QFont error on compile time
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What I want to have is for each custom text object to have it's only QFont. Why is this not allowed in the header file or in a constructor?
QFont font;Error given is:
element.cpp:37:107: error: variable has incomplete type 'QFont'
qmetatype.h:2090:1: note: forward declaration of 'QFont'
qmetatype.h:155:18: note: expanded from macro 'QT_FOR_EACH_STATIC_GUI_CLASS'Why is this allowed?
QFont* font; -
What I want to have is for each custom text object to have it's only QFont. Why is this not allowed in the header file or in a constructor?
QFont font;Error given is:
element.cpp:37:107: error: variable has incomplete type 'QFont'
qmetatype.h:2090:1: note: forward declaration of 'QFont'
qmetatype.h:155:18: note: expanded from macro 'QT_FOR_EACH_STATIC_GUI_CLASS'Why is this allowed?
QFont* font;@jkwok678
For a start you need to#include <QFont>to allow forQFont f.OTOH, it's enough to go
class QFont;, with no#include, to be allowed to goQFont *f.My guess is your order of includes put you in the second situation, doubtless from the
qmetatype.h:2090:1: note: forward declaration of 'QFont' -
@jkwok678 said in QFont error on compile time:
Why is this allowed?
C++ basics - the compiler needs to know the size of the type when it sees it. Since the size of a pointer is known, forward declaring a pointer is possible.
