type check error function

include/utils.hpp

@@ -11,3 +11,19 @@ inline void handle_general_error(const std::string &message) {
 }
 
 } // namespace error_handling
+
+namespace utils {
+
+// in std from c++23
+[[noreturn]] inline void unreachable() {
+  // Uses compiler specific extensions if possible.
+  // Even if no extension is used, undefined behavior is still raised by
+  // an empty function body and the noreturn attribute.
+#if defined(_MSC_VER) && !defined(__clang__) // MSVC
+  __assume(false);
+#else // GCC, Clang
+  __builtin_unreachable();
+#endif
+}
+
+} // namespace utils