STATIC_WARN
summary
When a static_assert would break portability but a compile time warning suffices this shows how to emit one by instantiating a templated warn_if type specialized to use a deprecated attribute and exposing it via a static_warn macro The macro evolves: add a defaulted constructor so it works in expressions then create an anonymous variable using token pasting with __COUNTER__ and __LINE__ so warnings point at the right site Works on GCC and MSVC Caveat do not replace static_assert
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