libcamera: request: Add operator<<()

With the recent addition of operator<<() in most libcamera core classes
to replace usage of the toString() function the Request class was left
behind.

Add operator<<() for the Request class and reimplement toString().

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/internal/request.h

@@ -44,6 +44,7 @@ public:
 
 private:
 	friend class PipelineHandler;
+	friend std::ostream &operator<<(std::ostream &out, const Request &r);
 
 	void doCancelRequest();
 	void emitPrepareCompleted();

include/libcamera/request.h

@@ -9,6 +9,7 @@
 
 #include <map>
 #include <memory>
+#include <ostream>
 #include <stdint.h>
 #include <string>
 #include <unordered_set>
@@ -75,4 +76,6 @@ private:
 	Status status_;
 };
 
+std::ostream &operator<<(std::ostream &out, const Request &r);
+
 } /* namespace libcamera */

src/libcamera/request.cpp

@@ -582,16 +582,28 @@ bool Request::hasPendingBuffers() const
 std::string Request::toString() const
 {
 	std::stringstream ss;
-
-	/* Pending, Completed, Cancelled(X). */
-	static const char *statuses = "PCX";
-
-	/* Example Output: Request(55:P:1/2:6523524) */
-	ss << "Request(" << sequence() << ":" << statuses[status_] << ":"
-	   << _d()->pending_.size() << "/" << bufferMap_.size() << ":"
-	   << cookie_ << ")";
+	ss << *this;
 
 	return ss.str();
 }
 
+/**
+ * \brief Insert a text representation of a Request into an output stream
+ * \param[in] out The output stream
+ * \param[in] r The Request
+ * \return The output stream \a out
+ */
+std::ostream &operator<<(std::ostream &out, const Request &r)
+{
+	/* Pending, Completed, Cancelled(X). */
+	static const char *statuses = "PCX";
+
+	/* Example Output: Request(55:P:1/2:6523524) */
+	out << "Request(" << r.sequence() << ":" << statuses[r.status()] << ":"
+	    << r._d()->pending_.size() << "/" << r.buffers().size() << ":"
+	    << r.cookie() << ")";
+
+	return out;
+}
+
 } /* namespace libcamera */