I SPY with my little eye Boost.Predef in a constexpr world
summary
A tiny library called spy provides a constexpr-compatible Boost.Predef clone that exposes objects like spy::gcc and spy::os so code can write if constexpr tests against compiler, platform, and feature versions. It discovers that plain if constexpr still parses unused branches so it adds patterns using templates and concepts to avoid ill-formed code, and offers a runtime CPUID wrapper for CPU feature detection. The crate is rough but practical and compiles in real projects.
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chapters (4)
- 0:00Modern C++ and macros
- 0:31Introducing the spy library
- 2:15Limitations of constexpr
- 4:42Future potential and closing
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