Don't change the object, I believe

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Post #264,801 by JayMehaffey 8/14/06 11:05:16 AM Reply	Don't change the object, I believe Const in C/C++ is rather messy. But used that way I believe it means that calling IsEmpty() won't change the object it is a method of. Jay
Post #264,917 by ChrisR 8/15/06 12:27:00 PM Reply	Doh. Alright, that answer was too straightforward to register in my brain (especially since C++ is rather obtuse). So based on what you and Todd have said, the const modifier here just means that there is a contract for the method that promises not to alter the state of the object when invoked. More of a "const safe" sort of declaration. Thanks.
Post #264,965 by jb4 8/15/06 4:05:02 PM Reply	More than that... Because IsEmpty() promises not to change the object, The compiler will allow you to invoke this method on a const object (that is, an object whose contents have been declared to be...well...constant). So if you declare a const TextView object, thus: `const TextView aConstView` you could invoke the (const) IsEmpty() method: `bool empty_view = aConstView.IsEmpty(); // compiler will allow this` jb4 "So don't pay attention to the approval ratings that say 68% of Americans disapprove of the job this man is doing. I ask you this, does that not also logically mean that 68% approve of the job he's not doing? Think about it. I haven't." — Stephen Colbert, at the White House Correspondent's Dinner 29Apr06

C++ question on const - (ChrisR) - (24) - Aug. 14, 2006, 10:10:50 AM EDT

Don't change the object, I believe - (JayMehaffey) - (2) - Aug. 14, 2006, 11:05:16 AM EDT

Doh. - (ChrisR) - (1) - Aug. 15, 2006, 12:27:00 PM EDT

More than that... - (jb4) - Aug. 15, 2006, 04:05:02 PM EDT

Re: C++ question on const - (tuberculosis) - (20) - Aug. 14, 2006, 11:22:39 PM EDT

I still don't understand... - (ChrisR) - (19) - Aug. 15, 2006, 10:59:52 AM EDT

Const is not always forced - (JayMehaffey) - Aug. 15, 2006, 11:23:16 AM EDT

Its counterintuitive - (tuberculosis) - (14) - Aug. 15, 2006, 01:03:04 PM EDT

Say WHAT?!? - (jb4) - (13) - Aug. 15, 2006, 04:30:02 PM EDT

You can overload on const - (tuberculosis) - (11) - Aug. 15, 2006, 04:47:41 PM EDT

Why the hell would it do / allow that? - (drewk) - (1) - Aug. 15, 2006, 04:45:34 PM EDT

Bell labs has an unlimited crack budget - (tuberculosis) - Aug. 15, 2006, 04:57:05 PM EDT

The easiness to keep track of is not the issue - (jb4) - (8) - Aug. 15, 2006, 05:49:16 PM EDT

Huh? - (tuberculosis) - (7) - Aug. 15, 2006, 06:51:19 PM EDT

No... - (jb4) - (6) - Aug. 16, 2006, 10:12:37 AM EDT

I think you're talking past each other... - (admin) - Aug. 16, 2006, 11:11:53 AM EDT

And you specify that by.... - (tuberculosis) - (4) - Aug. 16, 2006, 11:48:14 AM EDT

We'll leave it at that. - (jb4) - (3) - Aug. 16, 2006, 12:32:21 PM EDT

I wasn't trying to be sarcastic - (tuberculosis) - (2) - Aug. 16, 2006, 01:27:58 PM EDT

No need to specify OO in this case - (JayMehaffey) - Aug. 16, 2006, 01:35:32 PM EDT

What does the type of the reference have to do with anything - (jb4) - Aug. 16, 2006, 03:06:42 PM EDT

Nominating this for LRPD (new thread) - (lincoln) - Aug. 18, 2006, 03:18:45 PM EDT

Re: I still don't understand... - (jb4) - (2) - Aug. 15, 2006, 04:16:40 PM EDT

Which brings up another question. - (ChrisR) - (1) - Aug. 15, 2006, 08:25:15 PM EDT

Pure virtual functions - (tuberculosis) - Aug. 15, 2006, 09:01:04 PM EDT

Choose life. Choose LRPDism-spotting.
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