CPPUtil/UtilNanoTime.hpp

   1 //
   2 //  UtilNanoTime.hpp
   3 //  CPPUtil
   4 //
   5 //  Created by James McIlree on 4/14/13.
   6 //  Copyright (c) 2013 Apple. All rights reserved.
   7 //
   8
   9 #ifndef __CPPUtil__UtilNanoTime__
  10 #define __CPPUtil__UtilNanoTime__
  11
  12 class NanoTime {
  13     protected:
  14         uint64_t        _time;
  15
  16     public:
  17         NanoTime() : _time(0ULL) {}
  18         NanoTime(uint64_t t) : _time(t) {}
  19
  20         bool operator==(const NanoTime& rhs) const              { return this->_time == rhs._time; }
  21         bool operator!=(const NanoTime &rhs) const              { return !(*this == rhs); }
  22
  23         bool operator<(const NanoTime& rhs) const               { return this->_time < rhs._time; }
  24         bool operator<=(const NanoTime& rhs) const              { return this->_time <= rhs._time; }
  25         bool operator>(const NanoTime& rhs) const               { return this->_time > rhs._time; }
  26         bool operator>=(const NanoTime& rhs) const              { return this->_time >= rhs._time; }
  27
  28         // We do not want to be able to mutate NanoTime(s)
  29         // without type enforcement, but it is useful to be able
  30         // to say "if (time == 0) {}", so we have value based
  31         // operators for comparison
  32         bool operator==(uint64_t value) const                   { return this->_time == value; }
  33         bool operator!=(uint64_t value) const                   { return !(*this == value); }
  34
  35         bool operator<(uint64_t value) const                    { return this->_time < value; }
  36         bool operator<=(uint64_t value) const                   { return this->_time <= value; }
  37         bool operator>(uint64_t value) const                    { return this->_time > value; }
  38         bool operator>=(uint64_t value) const                   { return this->_time >= value; }
  39
  40         NanoTime operator+(const NanoTime& rhs) const           { return NanoTime(_time + rhs._time); }
  41         NanoTime operator-(const NanoTime& rhs) const           { return NanoTime(_time - rhs._time); }
  42         NanoTime operator*(const NanoTime& rhs) const           { return NanoTime(_time * rhs._time); }
  43         NanoTime operator/(const NanoTime& rhs) const           { return NanoTime(_time / rhs._time); }
  44
  45         NanoTime& operator+=(const NanoTime& rhs)               { _time += rhs._time; return *this; }
  46
  47         AbsTime abs_time() const; // NOTE! Uses system mach_timebase_info, potentially expensive conversion costs.
  48         AbsTime abs_time(mach_timebase_info_data_t timebase_info) const {
  49                 return AbsTime(_time * timebase_info.denom / timebase_info.numer);
  50         }
  51
  52         uint64_t value() const                                  { return _time; }
  53         double double_value() const                             { return (double)_time; }
  54 };
  55
  56
  57 #endif /* defined(__CPPUtil__UtilNanoTime__) */