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/*
 * Callback function for color buttons' "color-set" signal
 */

template< void (FunctionWidget::*func)(const FunctionColor&) >
void MainWindow::ColorSetter(GtkColorButton* but, MainWindow* win)
{
	static GdkColor gc;
	static FunctionColor fc;
	
	gtk_color_button_get_color(but, &gc);
	fc.set(gc, gtk_color_button_get_alpha(but));
	
	FunctionWidget *w = win->function_widget;
	(w->*func)(fc);
}

/*
 * Create GtkColorButton which will automaticaly set function_widget color
 * using "func" when "color-set" signal is emited
 */

template< void (FunctionWidget::*func)(const FunctionColor&) >
GtkColorButton* MainWindow::createColorButton(const FunctionColor& color, MainWindow* mw)
{
	static GtkColorButton *result;
	static GdkColor gdk_color;
	static guint16 alpha;
	
	color.toGdkColor(gdk_color, alpha);
	result = (GtkColorButton*)gtk_color_button_new_with_color(&gdk_color);
	gtk_color_button_set_use_alpha(result, TRUE);
	gtk_color_button_set_alpha(result, alpha);
	g_signal_connect(G_OBJECT(result), "color-set", G_CALLBACK(ColorSetter<func>), (gpointer)mw); /* GfMainWindow.h:80 hlášený v chybě */
	
	return result;
}

createColorButton<&FunctionWidget::setBgColor>(
	function_widget->getBgColor(),
	this);

src/GfMainWindow.h: In static member function ‘static GtkColorButton* Gf::MainWindow::createColorButton(const Gf::FunctionColor&, Gf::MainWindow*) [with void (Gf::FunctionWidget::* func)(const Gf::FunctionColor&) = &Gf::FunctionWidget::setBgColor]’:
src/GfMainWindow.cpp:97:   instantiated from here
src/GfMainWindow.h:80: error: insufficient contextual information to determine type