error compile

[mickey]

Hi,
I change including <mywidget.h> from declaration to implementation (in qtDesigner) and now compile. But Why?
Thanks

[wysota]

And what is mywidget.h? Could we see its contents? Are you by any chance including mainwindow.h there?

[mickey]

ifndef MYWIDGET_H
#define MYWIDGET_H
#include <qgl.h>
#include <qpoint.h>
#include <qtimer.h>
#include "mainform.h"
class MainForm;
#define BUFSIZE 512
 
class MyWidget : public  QGLWidget 
    {		 
        Q_OBJECT
    public:
 
         MyWidget( QWidget *parent = 0, const char *name = 0, const QGLWidget* shareWidget = 0);
        ~MyWidget();
.........
};

ifndef MYWIDGET_H
#define MYWIDGET_H
#include <qgl.h>
#include <qpoint.h>
#include <qtimer.h>
#include "mainform.h"
class MainForm;
#define BUFSIZE 512

class MyWidget : public  QGLWidget 
    {		 
        Q_OBJECT
    public:
			
         MyWidget( QWidget *parent = 0, const char *name = 0, const QGLWidget* shareWidget = 0);
        ~MyWidget();
.........
};

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Is it #include "mainform.h" the problems? I need take it here... But wich is different between include in implem and in declaration? I thought it was the same for success of compile...

[wysota]

Is it #include "mainform.h" the problems?

Probably yes.

I need take it here...

No you don't. Do you use methods defined there?

But wich is different between include in implem and in declaration? I thought it was the same for success of compile...

No. You should avoid including to much files in headers, because it slows down the compilation. But the reason of failure might be that qmake sees that it needs that included file in the current file, but that file is included in the other one, so it depends on it and thus it creates a cycle. Of course it might be something different, but you should try removing that include from the header file.

[mickey]

No you don't. Do you use methods defined there?

yes I use members of mainform from here; But if I put it in implementation compile..
[QUOTE=wysota]
No. You should avoid including to much files in headers, because it slows down the compilation. [QUOTE]
including much headers where? from QTdesigner? in implementation? in declarations? Or at begin of file by hand?

thanks

[wysota]

including much headers where? from QTdesigner? in implementation? in declarations? Or at begin of file by hand?

In header files. Because each file which includes that file will also include all the files including it and each time cpp has to parse them. That's why using precompiled headers results in such a big speed gain Parsing header files takes much time.

[mickey]

Sorry but I have some problems with english also. Do you say me to put #incldue much more In implementation or implemention (from qtDesinger).
And is this an help for speed:

#ifndef MYWIDGET_H
#define MYWIDGET_H
.......

#ifndef MYWIDGET_H
#define MYWIDGET_H
.......

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Thanks