C / C++ / MFC

Re: Problem defining operator&lt;(rhs)

3-Sep-07 14:58

Try the following:

data_<rhs.data_ ||<br>
(data_==rhs.data_ && f1_<rhs.f1_) ||<br>
(data_==rhs.data_ && f1_==rhs.f1 && f2_<rhs.f2_) ||<br>
(data_==rhs.data_ && f1_==rhs.f1 && f2_==rhs.f2_ && f3_<rhs.f3_) ||<br>
(data_==rhs.data_ && f1_==rhs.f1 && f2_==rhs.f2_ && f3_==rhs.f3_ && id_<rhs.id_)

Steve

John R. Shaw3-Sep-07 18:26

John R. Shaw

3-Sep-07 18:26

Thanks, I was afraid something like that would be required. It works in debug mode, as it should, but fails in some cases in the release version; I need to look into why that is. Since the “operator<” may get called thousands of times in some cases I may make it a compile time option and stick to the “memcmp()” solution, as I suspect the call is cheaper than all those tests. I’ll need to run some tests to be sure.

I see no reason why anyone would use anything but built in data types in this class, but I would still like to leave the option open.

Thanks again.

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

Re: Problem defining operator&amp;lt;(rhs)

Stephen Hewitt3-Sep-07 18:54

Re: Problem defining operator&amp;lt;(rhs)

3-Sep-07 18:54

You could get the best of both worlds using something like Boost[^]'s TypeTraits[^] library. See this[^] example for an example of something similar (although not exactly what you want).

Steve

John R. Shaw5-Sep-07 16:03

John R. Shaw

5-Sep-07 16:03

Thanks, I decided to go with the current solution (memcmp) and restrict the usage to integral types as per my original specifications. I tend to let my imagination run wild at times and was trying to add flexibility that even I would never use. Wink | ;)

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

Re: Problem defining operator&amp;lt;(rhs)

Stephen Hewitt5-Sep-07 16:15

any good 3ds max plugin guide?

5-Sep-07 16:15

I've been known to fall into that trap myself.

Steve

nathan73-Sep-07 5:10

nathan7

3-Sep-07 5:10

i've looked thru the official guid, very brief though...

Re: any good 3ds max plugin guide?

Hamid_RT3-Sep-07 6:36

Hamid_RT

3-Sep-07 6:36

Does this a c++ question ?

whether GA can perform character recognition task?

rayluee3-Sep-07 5:08

rayluee

3-Sep-07 5:08

Hi every1, I need help related to image recognition using Genetic Algorithm.(GA)

Would greatly appreciate if anyone can send me any related information eg source code or notes that I can read or used as I am quite confused by the GA implementation in C++.
How an image is recognize/identified using GA?
Simple comparison like character recogntion, Neural network can performed task by training to identified the character, do GA able to perform similar task?

Can email to ray_luee@yahoo.com

Thanks

RayLuee

IMPLEMENT_DYNCREATE with parameters using RTTI or other methods - seeking comments

Vaclav_3-Sep-07 5:07

Vaclav_

3-Sep-07 5:07

I have decided to bite the bullet and find out how to convince MFC that passing parameters to implement IMPLEMENT_DYNCREATE is feasible.

In a nutshell - IMPLEMENT_DYNCREATE access only the default constructor which has no parameters. Tiring to hack the RUNTIME_CLASS and the whole chain down to creation of the object is a nightmare.

The basic for this is that I have a need / want to use same view class with different "parameter". I am basically tired of building a copy of the view class and modifying its methods as required.

There are few articles in here which accomplish this using various approaches - RTTI, "Generic Class Factory" (no longer supported by the author) etc.

I am asking the forum to share experiences with these approaches.
Recommendations, comments etc.

Thanks for your help.
Vaclav

Select a combo box

Fernando A. Gomez F.3-Sep-07 4:52

3-Sep-07 4:52

Hello all. So I have these three combo boxes. According to certain validations, I have to select one of them. I thought that simply calling CComboBox::SetFocus would be enough, yet it is not working. I also tried sending a WM_ACTIVATE messages to the combos, with the same results.

Any thoughts would be really appreciated. Thanks in advance.

FG.

Hope is the negation of reality - Raistlin Majere

Nishad S3-Sep-07 4:54

3-Sep-07 4:54

From where you call this?

- NS -

Fernando A. Gomez F.3-Sep-07 4:57

3-Sep-07 4:57

From the CDialog::OnInitDialog method.

Hope is the negation of reality - Raistlin Majere

Nishad S3-Sep-07 5:00

3-Sep-07 5:00

You should retun FALSE from OnInitDialog, if you explicitly set the focus. And use GotoDlgCtrl instead of SetFocus in Dialogs.

- NS -

Fernando A. Gomez F.3-Sep-07 5:06

3-Sep-07 5:06

I feel a little stupid now. I don't use wizads, but now that you mentioned it, I remebered this "return TRUE unless you're setting the focus" comment that the wizards places in the "return" of the OnInitDialog.

Thanks a lot!

Hope is the negation of reality - Raistlin Majere

Stephen Hewitt3-Sep-07 15:05

3-Sep-07 15:05

This[^] article may interest you.

Steve

Fernando A. Gomez F.3-Sep-07 16:05

3-Sep-07 16:05

Thanks, very interesting indeed.

Hope is the negation of reality - Raistlin Majere

CSocket and CDialog

Nishad S3-Sep-07 4:05

3-Sep-07 4:05

Hi,

I have a dialog based application, which should act as a CSocket server.

In short my need is, if some client is connected to the server, OnAccept of the CSocket should be directed to the dialog class member function.

I am not sure about the right method to do so.

Thanks in advance.

- NS -

Mark Salsbery3-Sep-07 8:48

Mark Salsbery

3-Sep-07 8:48

You can store a CWnd*, HWND, or whatever is appropriate in your socket class and use
that to send messages to the window/dialog.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Nishad S3-Sep-07 19:10

3-Sep-07 19:10

Thanks for the replay. Is this the only way? Frown | :(

I tried to dervie my dialog class from CDialog and CSocket. But failed... Frown | :(

- NS -

Llasus3-Sep-07 21:23

Llasus

3-Sep-07 21:23

Do you really need them to be together? Why not separate another class and make that one your CSocket derived class? If your concerned on the variables/objects you need in your dlg class, just pass the class pointer to the CSocket class.

Nishad S3-Sep-07 21:39

3-Sep-07 21:39

My concern is that then there will be a mapping from csocket class to the dialog class. I like to avoid it.

- NS -

Mark Salsbery4-Sep-07 5:18

Mark Salsbery

4-Sep-07 5:18

Why did the multiple inheritance fail?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Nishad S4-Sep-07 17:33

4-Sep-07 17:33

It shows compilation error.

There is some ambiguity problem since both are from CObject.

- NS -

Mark Salsbery5-Sep-07 5:11

Mark Salsbery

5-Sep-07 5:11

I'm personally not a fan of CAsyncSocket and definitely not CSocket.

If you don't like adding a CWnd* or HWND to the socket class then it's
much easier to use the socket APIs directly.

A SOCKET member can be added to a window/dialog class and Using WSAAsyncSelect
you can get socket notifications directly in the window.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Nishad S5-Sep-07 18:10