sdbus++: async: server: generate method-call fn

Add binding generation for method-call functions.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I34ac44ae0cdb43a18b96a4ddc5e67df4971da939
diff --git a/example/calculator-aserver.cpp b/example/calculator-aserver.cpp
index 149da86..6dc8579 100644
--- a/example/calculator-aserver.cpp
+++ b/example/calculator-aserver.cpp
@@ -28,6 +28,27 @@
         return false;
     }
 
+    auto method_call(multiply_t, auto x, auto y)
+    {
+        auto r = x * y;
+        last_result(r);
+        return r;
+    }
+
+    auto method_call(divide_t, auto x, auto y)
+        -> sdbusplus::async::task<divide_t::return_type>
+    {
+        auto r = x / y;
+        last_result(r);
+        co_return r;
+    }
+
+    auto method_call(clear_t) -> sdbusplus::async::task<>
+    {
+        last_result(0);
+        co_return;
+    }
+
   private:
     auto startup() -> sdbusplus::async::task<>
     {
@@ -36,7 +57,7 @@
 
         status(State::Error);
 
-        while (1)
+        while (!ctx.stop_requested())
         {
             using namespace std::literals;
             co_await sdbusplus::async::sleep_for(ctx, 10s);