Type argument of Q_DECLARE_METATYPE(T*) must be fully defined

Ania

In main thread, I created another subthread, and the struct must be transfered to the subthread. Here is my Connect in the main thread:

HeartThreadMsg::HeartThreadRequest threadReqMsg;
threadReqMsg.set_ack_identity(1);
qRegisterMetaType<HeartThreadMsg::HeartThreadRequest>("HeartThreadMsg::HeartThreadRequest");
qRegisterMetaType<struct CDK::RRFramework>("struct CDK::RRFramework");
emit operSig(m_RRFW, threadReqMsg);

m_RRFW is a struct, but it is not fully defined, it defined like this:

namespace CDK
{
      struct RRFramework;
}

when I compile the application, it shows that Type argument of Q_DECLARE_METATYPE(T*) must be fully defined, if I do want to declare the struct, and the struct can not be fully defined, does anyone know how to solve this, or does there has other method?

jsulm

@Ania You need to call qRegisterMetaType somewhere where the struct is fully defined.

SGaist

Hi,

To add to @jsulm, you should use the version of qRegisterMetaType without argument. The one you are using is useful only for registering alias types.

sanojsubran

@jsulm Do you mean in the header, where the struct is defined?

I am also facing the same issue. Any help would be appreciated.

jsulm

@sanojsubran said in Type argument of Q_DECLARE_METATYPE(T*) must be fully defined:

Do you mean in the header, where the struct is defined?

Somewhere in your code where the definition of the struct is known.

SGaist

To add to @jsulm, it's pretty usual to have that macro at the bottom of the header where the class/struct is defined.