494 lines
15 KiB
C++
494 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Time represents an absolute point in time, internally represented as
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// microseconds (s/1,000,000) since a platform-dependent epoch. Each
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// platform's epoch, along with other system-dependent clock interface
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// routines, is defined in time_PLATFORM.cc.
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//
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// TimeDelta represents a duration of time, internally represented in
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// microseconds.
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//
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// TimeTicks represents an abstract time that is always incrementing for use
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// in measuring time durations. It is internally represented in microseconds.
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// It can not be converted to a human-readable time, but is guaranteed not to
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// decrease (if the user changes the computer clock, Time::Now() may actually
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// decrease or jump).
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//
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// These classes are represented as only a 64-bit value, so they can be
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// efficiently passed by value.
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#ifndef BASE_TIME_H_
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#define BASE_TIME_H_
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#include <time.h>
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#include "base/basictypes.h"
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#ifdef OS_WIN
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// For FILETIME in FromFileTime, until it moves to a new converter class.
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// See TODO(iyengar) below.
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#include <windows.h>
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#endif
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namespace base {
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class Time;
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class TimeTicks;
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// This unit test does a lot of manual time manipulation.
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class PageLoadTrackerUnitTest;
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// TimeDelta ------------------------------------------------------------------
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class TimeDelta {
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public:
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TimeDelta() : delta_(0) {
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}
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// Converts units of time to TimeDeltas.
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static TimeDelta FromDays(int64_t days);
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static TimeDelta FromHours(int64_t hours);
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static TimeDelta FromMinutes(int64_t minutes);
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static TimeDelta FromSeconds(int64_t secs);
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static TimeDelta FromMilliseconds(int64_t ms);
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static TimeDelta FromMicroseconds(int64_t us);
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// Returns the internal numeric value of the TimeDelta object. Please don't
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// use this and do arithmetic on it, as it is more error prone than using the
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// provided operators.
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int64_t ToInternalValue() const {
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return delta_;
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}
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#ifdef OS_SOLARIS
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struct timespec ToTimeSpec() const;
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#endif
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// Returns the time delta in some unit. The F versions return a floating
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// point value, the "regular" versions return a rounded-down value.
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int InDays() const;
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int InHours() const;
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int InMinutes() const;
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double InSecondsF() const;
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int64_t InSeconds() const;
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double InMillisecondsF() const;
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int64_t InMilliseconds() const;
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int64_t InMicroseconds() const;
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TimeDelta& operator=(TimeDelta other) {
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delta_ = other.delta_;
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return *this;
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}
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// Computations with other deltas.
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TimeDelta operator+(TimeDelta other) const {
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return TimeDelta(delta_ + other.delta_);
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}
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TimeDelta operator-(TimeDelta other) const {
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return TimeDelta(delta_ - other.delta_);
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}
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TimeDelta& operator+=(TimeDelta other) {
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delta_ += other.delta_;
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return *this;
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}
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TimeDelta& operator-=(TimeDelta other) {
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delta_ -= other.delta_;
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return *this;
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}
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TimeDelta operator-() const {
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return TimeDelta(-delta_);
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}
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// Computations with ints, note that we only allow multiplicative operations
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// with ints, and additive operations with other deltas.
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TimeDelta operator*(int64_t a) const {
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return TimeDelta(delta_ * a);
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}
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TimeDelta operator/(int64_t a) const {
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return TimeDelta(delta_ / a);
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}
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TimeDelta& operator*=(int64_t a) {
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delta_ *= a;
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return *this;
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}
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TimeDelta& operator/=(int64_t a) {
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delta_ /= a;
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return *this;
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}
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int64_t operator/(TimeDelta a) const {
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return delta_ / a.delta_;
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}
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// Defined below because it depends on the definition of the other classes.
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Time operator+(Time t) const;
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TimeTicks operator+(TimeTicks t) const;
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// Comparison operators.
