Compile-Time Counter Using Template & Constexpr Magic
summary
A zero-overhead compile-time counter implemented with templates, constexpr and overload resolution that auto-increments via chained static methods triggered from a class default initializer; it uses a templated integer wrapper and decltype trick so decltype(expression) sees newly declared overloads during class completion. Registration is emitted by macros into CS registerN calls, optimized by clang into a single tail-call sequence (tail-call optimized) while GCC leaves distinct functions; works within C++11, has a 255 wrapper limit on clang unless adjusted.
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