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Organize code to minimize header dependencies and improve compilation times. Use forward declarations instead of includes when possible, avoid unnecessary dependencies, and follow proper header organization patterns.

Key practices:

• Use forward declarations in headers when you only need to declare pointers or references to a type
• Implementation files (.cpp) should contain the actual includes, while headers (.h) should minimize dependencies
• Avoid including heavy headers when lighter alternatives exist
• Never use static declarations in header files as they create separate instances in each translation unit
• Organize includes to separate interface declarations from implementation dependencies

Example:

// Good: Use forward declaration in header
// MyClass.h
class WarnUnusedResultAttr; // Forward declaration
class MyClass {
  WarnUnusedResultAttr* attr;
};

// MyClass.cpp - actual include in implementation
#include "clang/AST/Attr.h"

// Bad: Heavy include in header
// MyClass.h  
#include "clang/AST/Attr.h" // Unnecessary dependency

This approach reduces compilation times, minimizes rebuild cascades when headers change, and creates cleaner module boundaries.