invalid use of incomplete type 'struct Ogre::ManualObject'

[tokumei]

I'm working with this bit here:

Code: Select all

lWindow -> setAutoUpdated(false);
	{
		Ogre::ManualObject *lManualObject = NULL;
		{
			lManualObject = lScene -> createManualObject("CubeWithAxes");
			lManualObject -> setDynamic(false);
			
			float lSize = 0.7f;
			lManualObject -> begin("BaseWhiteNoLighting", Ogre::RenderOperation::OT_TRIANGLE_LIST);
			{
				lManualObject -> triangle(0,1,2);
				lManualObject -> triangle(2,3,0);
				lManualObject -> triangle(4,6,5);
				lManualObject -> triangle(6,4,7);
			}
			lManualObject -> end();
		}
		Ogre::String lResourceGroup = Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME;
		lManualObject -> convertToMesh("MeshCubeAndAxe");
	}

These are the errors that are returned whenever I try to compile:

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main.cpp: In function 'int main()':
main.cpp:67:18: error: invalid use of incomplete type 'struct Ogre::ManualObject'
/usr/include/OGRE/OgrePrerequisites.h:198:8: error: forward declaration of 'struct Ogre::ManualObject'
main.cpp:70:18: error: invalid use of incomplete type 'struct Ogre::ManualObject'
/usr/include/OGRE/OgrePrerequisites.h:198:8: error: forward declaration of 'struct Ogre::ManualObject'
main.cpp:72:19: error: invalid use of incomplete type 'struct Ogre::ManualObject'
/usr/include/OGRE/OgrePrerequisites.h:198:8: error: forward declaration of 'struct Ogre::ManualObject'
main.cpp:73:19: error: invalid use of incomplete type 'struct Ogre::ManualObject'
/usr/include/OGRE/OgrePrerequisites.h:198:8: error: forward declaration of 'struct Ogre::ManualObject'
main.cpp:74:19: error: invalid use of incomplete type 'struct Ogre::ManualObject'
/usr/include/OGRE/OgrePrerequisites.h:198:8: error: forward declaration of 'struct Ogre::ManualObject'
main.cpp:75:19: error: invalid use of incomplete type 'struct Ogre::ManualObject'
/usr/include/OGRE/OgrePrerequisites.h:198:8: error: forward declaration of 'struct Ogre::ManualObject'
main.cpp:77:18: error: invalid use of incomplete type 'struct Ogre::ManualObject'
/usr/include/OGRE/OgrePrerequisites.h:198:8: error: forward declaration of 'struct Ogre::ManualObject'
main.cpp:80:17: error: invalid use of incomplete type 'struct Ogre::ManualObject'
/usr/include/OGRE/OgrePrerequisites.h:198:8: error: forward declaration of 'struct Ogre::ManualObject'
make: *** [main.o] Error 1

clang might be returning a bit more helpful list of errors:

Code: Select all

main.cpp:67:18: error: member access into incomplete type 'Ogre::ManualObject'
                        lManualObject -> setDynamic(false);
                                      ^
/usr/include/OGRE/OgrePrerequisites.h:198:8: note: forward declaration of 'Ogre::ManualObject'
        class ManualObject;
              ^
main.cpp:70:18: error: member access into incomplete type 'Ogre::ManualObject'
                        lManualObject -> begin("BaseWhiteNoLighting", Ogre::RenderOperation::OT
                                      ^
/usr/include/OGRE/OgrePrerequisites.h:198:8: note: forward declaration of 'Ogre::ManualObject'
        class ManualObject;
              ^
main.cpp:72:19: error: member access into incomplete type 'Ogre::ManualObject'
                                lManualObject -> triangle(0,1,2);
                                              ^
/usr/include/OGRE/OgrePrerequisites.h:198:8: note: forward declaration of 'Ogre::ManualObject'
        class ManualObject;
              ^
main.cpp:73:19: error: member access into incomplete type 'Ogre::ManualObject'
                                lManualObject -> triangle(2,3,0);
                                              ^
/usr/include/OGRE/OgrePrerequisites.h:198:8: note: forward declaration of 'Ogre::ManualObject'
        class ManualObject;
              ^
main.cpp:74:19: error: member access into incomplete type 'Ogre::ManualObject'
                                lManualObject -> triangle(4,6,5);
                                              ^
/usr/include/OGRE/OgrePrerequisites.h:198:8: note: forward declaration of 'Ogre::ManualObject'
        class ManualObject;
              ^
main.cpp:75:19: error: member access into incomplete type 'Ogre::ManualObject'
                                lManualObject -> triangle(6,4,7);
                                              ^
/usr/include/OGRE/OgrePrerequisites.h:198:8: note: forward declaration of 'Ogre::ManualObject'
        class ManualObject;
              ^
main.cpp:77:18: error: member access into incomplete type 'Ogre::ManualObject'
                        lManualObject -> end();
                                      ^
/usr/include/OGRE/OgrePrerequisites.h:198:8: note: forward declaration of 'Ogre::ManualObject'
        class ManualObject;
              ^
main.cpp:80:17: error: member access into incomplete type 'Ogre::ManualObject'
                lManualObject -> convertToMesh("MeshCubeAndAxe");
                              ^
/usr/include/OGRE/OgrePrerequisites.h:198:8: note: forward declaration of 'Ogre::ManualObject'
        class ManualObject;

It seems like commenting out setDynamic and everything after it (while still being inside of the curly brace) seems to remove the errors. However, I need to use setDynamic because I want to manually set the geometry.

Thanks for any help!

[Klaim]

Simple: the header you included use forward declarations of ManualObject, so the compiler knows there is a type that is called like that, but it don't have it's full definition, only it's name.

You simply need to include OgreManualObject.h (if that's the correct header name).
Then the compiler will be able to use the type's member.

If you don't understand forward declaration, you should try to learn about it, it's very useful but it gets you in this kind of case easily too.

[jacmoe]

And you need to include the ManualObject header in the implementation file, cpp.
Not in the header. (Because it nulls the advantage of forward declarations)