slots and signals don't seem to be recognized

Hello all. :)

I'm very new to Qt but I'm extremely impressed with several aspects of it, especially the documentation.
I'm not an expert programmer (more of a hobbyist), so please feel very free to correct me.

I'm writing a tic-tac-toe game. I've got the game engine itself working, and I'm trying to wrap it up in a nice GUI.

One aspect of the game is going to be a grid of buttons representing the board. When a button is clicked, I want a signal to be emitted witht he coordinates of the button.

Here's what I've got:

Code:

---

#ifndef UISPOT_HPP
#define UISPOT_HPP
 
#include <QPushButton>
#include <QIcon>
 
#include "spot.hpp"
 
namespace ttt {
	class UISpot : public QPushButton {
		Q_OBJECT
		private:
			Spot spot_;
		slots:
			void buttonClicked();
		signals:
			void clickedAt( const Coord &coord );
		public:
			UISpot( const Spot &spot, QWidget *parent ) :
				QPushButton( parent ),
				spot_( spot ) {
				connect( this, SIGNAL( clicked() ),
				         this, SLOT( buttonClicked() ) );
			}
	};
}
 
#endif // UISPOT_HPP

---

And uiSpot.cpp:

Code:

---

#include "uiSpot.hpp"
 
namespace ttt {
	void UISpot::buttonClicked() {
		emit clickedAt( spot_.coord() );
	}
}

---

The Spot interface is irrelevent, so I didn't post it. Now, when I try to compile this, I get the following error messages:

Quote:

---

$ qmake -project
$ qmake
$ make
...
<SNIP>
...
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -I. -o uiSpot.o uiSpot.cpp
uiSpot.hpp:15: error: expected primary-expression before ‘void’
uiSpot.hpp:15: error: ISO C++ forbids declaration of ‘type name’ with no type
uiSpot.hpp:15: error: expected ‘;’ before ‘void’
uiSpot.cpp:4: error: no ‘void ttt::UISpot::buttonClicked()’ member function declared in class ‘ttt::UISpot’
make: *** [uiSpot.o] Error 1

---

At line 15 is where I declare the slots and signals. What am I doing wrong?

Any help would be greatly appreciated. :)

I've never seen 'slots:' in a class without a visibility specification. It might not be the error, but it is worth a try. In your case, I guess that would be 'private slots:'.

Also, you might be interested in auto-connect slots. It's a Qt slot naming convention (on_<object>_<signal>). If you call your slot 'on_this_clicked()', you don't need to explicitly connect.

Quote:

---

Originally Posted by Michiel

I've never seen 'slots:' in a class without a visibility specification. It might not be the error, but it is worth a try. In your case, I guess that would be 'private slots:'.

Also, you might be interested in auto-connect slots. It's a Qt slot naming convention (on_<object>_<signal>). If you call your slot 'on_this_clicked()', you don't need to explicitly connect.

---

Thanks Michiel. The private slots did it. :)