What are the C++23 features for safety and security?

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C++23 adds several safety features. **std::stacktrace** — debugging: ```cpp #include auto st = std::stacktrace::current(); std::cout << st; // Print call stack ``` **std::expected** — error handling: ```cpp std::expected parse(const std::string& s); auto result = parse("42"); if (result) std::cout << *result; ``` **Deduping this** — prevent dangling: ```cpp class Foo { auto bar() const { return *this; } // Deduced this }; ``` **if consteval** — compile-time check: ```cpp constexpr int process(int x) { if consteval { return x * 2; } else { return x * 3; } } ``` **std::unreachable** — optimization: ```cpp if (impossible) { std::unreachable(); // UB if reached } ``` **Benefits:** - Better debugging. - Safer error handling. - More optimizations.

C++: What are the C++23 features for safety and security?