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/*
* Copyright (C) 2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/Seconds.h>
namespace WTF {
template<typename DerivedTime>
class GenericTimeMixin {
WTF_MAKE_FAST_ALLOCATED;
public:
// Call this if you know for sure that the double represents the time according to the
// same time source as DerivedTime. It must be in seconds.
static constexpr DerivedTime fromRawSeconds(double value)
{
return DerivedTime(value);
}
static constexpr DerivedTime infinity() { return fromRawSeconds(std::numeric_limits<double>::infinity()); }
static constexpr DerivedTime nan() { return fromRawSeconds(std::numeric_limits<double>::quiet_NaN()); }
bool isNaN() const { return std::isnan(m_value); }
bool isInfinity() const { return std::isinf(m_value); }
bool isFinite() const { return std::isfinite(m_value); }
constexpr Seconds secondsSinceEpoch() const { return Seconds(m_value); }
explicit constexpr operator bool() const { return !!m_value; }
constexpr DerivedTime operator+(Seconds other) const
{
return fromRawSeconds(m_value + other.value());
}
constexpr DerivedTime operator-(Seconds other) const
{
return fromRawSeconds(m_value - other.value());
}
Seconds operator%(Seconds other) const
{
return Seconds { fmod(m_value, other.value()) };
}
// Time is a scalar and scalars can be negated as this could arise from algebraic
// transformations. So, we allow it.
constexpr DerivedTime operator-() const
{
return fromRawSeconds(-m_value);
}
DerivedTime operator+=(Seconds other)
{
return *static_cast<DerivedTime*>(this) = *static_cast<DerivedTime*>(this) + other;
}
DerivedTime operator-=(Seconds other)
{
return *static_cast<DerivedTime*>(this) = *static_cast<DerivedTime*>(this) - other;
}
constexpr Seconds operator-(DerivedTime other) const
{
return Seconds(m_value - other.m_value);
}
friend constexpr bool operator==(GenericTimeMixin, GenericTimeMixin) = default;
constexpr bool operator<(const GenericTimeMixin& other) const
{
return m_value < other.m_value;
}
constexpr bool operator>(const GenericTimeMixin& other) const
{
return m_value > other.m_value;
}
constexpr bool operator<=(const GenericTimeMixin& other) const
{
return m_value <= other.m_value;
}
constexpr bool operator>=(const GenericTimeMixin& other) const
{
return m_value >= other.m_value;
}
DerivedTime isolatedCopy() const
{
return *static_cast<const DerivedTime*>(this);
}
static constexpr DerivedTime timePointFromNow(Seconds relativeTimeFromNow)
{
if (relativeTimeFromNow.isInfinity())
return DerivedTime::fromRawSeconds(relativeTimeFromNow.value());
return DerivedTime::now() + relativeTimeFromNow;
}
protected:
// This is the epoch. So, x.secondsSinceEpoch() should be the same as x - DerivedTime().
constexpr GenericTimeMixin() = default;
constexpr GenericTimeMixin(double rawValue)
: m_value(rawValue)
{
}
double m_value { 0 };
};
} // namespace WTF
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