<< Re-reading header files >>

• C++ inline functions and templates are typically in headers.
• Compilation time is often dominated by header files.
  • Assume a top-level files on average includes N headers.
  • Then compiling M files has to process M*N headers.
• This motivates pre-compiled header (PCH) files.
• A server can give us comparable benefits, if we can re-use header files.
• This might be easier and more flexible than PCH.