Articles   Members Online:
-Article/Tip Search
-News Group Search over 21 Million news group articles.
-Delphi/Pascal
-CBuilder/C++
-C#Builder/C#
-JBuilder/Java
-Kylix
Member Area
-Home
-Account Center
-Top 10 NEW!!
-Submit Article/Tip
-Forums Upgraded!!
-My Articles
-Edit Information
-Login/Logout
-Become a Member
-Why sign up!
-Newsletter
-Chat Online!
-Indexes NEW!!
Employment
-Build your resume
-Find a job
-Post a job
-Resume Search
Contacts
-Contacts
-Feedbacks
-Link to us
-Privacy/Disclaimer
Embarcadero
Visit Embarcadero
Embarcadero Community
JEDI
Links
How to test if two objects are "related" or "identical" (RTTI) Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
15-Sep-02
Category
Object Pascal
Language
Delphi All Versions
Views
94
User Rating
No Votes
# Votes
0
Replies
0
Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: William Gerbert

Testing if two objects are "related" or "identical" (RTTI)

Answer:

Do you need to know whether object a is of a derived class from the class that 
another object b is of? Or if they may even be of the same class?

The following little code snippet tells it..


1   program dummy;
2   
3   var
4     a, b: TObject;
5   
6   begin
7     // some code to assign the pointers
8     // ...
9   
10    // now evaluate the RTTI of two instantiated objects
11    if a is b then
12      ShowMessage('a is derived from b or same class');
13  
14    if a.classtype = b.classtype then
15      ShowMessage('a and b are of the same class');
16  
17    // alternative to ClassType comparison (slower!)
18    if a.ClassName = b.ClassName then
19      ShowMessage('a and b are of the same class')
20  end.


			
Vote: How useful do you find this Article/Tip?
Bad Excellent
1 2 3 4 5 6 7 8 9 10

 

Advertisement
Share this page
Advertisement
Download from Google

Copyright © Mendozi Enterprises LLC