Example CP.4 (task vs thread)

Author: luav

CppCoreGuidelines.md

@@ -13393,8 +13393,29 @@ Application concepts are easier to reason about.
 
 ##### Example
 
-    ???
-
+    void publish(std::string* msg)
+    {
+        // ...
+        *msg = "Hello";
+        // ...
+    }
+    
+    void manual_publishing(std::string* msg)
+    {
+	    // Incapsulates thread functionality into the application task
+        std::thread publisher(publish, &msg);
+        publisher.join();
+    }
+    
+    void some_fun() {
+        std::string  msg;
+        std::thread publisher(publish, &msg);     // bad (less expressive and more error-prone)
+        auto pubtask = std::sync(publish, &msg);  // OK
+        manual_publishing(&msg);                  // OK (manually crafted task)
+        // ...
+        publisher.join();
+    }
+    
 ##### Note
 
 With the exception of `async()`, the standard-library facilities are low-level, machine-oriented, threads-and-lock level.