c++ - Qt slot, no matching function for call -

c++ - Qt slot, no matching function for call -

i'm quite new qt. wanted create simple application there's triangle generated using opengl , 3 force buttons changing triangle colour.

here's code:

in mainwindow.h declare slots:

public slots: void redbutton(widget w); void greenbutton(widget w); void bluebutton(widget w);

they alter colour using function in widget class:

void mainwindow::redbutton(widget w) { w.setcolor(red); }

in widget.h have:

class widget : public qglwidget { q_object public: widget(qwidget *parent = 0); qsize minimumsizehint() const; qsize sizehint() const; enum color { red, green, bluish }; enum color c; void setcolor(enum color color1); protected: void initializegl(); void paintgl(); void resizegl(int width, int height); };

and function setcolor looks this:

void widget::setcolor(enum color color1) { c = color1; }

unfortunately error saying:

no matching function forr phone call 'widget::setcolor(qpushbutton*&)' w.setcolor(red);

//same goes bluish , greenish don't know i'm doing wrong.

well, function declaration

void widget::setcolor(enum color color1);

obviously doesn't match calls for

void widget::setcolor(qpushbutton*&);

certainly none of qpushbutton instances, establishes valid instance of enum color, compiler errors.

c++ qt opengl