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bool operator==(TimeDelta other) const {
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return delta_ == other.delta_;
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}
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bool operator!=(TimeDelta other) const {
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return delta_ != other.delta_;
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}
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bool operator<(TimeDelta other) const {
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return delta_ < other.delta_;
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}
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bool operator<=(TimeDelta other) const {
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return delta_ <= other.delta_;
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}
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bool operator>(TimeDelta other) const {
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return delta_ > other.delta_;
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}
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bool operator>=(TimeDelta other) const {
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return delta_ >= other.delta_;
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}
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private:
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friend class Time;
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friend class TimeTicks;
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friend TimeDelta operator*(int64_t a, TimeDelta td);
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// Constructs a delta given the duration in microseconds. This is private
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// to avoid confusion by callers with an integer constructor. Use
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// FromSeconds, FromMilliseconds, etc. instead.
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explicit TimeDelta(int64_t delta_us) : delta_(delta_us) {
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}
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// Delta in microseconds.
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int64_t delta_;
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};
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inline TimeDelta operator*(int64_t a, TimeDelta td) {
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return TimeDelta(a * td.delta_);
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}
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// Time -----------------------------------------------------------------------
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// Represents a wall clock time.
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class Time {
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public:
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static const int64_t kMillisecondsPerSecond = 1000;
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static const int64_t kMicrosecondsPerMillisecond = 1000;
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static const int64_t kMicrosecondsPerSecond = kMicrosecondsPerMillisecond *
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kMillisecondsPerSecond;
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static const int64_t kMicrosecondsPerMinute = kMicrosecondsPerSecond * 60;
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static const int64_t kMicrosecondsPerHour = kMicrosecondsPerMinute * 60;
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static const int64_t kMicrosecondsPerDay = kMicrosecondsPerHour * 24;
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static const int64_t kMicrosecondsPerWeek = kMicrosecondsPerDay * 7;
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static const int64_t kNanosecondsPerMicrosecond = 1000;
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static const int64_t kNanosecondsPerSecond = kNanosecondsPerMicrosecond *
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kMicrosecondsPerSecond;
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// Represents an exploded time that can be formatted nicely. This is kind of
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// like the Win32 SYSTEMTIME structure or the Unix "struct tm" with a few
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// additions and changes to prevent errors.
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struct Exploded {
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int year; // Four digit year "2007"
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signed char month; // 1-based month (values 1 = January, etc.)
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signed char day_of_week; // 0-based day of week (0 = Sunday, etc.)
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signed char day_of_month; // 1-based day of month (1-31)
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signed char hour; // Hour within the current day (0-23)
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signed char minute; // Minute within the current hour (0-59)
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signed char second; // Second within the current minute (0-59 plus
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// leap seconds which may take it up to 60).
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int millisecond; // Milliseconds within the current second (0-999)
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};
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// Contains the NULL time. Use Time::Now() to get the current time.
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explicit Time() : us_(0) {
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}
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// Returns true if the time object has not been initialized.
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bool is_null() const {
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return us_ == 0;
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}
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// Returns the current time. Watch out, the system might adjust its clock
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// in which case time will actually go backwards. We don't guarantee that
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// times are increasing, or that two calls to Now() won't be the same.
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static Time Now();
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// Returns the current time. Same as Now() except that this function always
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// uses system time so that there are no discrepancies between the returned
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// time and system time even on virtual environments including our test bot.
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// For timing sensitive unittests, this function should be used.
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static Time NowFromSystemTime();
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// Converts to/from time_t in UTC and a Time class.
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// TODO(brettw) this should be removed once everybody starts using the |Time|
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// class.
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static Time FromTimeT(time_t tt);
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time_t ToTimeT() const;
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// Converts time to/from a double which is the number of seconds since epoch
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// (Jan 1, 1970). Webkit uses this format to represent time.
