list1.Insert(48);<br />list2.Insert(12);<br />聽聽.<br />聽聽.<br />聽聽.<br />if聽(聽!list2.IsEmpty()聽)<br />聽聽聽聽list2.DeleteTop(item);</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3">then each of the two objects </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">list1</font><font face="Times New Roman, Times, Serif" size="3"> and </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">list2</font><font face="Times New Roman, Times, Serif" size="3"> has its own private </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">head</font><font face="Times New Roman, Times, Serif" size="3"> variable and maintains its own dynamic linked list on the free store.</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3">In Figure 18-6, the specification file </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ordlist.h</font><font face="Times New Roman, Times, Serif" size="3"> declares a type </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">NodeType</font><font face="Times New Roman, Times, Serif" size="3">, but only as a forward declaration. The only reason we need to declare the identifier </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">NodeType</font><font face="Times New Roman, Times, Serif" size="3"> in the specification file is so that the data type of the private variable </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">head</font><font face="Times New Roman, Times, Serif" size="3"> can be specified. In the spirit of information hiding, we place the complete declaration of </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">NodeType</font><font face="Times New Roman, Times, Serif" size="3"> into the implementation file </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ordlist.cpp</font><font face="Times New Roman, Times, Serif" size="3">. The complete declaration is an implementation detail that the user does not need to know about. Here's how </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">ordlist.cpp</font><font face="Times New Roman, Times, Serif" size="3"> starts out:</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Courier New, Courier, Mono New, Courier, Mono" size="2">//******************************************************************<br />//聽IMPLEMENTATION聽FILE聽(ordlist.cpp)<br />//聽This聽file聽implements聽the聽OrdList聽class聽member聽functions<br />//聽List聽representation:聽a聽linked聽list聽of聽dynamic聽nodes.<br />//******************************************************************<br />#include聽"ordlist.h"<br />#include聽<iostream.h><br />#include聽<stddef.h>聽聽聽聽//聽For聽NULL<br /><br />typedef聽NodeType*聽NodePtr;<br />struct聽NodeType<br />{<br />聽聽聽聽ComponentType聽component;<br />聽聽聽聽NodePtr聽聽聽聽聽聽聽link;<br />};<br /><br />//聽Private聽members聽of聽class:<br />//聽聽聽聽聽NodePtr聽head;聽聽聽聽聽聽聽聽聽聽聽聽External聽pointer聽to聽linked聽list<br />聽聽.<br />聽聽.<br />聽聽.</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table><table border="0" cellspacing="0" cellpadding="0"><tr><td rowspan="5"></td> <td colspan="3" height="12"></td> <td rowspan="5"></td></tr><tr><td colspan="3"></td></tr><tr><td></td> <td><font face="Times New Roman, Times, Serif" size="3">To illustrate some commonly used algorithms on dynamic linked lists, let's look at the implementations of the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">OrdList</font><font face="Times New Roman, Times, Serif" size="3"> member functions. Creating an empty linked list is the easiest of the algorithms, so we begin there.</font></td><td></td></tr><tr><td colspan="3"></td></tr><tr><td colspan="3" height="1"></td></tr></table></td></tr></table><p><font size="0"></font></p>聽 </td> </tr> <tr> <td align="left" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_1060.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_1061</strong></td> <td align="right" width="30%" style="background: #EEF3E2"><a style="color: blue; font-size: 120%; font-weight: bold; text-decoration: none; font-family: verdana;" href="page_1062.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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