Reland "Add base::TimeDelta::Max()"

base/time/time.cc

 // Copyright (c) 2012 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 "base/time/time.h"
 
 #include <limits>
 #include <ostream>
 
 #include "base/float_util.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/third_party/nspr/prtime.h"
 #include "base/third_party/nspr/prtypes.h"
 
 namespace base {
 
 // TimeDelta ------------------------------------------------------------------
 
+// static
+TimeDelta TimeDelta::Max() {
+  return TimeDelta(std::numeric_limits<int64>::max());
+}
+
 int TimeDelta::InDays() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int>::max();
+  }
   return static_cast<int>(delta_ / Time::kMicrosecondsPerDay);
 }
 
 int TimeDelta::InHours() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int>::max();
+  }
   return static_cast<int>(delta_ / Time::kMicrosecondsPerHour);
 }
 
 int TimeDelta::InMinutes() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int>::max();
+  }
   return static_cast<int>(delta_ / Time::kMicrosecondsPerMinute);
 }
 
 double TimeDelta::InSecondsF() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<double>::infinity();
+  }
   return static_cast<double>(delta_) / Time::kMicrosecondsPerSecond;
 }
 
 int64 TimeDelta::InSeconds() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int64>::max();
+  }
   return delta_ / Time::kMicrosecondsPerSecond;
 }
 
 double TimeDelta::InMillisecondsF() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<double>::infinity();
+  }
   return static_cast<double>(delta_) / Time::kMicrosecondsPerMillisecond;
 }
 
 int64 TimeDelta::InMilliseconds() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int64>::max();
+  }
   return delta_ / Time::kMicrosecondsPerMillisecond;
 }
 
 int64 TimeDelta::InMillisecondsRoundedUp() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int64>::max();
+  }
   return (delta_ + Time::kMicrosecondsPerMillisecond - 1) /
       Time::kMicrosecondsPerMillisecond;
 }
 
 int64 TimeDelta::InMicroseconds() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int64>::max();
+  }
   return delta_;
 }
 
 // Time -----------------------------------------------------------------------
 
 // static
 Time Time::Max() {
   return Time(std::numeric_limits<int64>::max());
 }
 
@@ skipping 159 matching lines @@
   return is_in_range(month, 1, 12) &&
          is_in_range(day_of_week, 0, 6) &&
          is_in_range(day_of_month, 1, 31) &&
          is_in_range(hour, 0, 23) &&
          is_in_range(minute, 0, 59) &&
          is_in_range(second, 0, 60) &&
          is_in_range(millisecond, 0, 999);
 }
 
 }  // namespace base