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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_994</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_993.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_994</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_995.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 994</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="Times New Roman, Times, Serif" size="3">FIGURE 17-10 (continued)</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">聽聽聽聽聽聽Date(聽/*聽in聽*/聽int聽聽聽聽聽聽聽聽聽initMo,<br />聽聽聽聽聽聽聽聽聽聽聽聽/*聽in聽*/聽int聽聽聽聽聽聽聽聽聽initDay,<br />聽聽聽聽聽聽聽聽聽聽聽聽/*聽in聽*/聽int聽聽聽聽聽聽聽聽聽initYr,<br />聽聽聽聽聽聽聽聽聽聽聽聽/*聽in聽*/聽const聽char*聽msgStr聽);<br />聽聽聽聽聽聽聽聽//聽Constructor<br />聽聽聽聽聽聽聽聽//聽Precondition:<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽1聽<=聽initMo聽<=聽12<br />聽聽聽聽聽聽聽聽//聽聽&&Sc聽1聽<=聽initDay聽<=聽maximum聽number聽of聽days聽in聽initMo<br />聽聽聽聽聽聽聽聽//聽聽&&聽1582聽<聽initYr<br />聽聽聽聽聽聽聽聽//聽聽&&聽msgStr聽is聽assigned<br />聽聽聽聽聽聽聽聽//聽Postcondition:<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽New聽class聽object聽is聽constructed聽with聽a聽date聽of<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽initMo,聽initDay,聽initYr聽and聽a聽message聽string聽msgStr<br /><br />聽聽聽聽聽聽Date(聽const聽Date&聽otherDate聽);<br />聽聽聽聽聽聽聽聽//聽Copy-constructor<br />聽聽聽聽聽聽聽聽//聽Postcondition:<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽New聽class聽object聽is聽constructed聽with聽date聽and<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽message聽string聽the聽same聽as聽otherDate's<br />聽聽聽聽聽聽聽聽//聽Note:<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽This聽constructor聽is聽implicitly聽invoked聽whenever聽a<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽Date聽object聽is聽passed聽by聽value,聽is聽returned聽as聽a<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽function聽value,聽or聽is聽initialized聽by聽another<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽Date聽object聽in聽a聽declaration<br /><br />聽聽聽聽聽聽~Date();<br />聽聽聽聽聽聽聽聽//聽Destructor<br />聽聽聽聽聽聽聽聽//聽Postcondition:<br />聽聽聽聽聽聽聽聽//聽聽聽聽聽Message聽string聽is聽destroyed<br />private:<br />聽聽聽聽int聽聽聽mo;<br />聽聽聽聽int聽聽聽day;<br />聽聽聽聽int聽聽聽yr;<br />聽聽聽聽char*聽msg;<br /><br />};</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"><i>Class Destructors</i></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">The </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">Date</font><font face="Times New Roman, Times, Serif" size="3"> class of Figure 17-10 provides a destructor function named </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">~Date</font><font face="Times New Roman, Times, Serif" size="3">. A class destructor, identified by a tilde ( </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">~</font><font face="Times New Roman, Times, Serif" size="3"> ) preceding the name of the class, can be thought of as the opposite of a constructor. Just as a constructor is implicitly invoked when control reaches the declaration of a class object, a destructor is implicitly invoked when the class object is destroyed. A class object is destroyed when it goes out of scope. (An automatic object goes out of scope when control leaves the block in which it is declared. A static object goes out of scope when program execution terminates.) The following blockwhich might be a function body, for exampleincludes remarks at the locations where the constructor and destructor are invoked:</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_993.html">< previous page</a></td> <td align="center" width="40%" style="background: #EEF3E2"><strong style="color: #2F4F4F; font-size: 120%;">page_994</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_995.html">next page ></a></td> </tr> </table> </body> </html>⌨️ 快捷键说明
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