Shortening C++ Compilation Times

A few of many things a programmer should care about.

• Forward Declarations

  Use forward declarations wherever applicable.

• Clean Unused Includes

  Clean up unused includes. Tools like Resharper C++ or Rider IDE highlights unused includes in the opened source file.

• Use Lowest Possible Class in Hierarchy

  Use "the lowest possible class in the hierarchy", i.e. include engine's PlayerController.h instead of your extended version if you don't need anything from your overridden class.

• Put Common Types into Separate Headers

  Put common types (enums, structs) into separate headers like "MyProjectTypes.h" or "InventoryTypes.h". This way you wouldn't have to include the entire InventoryComponent class when another class just needs a struct holding InventoryItem definition. So you don't add classes used by InventoryComponent to the dependency chain

• Minimize Dependency

  Don't forget about proper code architecture. Think all the time how to minimize dependencies between classes and systems.