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static Time FromDoubleT(double dt);
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double ToDoubleT() const;
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#ifdef OS_SOLARIS
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struct timeval ToTimeVal() const;
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#endif
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#ifdef OS_WIN
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static Time FromFileTime(FILETIME ft);
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FILETIME ToFileTime() const;
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#endif
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// Converts an exploded structure representing either the local time or UTC
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// into a Time class.
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static Time FromUTCExploded(const Exploded& exploded) {
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return FromExploded(false, exploded);
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}
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static Time FromLocalExploded(const Exploded& exploded) {
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return FromExploded(true, exploded);
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}
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// Converts an integer value representing Time to a class. This is used
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// when deserializing a |Time| structure, using a value known to be
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// compatible. It is not provided as a constructor because the integer type
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// may be unclear from the perspective of a caller.
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static Time FromInternalValue(int64_t us) {
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return Time(us);
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}
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// Converts a string representation of time to a Time object.
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// An example of a time string which is converted is as below:-
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// "Tue, 15 Nov 1994 12:45:26 GMT". If the timezone is not specified
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// in the input string, we assume local time.
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// TODO(iyengar) Move the FromString/FromTimeT/ToTimeT/FromFileTime to
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// a new time converter class.
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static bool FromString(const wchar_t* time_string, Time* parsed_time);
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// For serializing, use FromInternalValue to reconstitute. Please don't use
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// this and do arithmetic on it, as it is more error prone than using the
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// provided operators.
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int64_t ToInternalValue() const {
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return us_;
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}
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// Fills the given exploded structure with either the local time or UTC from
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// this time structure (containing UTC).
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void UTCExplode(Exploded* exploded) const {
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return Explode(false, exploded);
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}
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void LocalExplode(Exploded* exploded) const {
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return Explode(true, exploded);
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}
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// Rounds this time down to the nearest day in local time. It will represent
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// midnight on that day.
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Time LocalMidnight() const;
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Time& operator=(Time other) {
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us_ = other.us_;
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return *this;
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}
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// Compute the difference between two times.
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TimeDelta operator-(Time other) const {
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return TimeDelta(us_ - other.us_);
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}
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// Modify by some time delta.
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Time& operator+=(TimeDelta delta) {
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us_ += delta.delta_;
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return *this;
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}
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Time& operator-=(TimeDelta delta) {
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us_ -= delta.delta_;
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return *this;
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}
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// Return a new time modified by some delta.
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Time operator+(TimeDelta delta) const {
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return Time(us_ + delta.delta_);
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}
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Time operator-(TimeDelta delta) const {
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return Time(us_ - delta.delta_);
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}
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// Comparison operators
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bool operator==(Time other) const {
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return us_ == other.us_;
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}
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bool operator!=(Time other) const {
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return us_ != other.us_;
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}
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bool operator<(Time other) const {
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return us_ < other.us_;
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}
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bool operator<=(Time other) const {
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return us_ <= other.us_;
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}
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bool operator>(Time other) const {
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return us_ > other.us_;
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}
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bool operator>=(Time other) const {
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return us_ >= other.us_;
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}
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private:
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friend class TimeDelta;
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// Explodes the given time to either local time |is_local = true| or UTC
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// |is_local = false|.
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void Explode(bool is_local, Exploded* exploded) const;
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// Unexplodes a given time assuming the source is either local time
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// |is_local = true| or UTC |is_local = false|.
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static Time FromExploded(bool is_local, const Exploded& exploded);
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explicit Time(int64_t us) : us_(us) {
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}
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// The representation of Jan 1, 1970 UTC in microseconds since the
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// platform-dependent epoch.
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static const int64_t kTimeTToMicrosecondsOffset;
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// Time in microseconds in UTC.
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int64_t us_;
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};
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inline Time TimeDelta::operator+(Time t) const {
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return Time(t.us_ + delta_);
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}
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// Inline the TimeDelta factory methods, for fast TimeDelta construction.
