std::variant & Blockchain
summary
Claims that std::variant replaces Boost.Variant/optional to simplify blockchain verification interfaces, showing concrete header excerpts and source links at http://cppnow.org/history/2019/talks/. Demonstrates using C++17 metaprogramming and compile-time polymorphism for verification to build a cache that stores strong and weak pointers and a tuple helper that removes manual index code. Result: fewer external dependencies, tighter compile-time type dispatch, presented as working example code rather than abstract promises.
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