public static extern void clang_VirtualFileOverlay_dispose(
     CXVirtualFileOverlayImpl *arg1);
 public static extern CXErrorCode clang_VirtualFileOverlay_setCaseSensitivity(
     CXVirtualFileOverlayImpl *arg1,
     int caseSensitive);
 public static extern CXErrorCode clang_VirtualFileOverlay_writeToBuffer(
     CXVirtualFileOverlayImpl *arg1,
     uint options,
     sbyte **out_buffer_ptr,
     uint *out_buffer_size);
 public static extern CXErrorCode clang_VirtualFileOverlay_addFileMapping(
     CXVirtualFileOverlayImpl *arg1,
     sbyte *virtualPath,
     sbyte *realPath);