TaskScheduler [5/9] Task Tracker

base/task_scheduler/task_traits.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TASK_SCHEDULER_TASK_TRAITS_H_
 #define BASE_TASK_SCHEDULER_TASK_TRAITS_H_
 
 #include <stdint.h>
 
 #include <iosfwd>
@@ skipping 118 matching lines @@
   // equivalent to the highest priority pending task in the sequence.
   SEQUENCED,
 
   // Executes one task at a time on a single thread in posting order.
   SINGLE_THREADED,
 };
 
 // Pretty Printer for Google Test.
 void BASE_EXPORT PrintTo(const TaskPriority& task_priority, std::ostream* os);
 
+// Stream operator so TaskPriority can be used in assertion statements.

[gab, 2016/03/17 01:42:13]

s/TaskPriority/TaskShutdownBehavior/

(I still don't understand why this is operator<< and TaskPriority is PrintTo()?
Are they not asserted the same way?)

[fdoray, 2016/03/17 20:12:16]

TaskPriority is used in Google Test (EXPECT_EQ) while TaskShutdownBehavior is
used in a DCHECK_NE. Google Test supports both PrintTo and operator<< while
DCHECK supports operator<< only. I changed the code to use operator<< all the
time.

[gab, 2016/03/18 18:48:17]

Got it thanks, the now more consistent approach is less confusing :-).

+BASE_EXPORT std::ostream& operator<<(
+    std::ostream& os,
+    const TaskShutdownBehavior& shutdown_behavior);
+
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_TASK_TRAITS_H_