...

examples/device_exam.cpp

@@ -20,6 +20,8 @@ int main()
         },
         std::tuple<double, long>{});
 
+    dev.addAttr("2", [&d]() -> adc_result_t<double> { return d; }, nullptr);
+
     adc_result_t<int> ri = dev["1"];
     if (ri) {
         std::println("dev[1] = {}", ri.value());
@@ -39,5 +41,17 @@ int main()
         std::println("cannot get dev[1] as double: {}", rd.error().message());
     }
 
+    ri = dev["1"];
+    if (ri) {
+        std::println("dev[1] = {}", ri.value());
+    } else {
+        std::println("cannot get dev[1] as int: {}", ri.error().message());
+    }
+
+    err = dev["2"] = 0.29817;
+    if (err) {
+        std::println("cannot set dev[2] as double: {}", err.message());
+    }
+
     return 0;
 }