Newline between precompiled header include and C++ library includes; we'll put the ``#include stdafx.hpp`` in the same category as the header corresponding to the cpp, e.g., in bar/foo.cpp,
```cpp
#include "stdafx.hpp"
#include "bar/foo.hpp"

#include <string>
#include <functional>

#include "baz/foobar.hpp"
// ...
```