avoid lambda to simplify source code

README.md

@@ -425,10 +425,14 @@ produce the `int64_t` alternative and unsigned definitions produce the `uint64_t
 alternative. Raw values remain exact across their full 64-bit ranges. Check
 `valid` before using the value; an invalid result's default value is not decoded data.
 
-Use `std::get` when the numeric type is known, or `std::visit` to handle both:
+Use `std::get` when the numeric type is known, or `std::get_if` to handle both:
 
 ```cpp
-std::visit([] (auto raw) { std::cout << raw; }, decodedSignal.rawValue);
+if (const auto *value = std::get_if<std::int64_t>(&decodedSignal.rawValue)) {
+    std::cout << *value;
+} else {
+    std::cout << std::get<std::uint64_t>(decodedSignal.rawValue);
+}
 ```
 
 This replaces the previous `int64_t` field: consumers that read or print