本文 実装例 #include <concepts> #include <cstdio> #include <cstdlib> #include <exception> #include <format> #include <print> #include <ranges> #include <source_location> #include <stacktrace> #include <stdexcept> #include <string_view> namespace kcv { template <typename E> requires std::derived_from<E, s…
