1 files changed, 265 insertions, 0 deletions
diff --git a/Source/WTF/wtf/Seconds.h b/Source/WTF/wtf/Seconds.h
new file mode 100644
index 000000000..5b8a7a369
--- /dev/null
+++ b/Source/WTF/wtf/Seconds.h
@@ -0,0 +1,265 @@
+/*
+ * Copyright (C) 2016 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. 
+ */
+
+#ifndef WTF_Seconds_h
+#define WTF_Seconds_h
+
+#include <wtf/MathExtras.h>
+
+namespace WTF {
+
+class MonotonicTime;
+class PrintStream;
+class TimeWithDynamicClockType;
+class WallTime;
+
+class Seconds {
+public:
+    Seconds() { }
+    
+    explicit constexpr Seconds(double value)
+        : m_value(value)
+    {
+    }
+    
+    double value() const { return m_value; }
+    
+    double minutes() const { return m_value / 60; }
+    double seconds() const { return m_value; }
+    double milliseconds() const { return seconds() * 1000; }
+    double microseconds() const { return milliseconds() * 1000; }
+    double nanoseconds() const { return microseconds() * 1000; }
+    
+    static constexpr Seconds fromMinutes(double minutes)
+    {
+        return Seconds(minutes * 60);
+    }
+
+    static constexpr Seconds fromMilliseconds(double milliseconds)
+    {
+        return Seconds(milliseconds / 1000);
+    }
+    
+    static constexpr Seconds fromMicroseconds(double microseconds)
+    {
+        return fromMilliseconds(microseconds / 1000);
+    }
+    
+    static constexpr Seconds fromNanoseconds(double nanoseconds)
+    {
+        return fromMicroseconds(nanoseconds / 1000);
+    }
+    
+    static constexpr Seconds infinity()
+    {
+        return Seconds(std::numeric_limits<double>::infinity());
+    }
+    
+    explicit operator bool() const { return !!m_value; }
+    
+    Seconds operator+(Seconds other) const
+    {
+        return Seconds(value() + other.value());
+    }
+    
+    Seconds operator-(Seconds other) const
+    {
+        return Seconds(value() - other.value());
+    }
+    
+    Seconds operator-() const
+    {
+        return Seconds(-value());
+    }
+    
+    // It makes sense to consider scaling a duration, like, "I want to wait 5 times as long as
+    // last time!".
+    Seconds operator*(double scalar) const
+    {
+        return Seconds(value() * scalar);
+    }
+    
+    Seconds operator/(double scalar) const
+    {
+        return Seconds(value() / scalar);
+    }
+    
+    // It's reasonable to think about ratios between Seconds.
+    double operator/(Seconds other) const
+    {
+        return value() / other.value();
+    }
+    
+    Seconds operator%(double scalar) const
+    {
+        return Seconds(fmod(value(), scalar));
+    }
+    
+    // This solves for r, where:
+    //
+    //     floor(this / other) + r / other = this / other
+    //
+    // Therefore, if this is Seconds then r is Seconds.
+    Seconds operator%(Seconds other) const
+    {
+        return Seconds(fmod(value(), other.value()));
+    }
+    
+    Seconds& operator+=(Seconds other)
+    {
+        return *this = *this + other;
+    }
+    
+    Seconds& operator-=(Seconds other)
+    {
+        return *this = *this - other;
+    }
+    
+    Seconds& operator*=(double scalar)
+    {
+        return *this = *this * scalar;
+    }
+    
+    Seconds& operator/=(double scalar)
+    {
+        return *this = *this / scalar;
+    }
+    
+    Seconds& operator%=(double scalar)
+    {
+        return *this = *this % scalar;
+    }
+    
+    Seconds& operator%=(Seconds other)
+    {
+        return *this = *this % other;
+    }
+    
+    WTF_EXPORT_PRIVATE WallTime operator+(WallTime) const;
+    WTF_EXPORT_PRIVATE MonotonicTime operator+(MonotonicTime) const;
+    WTF_EXPORT_PRIVATE TimeWithDynamicClockType operator+(const TimeWithDynamicClockType&) const;
+    
+    WTF_EXPORT_PRIVATE WallTime operator-(WallTime) const;
+    WTF_EXPORT_PRIVATE MonotonicTime operator-(MonotonicTime) const;
+    WTF_EXPORT_PRIVATE TimeWithDynamicClockType operator-(const TimeWithDynamicClockType&) const;
+    
+    bool operator==(Seconds other) const
+    {
+        return m_value == other.m_value;
+    }
+    
+    bool operator!=(Seconds other) const
+    {
+        return m_value != other.m_value;
+    }
+    
+    bool operator<(Seconds other) const
+    {
+        return m_value < other.m_value;
+    }
+    
+    bool operator>(Seconds other) const
+    {
+        return m_value > other.m_value;
+    }
+    
+    bool operator<=(Seconds other) const
+    {
+        return m_value <= other.m_value;
+    }
+    
+    bool operator>=(Seconds other) const
+    {
+        return m_value >= other.m_value;
+    }
+    
+    WTF_EXPORT_PRIVATE void dump(PrintStream&) const;
+    
+private:
+    double m_value { 0 };
+};
+
+inline namespace seconds_literals {
+
+constexpr Seconds operator"" _min(long double minutes)
+{
+    return Seconds::fromMinutes(minutes);
+}
+
+constexpr Seconds operator"" _s(long double seconds)
+{
+    return Seconds(seconds);
+}
+
+constexpr Seconds operator"" _ms(long double milliseconds)
+{
+    return Seconds::fromMilliseconds(milliseconds);
+}
+
+constexpr Seconds operator"" _us(long double microseconds)
+{
+    return Seconds::fromMicroseconds(microseconds);
+}
+
+constexpr Seconds operator"" _ns(long double nanoseconds)
+{
+    return Seconds::fromNanoseconds(nanoseconds);
+}
+
+constexpr Seconds operator"" _min(unsigned long long minutes)
+{
+    return Seconds::fromMinutes(minutes);
+}
+
+constexpr Seconds operator"" _s(unsigned long long seconds)
+{
+    return Seconds(seconds);
+}
+
+constexpr Seconds operator"" _ms(unsigned long long milliseconds)
+{
+    return Seconds::fromMilliseconds(milliseconds);
+}
+
+constexpr Seconds operator"" _us(unsigned long long microseconds)
+{
+    return Seconds::fromMicroseconds(microseconds);
+}
+
+constexpr Seconds operator"" _ns(unsigned long long nanoseconds)
+{
+    return Seconds::fromNanoseconds(nanoseconds);
+}
+
+} // inline seconds_literals
+
+WTF_EXPORT_PRIVATE void sleep(Seconds);
+
+} // namespace WTF
+
+using namespace WTF::seconds_literals;
+using WTF::Seconds;
+
+#endif // WTF_Seconds_h