The Preprocessor: Everything You Need to Know and More!
summary
Preprocessor remains a text‑replacement engine that actually pastes headers into a translation unit (see -E preprocessor dump or Compiler Explorer to inspect .i output), inherited from C but diverging in C++ with modules still not ubiquitous. The talk demonstrates concrete pitfalls: directives have no scope, conditionals treat identifiers as numeric, double-evaluation in function-like macros causes side‑effects, and pragma pack push/pop can silently break serialization unless paired with pop. Practical tools and alternatives shown: __VA_OPT__ caveats, _Generic for C, constexpr/templates/source_location for C++ and use pragmas sparingly.
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chapters (5)
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