Ichthyostega
4e9d54e6f9
Obviously the better choice and a perfect fit for our requirements; while the system-clock may jump and even move backwards on time service adjustments, the steady clock just counts the ticks since last boot. In libStdC++ both are implemented as int64_t and use nanoseconds resolution
83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
/*
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REAL-CLOCK.hpp - convenience front-end to access the system clock
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Copyright (C) Lumiera.org
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2012, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file real-clock.hpp
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** Front-end for simplified access to the current wall clock time.
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** The implementation relies on Lumiera vault functions to access the
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** system clock with a sufficient level of precision. The result is
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** delivered in lumiera's [internal time format](\ref lib::time::Time)
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**
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** @todo this might be a good candidate also to provide some kind of
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** translation service, i.e. a grid to anchor a logical time value
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** with actual running wall clock time.
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**
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** @see lib/time/timevalue.hpp
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*/
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#ifndef VAULT_REAL_CLOCK_H
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#define VAULT_REAL_CLOCK_H
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#include "lib/error.hpp"
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#include "lib/time/timevalue.hpp"
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namespace vault {
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using lib::time::Time;
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using lib::time::TimeValue;
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using lib::time::Offset;
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/**
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* Convenience frontend to access the current raw system time
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*/
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class RealClock
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{
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public:
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static Time
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now()
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{
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return Time{_readSystemTime()};
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}
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static bool
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wasRecently (Time event)
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{
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Offset past{event, now()};
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return Time::ZERO <= past
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and past < CONSIDERED_RECENT;
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}
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private:
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static TimeValue _readSystemTime();
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static const Offset CONSIDERED_RECENT;
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};
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} // namespace vault
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#endif
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