system_cmds-643.30.1.tar.gz

[apple/system_cmds.git] / CPPUtil / UtilAbsTime.hpp

diff --git a/CPPUtil/UtilAbsTime.hpp b/CPPUtil/UtilAbsTime.hpp
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+//
+//  UtilAbsTime.hpp
+//  CPPUtil
+//
+//  Created by James McIlree on 4/14/13.
+//  Copyright (c) 2013 Apple. All rights reserved.
+//
+
+#ifndef __CPPUtil__UtilAbsTime__
+#define __CPPUtil__UtilAbsTime__
+
+class NanoTime;
+
+class AbsTime {
+    protected:
+       uint64_t _time;
+
+    public:
+       // Minimum and Maximum possible values
+       static const AbsTime BEGINNING_OF_TIME;
+       static const AbsTime END_OF_TIME;
+
+       static AbsTime now();
+
+       AbsTime() : _time(0ULL) {}
+       explicit AbsTime(uint64_t t) : _time(t) {}
+
+       bool operator==(const AbsTime& rhs) const               { return this->_time == rhs._time; }
+       bool operator!=(const AbsTime &rhs) const               { return !(*this == rhs); }
+
+       bool operator<(const AbsTime& rhs) const                { return this->_time < rhs._time; }
+       bool operator<=(const AbsTime& rhs) const               { return this->_time <= rhs._time; }
+       bool operator>(const AbsTime& rhs) const                { return this->_time > rhs._time; }
+       bool operator>=(const AbsTime& rhs) const               { return this->_time >= rhs._time; }
+
+       // We do not want to be able to mutate AbsTime(s)
+       // without type enforcement, but it is useful to be able
+       // to say "if (time == 0) {}", so we have value based
+       // operators for comparison
+       bool operator==(uint64_t value) const                   { return this->_time == value; }
+       bool operator!=(uint64_t value) const                   { return !(*this == value); }
+
+       bool operator<(uint64_t value) const                    { return this->_time < value; }
+       bool operator<=(uint64_t value) const                   { return this->_time <= value; }
+       bool operator>(uint64_t value) const                    { return this->_time > value; }
+       bool operator>=(uint64_t value) const                   { return this->_time >= value; }
+
+       AbsTime operator+(const AbsTime& rhs) const             { return AbsTime(_time + rhs._time); }
+       AbsTime operator-(const AbsTime& rhs) const             { return AbsTime(_time - rhs._time); }
+       AbsTime operator*(const AbsTime& rhs) const             { return AbsTime(_time * rhs._time); }
+       AbsTime operator/(const AbsTime& rhs) const             { return AbsTime(_time / rhs._time); }
+
+       AbsTime& operator+=(const AbsTime& rhs)                 { _time += rhs._time; return *this; }
+
+       NanoTime nano_time() const; // NOTE! Uses system mach_timebase_info, potentially expensive conversion costs.
+       NanoTime nano_time(mach_timebase_info_data_t timebase_info) const;
+
+       uint64_t value() const                                  { return _time; }
+       double double_value() const                             { return (double)_time; }
+};
+
+#endif /* defined(__CPPUtil__UtilAbsTime__) */