Stefan Haller

``` foo.hpp: class foo { }; --- foo_fwd.hpp: class foo; --- baz.hpp: #include "foo.hpp" // do_something_with_foo --- main1.cpp: #include "foo_fwd.hpp" // works void x(foo&); --- main2.cpp: #include "foo.hpp" #include "foo_fwd.hpp"...

We have a number of "umbrella headers" in our code base; these are headers that don't provide anything themselves, but only include other headers which are not supposed to be...