fixup clang warning (#1040)

wjwwood · web-flow · commit efa47546ab45 · 2020-03-31T09:00:09.000-07:00
Signed-off-by: William Woodall &lt;william@osrfoundation.org&gt;
diff --git a/rclcpp/include/rclcpp/strategies/allocator_memory_strategy.hpp b/rclcpp/include/rclcpp/strategies/allocator_memory_strategy.hpp
@@ -194,7 +194,7 @@ class AllocatorMemoryStrategy : public memory_strategy::MemoryStrategy
     return has_invalid_weak_nodes;
   }
 
-  void add_waitable_handle(const rclcpp::Waitable::SharedPtr & waitable)
+  void add_waitable_handle(const rclcpp::Waitable::SharedPtr & waitable) override
   {
     if (nullptr == waitable) {
       throw std::runtime_error("waitable object unexpectedly nullptr");

Original file line number	Diff line number	Diff line change
`@@ -194,7 +194,7 @@ class AllocatorMemoryStrategy : public memory_strategy::MemoryStrategy`
`194`	`194`	`return has_invalid_weak_nodes;`
`195`	`195`	`}`
`196`	`196`
`197`		`- void add_waitable_handle(const rclcpp::Waitable::SharedPtr & waitable)`
	`197`	`+ void add_waitable_handle(const rclcpp::Waitable::SharedPtr & waitable) override`
`198`	`198`	`{`
`199`	`199`	`if (nullptr == waitable) {`
`200`	`200`	`throw std::runtime_error("waitable object unexpectedly nullptr");`