Type conversion fixes, crypto/ edition.

crypto/nss_util_unittest.cc

 // Copyright (c) 2011 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.
 
 #include "crypto/nss_util.h"
 
 #include <prtime.h>
 
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace crypto {
 
 TEST(NSSUtilTest, PRTimeConversion) {
   EXPECT_EQ(base::Time::UnixEpoch(), PRTimeToBaseTime(0));
   EXPECT_EQ(0, BaseTimeToPRTime(base::Time::UnixEpoch()));
 
   PRExplodedTime prxtime;
   prxtime.tm_params.tp_gmt_offset = 0;
   prxtime.tm_params.tp_dst_offset = 0;
   base::Time::Exploded exploded;
-  prxtime.tm_year = exploded.year = 2011;
+  exploded.year = prxtime.tm_year = 2011;
   exploded.month = 12;
   prxtime.tm_month = 11;
-  prxtime.tm_wday = exploded.day_of_week = 0;  // Should be unusued.
-  prxtime.tm_mday = exploded.day_of_month = 10;
-  prxtime.tm_hour = exploded.hour = 2;
-  prxtime.tm_min = exploded.minute = 52;
-  prxtime.tm_sec = exploded.second = 19;
+  // PRExplodedTime::tm_wday is a smaller type than Exploded::day_of_week, so
+  // assigning the two in this order instead of the reverse avoids potential
+  // warnings about type downcasting.
+  exploded.day_of_week = prxtime.tm_wday = 0;  // Should be unused.
+  exploded.day_of_month = prxtime.tm_mday = 10;
+  exploded.hour = prxtime.tm_hour = 2;
+  exploded.minute = prxtime.tm_min = 52;
+  exploded.second = prxtime.tm_sec = 19;
   exploded.millisecond = 342;
   prxtime.tm_usec = 342000;
 
   PRTime pr_time = PR_ImplodeTime(&prxtime);
   base::Time base_time = base::Time::FromUTCExploded(exploded);
 
   EXPECT_EQ(base_time, PRTimeToBaseTime(pr_time));
   EXPECT_EQ(pr_time, BaseTimeToPRTime(base_time));
 }
 
 }  // namespace crypto