Guide View c++ SDK

Hi,

I'm using the native c++ SDK and I want to display the guide view on the screen.

I try the code of "Render the Guide View" part found on the page https://library.vuforia.com/content/vuforia-library/en/articles/Solution/model-targets-workflow.html.

But I can't find "Myapp" class . So the lines

"textureId = MyApp::createTexture(const_cast(guideView - > getImage()));"

and :

 "MyApp::renderRectangleTextured(scale, color, textureId);"

don't work.

Can't you help me found the "Myapp" class or provide me the body of these two functions.

Thank you a lot.