在C

Compiler Restriction

The compiler's restriction against forward declaring typedefs stems from the fact that typedefs create aliases for existing types. To resolve the alias, the compiler must have access to the underlying type's definition during compilation.

Best Practice for Managing Inclusion Tree

In cases where it is impossible to forward declare a typedef, the best practice is to minimize the inclusion tree, which refers to the chain of header files included by your source code.這可以通過：

很有選擇性：

的：

的：

Splitting Headers into Modules:

Break down large header files into smaller modules, each focusing on a specific aspect of your code.

1. Forward Declaring Classes: For class types, consider forward declaring them in the header file and defining them in a separate source file。 forrof typeDefs
class a; typedef a b;
2. 通過遵循這些最佳實踐，您可以減少包含樹的大小並提高C代碼彙編的效率。