| author | timkelly |
| Thu, 10 Dec 2009 13:45:47 -0600 | |
| branch | RCL_2_4 |
| changeset 671 | 80524b72f957 |
| parent 0 | fb279309251b |
| child 1641 | 2b3996fc09a1 |
| permissions | -rw-r--r-- |
|
0
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
1 |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"><html> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
2 |
<head> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
3 |
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
4 |
<meta http-equiv="Content-Style-Type" content="text/css" /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
5 |
<meta name="LASTUPDATED" content="06/17/05 11:09:43" /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
6 |
<title>Hidden Virtual Functions</title> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
7 |
<link rel="StyleSheet" href="../../book.css" type="text/css"/> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
8 |
</head> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
9 |
<body bgcolor="#FFFFFF"> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
10 |
<h3>Hidden Virtual Functions</h3> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
11 |
<p> If you enable the Hidden virtual functions setting, the compiler generates a warning if you declare a non-virtual member function in a subclass that hides an inherited virtual function in a superclass. One function hides another if it has the same name but a different argument type. An example of hidden virtual functions:</p> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
12 |
<div class="listing"> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
13 |
<p>class A {<br />
|
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
14 |
public:<br /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
15 |
virtual void f(int);<br /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
16 |
virtual void g(int);<br /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
17 |
};</p> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
18 |
<p>class B: public A {<br />
|
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
19 |
public:<br /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
20 |
void f(char); // WARNING: Hides A::f(int)<br /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
21 |
virtual void g(int); // OK: Overrides A::g(int)<br /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
22 |
}; </p> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
23 |
</div> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
24 |
<p>The Hidden virtual functions setting corresponds to the pragma <a href="../pragmas/p_warn_hidevirtual.htm">warn_hidevirtual</a>. To check this setting, use <span class="code">__option (warn_hidevirtual)</span>.</p> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
25 |
<p>See <a href="../symbols/sym_settings.htm">Checking Option Settings</a> for information on how to use this directive.<br /> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
26 |
</p> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
27 |
<div id="footer">Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
28 |
|
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
29 |
|
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
30 |
</body> |
|
fb279309251b
DP tools release version Revision: 200912
Deepak Modgil <Deepak.Modgil@Nokia.com>
parents:
diff
changeset
|
31 |
</html> |