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// static
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inline TimeDelta TimeDelta::FromDays(int64_t days) {
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return TimeDelta(days * Time::kMicrosecondsPerDay);
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}
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// static
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inline TimeDelta TimeDelta::FromHours(int64_t hours) {
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return TimeDelta(hours * Time::kMicrosecondsPerHour);
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}
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// static
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inline TimeDelta TimeDelta::FromMinutes(int64_t minutes) {
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return TimeDelta(minutes * Time::kMicrosecondsPerMinute);
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}
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// static
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inline TimeDelta TimeDelta::FromSeconds(int64_t secs) {
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return TimeDelta(secs * Time::kMicrosecondsPerSecond);
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}
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// static
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inline TimeDelta TimeDelta::FromMilliseconds(int64_t ms) {
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return TimeDelta(ms * Time::kMicrosecondsPerMillisecond);
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}
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// static
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inline TimeDelta TimeDelta::FromMicroseconds(int64_t us) {
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return TimeDelta(us);
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}
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// TimeTicks ------------------------------------------------------------------
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class TimeTicks {
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public:
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TimeTicks() : ticks_(0) {
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}
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// Platform-dependent tick count representing "right now."
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// The resolution of this clock is ~1-15ms. Resolution varies depending
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// on hardware/operating system configuration.
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static TimeTicks Now();
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// Returns a platform-dependent high-resolution tick count. Implementation
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// is hardware dependent and may or may not return sub-millisecond
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// resolution. THIS CALL IS GENERALLY MUCH MORE EXPENSIVE THAN Now() AND
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// SHOULD ONLY BE USED WHEN IT IS REALLY NEEDED.
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static TimeTicks HighResNow();
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// Returns true if this object has not been initialized.
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bool is_null() const {
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return ticks_ == 0;
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}
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// Returns the internal numeric value of the TimeTicks object.
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int64_t ToInternalValue() const {
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return ticks_;
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}
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TimeTicks& operator=(TimeTicks other) {
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ticks_ = other.ticks_;
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return *this;
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}
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// Compute the difference between two times.
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TimeDelta operator-(TimeTicks other) const {
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return TimeDelta(ticks_ - other.ticks_);
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}
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// Modify by some time delta.
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TimeTicks& operator+=(TimeDelta delta) {
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ticks_ += delta.delta_;
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return *this;
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}
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TimeTicks& operator-=(TimeDelta delta) {
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ticks_ -= delta.delta_;
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return *this;
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}
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// Return a new TimeTicks modified by some delta.
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TimeTicks operator+(TimeDelta delta) const {
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return TimeTicks(ticks_ + delta.delta_);
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}
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TimeTicks operator-(TimeDelta delta) const {
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return TimeTicks(ticks_ - delta.delta_);
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}
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// Comparison operators
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bool operator==(TimeTicks other) const {
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return ticks_ == other.ticks_;
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}
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bool operator!=(TimeTicks other) const {
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return ticks_ != other.ticks_;
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}
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bool operator<(TimeTicks other) const {
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return ticks_ < other.ticks_;
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}
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bool operator<=(TimeTicks other) const {
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return ticks_ <= other.ticks_;
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}
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bool operator>(TimeTicks other) const {
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return ticks_ > other.ticks_;
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}
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bool operator>=(TimeTicks other) const {
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return ticks_ >= other.ticks_;
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}
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protected:
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friend class TimeDelta;
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friend class PageLoadTrackerUnitTest;
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// Please use Now() to create a new object. This is for internal use
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// and testing. Ticks is in microseconds.
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explicit TimeTicks(int64_t ticks) : ticks_(ticks) {
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}
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// Tick count in microseconds.
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int64_t ticks_;
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#if defined(OS_WIN)
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typedef DWORD (*TickFunctionType)(void);
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static TickFunctionType SetMockTickFunction(TickFunctionType ticker);
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#endif
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};
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inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
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return TimeTicks(t.ticks_ + delta_);
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}
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} // namespace base
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#endif // BASE_TIME_H_
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