libcamera: v4l2_subdevice: Replace Routing::toString() with operator<<()

The main (and only at the moment) use case for the Routing::toString()
function is to print a representation of the routing table in a log
message. The function is implemented using an std::stringstream, and the
returned std::string is then inserted into an std::ostream. This is
inefficient. Replace the function with a specialization of the
operator<<() and use it in the caller.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index 3d042496..feea26fd 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -1388,7 +1388,7 @@ int SimplePipelineHandler::resetRoutingTable(V4L2Subdevice *subdev)
 
 	LOG(SimplePipeline, Debug)
 		<< "Routing table of " << subdev->deviceNode()
-		<< " reset to " << routing.toString();
+		<< " reset to " << routing;
 
 	return 0;
 }