readme: document Connection::hasError()

drewdzzz · drewdzzz · commit 8e2aaed7a3ee · 2025-04-22T11:17:15.000+03:00
We need to get this method covered because we are going to refer to it
from section describing waiting methods (like `Connector::wait()`).
diff --git a/README.md b/README.md
@@ -156,6 +156,10 @@ if (rc != 0) {
 }
 ```
 
+Note that some methods can return `rc < 0` without any error. For example, `wait`
+can return `-1` when timeout is exceeded. In order to differentiate between such
+situations, one can use method `Connection::hasError()`.
+
 To reset connection after errors (clean up error message and connection status),
 one can use `Connection::reset()`.
 

Original file line number	Diff line number	Diff line change
`@@ -156,6 +156,10 @@ if (rc != 0) {`
`156`	`156`	`}`
`157`	`157`	```
`158`	`158`
	`159`	+Note that some methods can return `rc < 0` without any error. For example, `wait`
	`160`	+can return `-1` when timeout is exceeded. In order to differentiate between such
	`161`	+situations, one can use method `Connection::hasError()`.
	`162`	`+`
`159`	`163`	`To reset connection after errors (clean up error message and connection status),`
`160`	`164`	one can use `Connection::reset()`.
`161`	`165`