How to write generics in C

Explores implementing type-safe generics in C through header instantiation. Compares common approaches (function-like macros, void pointers, macro dispatch) and presents a technique using preprocessor definitions and name mangling. The method instantiates type specializations by defining VEC_ITEM_TYPE and optional VEC_SUFFIX macros, uses a multi-level macro expansion trick for name mangling, and separates forward declarations from implementations via VEC_IMPLEMENTATION guards. Includes a complete generic vector implementation demonstrating struct definitions, push/pop operations, and solutions for redeclaration errors and multiple includes.