MOC adding namespace to class names

问题

I have this very strange problem while compiling the project. MOC seems to be adding a namespace to the class name being moc'ed, although it's not mentioned anywhere in the file/class.

The namespace, however, exists in a library which I use, but it's hidden far away in the header files and I don't use it in the UI files. This is what MOC generates:

const QMetaObject SmpTl::CaptureController::staticMetaObject = {
{ &QObject::staticMetaObject, qt_meta_stringdata_SmpTl__CaptureController,
  qt_meta_data_SmpTl__CaptureController, 0 }};

The SmpTl namespace is not mentioned anywhere in the declaration of CaptureController, but it appears in the MOC-generated .cpp file.

I'm using Visual Studio with the QT integration.

回答1:

SmpTl is the namespace CaptureController is defined in, as it was found by MOC.

The Q_OBJECT macro expands into the declaration of the staticMetaObject-variable inside your class definition (among other things it expands into). The MOC-file contains the definition of that variable.

If this is not correct, please post your Qt version and a stripped down version of your header-file.

回答2:

I also ran into this problem. I had code that looked like this:

namespace foo {
    #ifdef _WIN32
    ...   // This code was fine
    #else
    #error Not Supported
    #endif
}

This confused MOC into thinking namespace foo never closed. Apparently, it didn't know _WIN32 was defined, and got tripped up by the fact that I forgot to put quotes around the error message. Changing it to:

#error "Not Supported"

fixed my problem.

来源：https://stackoverflow.com/questions/2684508/moc-adding-namespace-to-class-names

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c++

compilation

moc