sdbus++: async: client: move context to constructor

The async::context is needed for every client invocation, since that
is how the async task is generated.  Rather than pass it in as a
parameter on each function invocation, add it as a constructor to the
client-proxy object.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic1c8ec2260b7d4774649de9559df466058a50e14
diff --git a/example/calculator-client.cpp b/example/calculator-client.cpp
index 78c8880..56e9fb4 100644
--- a/example/calculator-client.cpp
+++ b/example/calculator-client.cpp
@@ -8,35 +8,35 @@
     constexpr auto service = "net.poettering.Calculator";
     constexpr auto path = "/net/poettering/calculator";
 
-    auto c =
-        sdbusplus::client::net::poettering::Calculator().service(service).path(
-            path);
+    auto c = sdbusplus::client::net::poettering::Calculator(ctx)
+                 .service(service)
+                 .path(path);
 
     // Alternatively, sdbusplus::async::client_t<Calculator, ...>() could have
     // been used to combine multiple interfaces into a single client-proxy.
 
     {
-        auto _ = co_await c.multiply(ctx, 7, 6);
+        auto _ = co_await c.multiply(7, 6);
         std::cout << "Should be 42: " << _ << std::endl;
     }
 
     {
-        auto _ = co_await c.get_property<int64_t>(ctx, "LastResult");
+        auto _ = co_await c.get_property<int64_t>("LastResult");
         std::cout << "Should be 42: " << _ << std::endl;
     }
 
     {
-        co_await c.clear(ctx);
+        co_await c.clear();
     }
 
     {
-        auto _ = co_await c.get_property<int64_t>(ctx, "LastResult");
+        auto _ = co_await c.get_property<int64_t>("LastResult");
         std::cout << "Should be 0: " << _ << std::endl;
     }
 
     {
-        co_await c.set_property<int64_t>(ctx, "LastResult", 1234);
-        auto _ = co_await c.get_property<int64_t>(ctx, "LastResult");
+        co_await c.set_property<int64_t>("LastResult", 1234);
+        auto _ = co_await c.get_property<int64_t>("LastResult");
         std::cout << "Should be 1234: " << _ << std::endl;
     }