我有一个类,我想在Qvariant中使用它,因此我需要声明并注册Meta类型。这就是我所做的:
class blabla: public QThread
{
Q_OBJECT
.
.
.
};
Q_DECLARE_METATYPE(blabla)
但是这段代码给了我错误:
In copy constructor ‘QThread::QThread(const QThread&)’:
instantiated from ‘void* qMetaTypeConstructHelper(const T*) [with T = blabla]’
instantiated from ‘int qRegisterMetaType(const char*, T*) [with T = blabla]’
instantiated from here
‘QObject::QObject(const QObject&)’ is private
within this context
In file included from UnitTest.cpp:16:0:
blabla.h: In copy constructor ‘blabla::blabla(const blabla&)’:
note: synthesized method ‘QThread::QThread(const QThread&)’ first required here
In file included from /usr/include/QtCore/qvariant.h:48:0,
from /usr/include/QtCore/qabstractitemmodel.h:45,
from /usr/include/QtCore/QtCore:7,
from /usr/include/QtTest/QtTest:3,
from UnitTest.h:16,
from UnitTest.cpp:14:
In function ‘void* qMetaTypeConstructHelper(const T*) [with T = blabla]’:
note: synthesized method ‘blabla::blabla(const blabla&)’ first required here
make[1]: *** [build/obj/UnitTest.o] Error 1
我想我需要注册我的met-type,但我不知道在哪里qRegisterMetaType<MyClass>("MyClass");
。我尝试在元类型声明宏之后使用它,但导致错误。任何引导我走向正确道路的评论或暗示。
答案 0 :(得分:19)
将对象放入QVariant
时复制,但无法复制QObject
派生类,因此解决方案是使用指向类的指针。
Q_DECLARE_METATYPE( blabla* )
只有通过排队的信号/插槽连接发送对象时才需要qRegisterMetaType<T>()
。