src/foundation/ZTime.h

/*  @(#) $Id: ZTime.h,v 1.10 2006/07/23 22:00:42 agreen Exp $ */

/* ------------------------------------------------------------
Copyright (c) 2003 Andrew Green and Learning in Motion, Inc.
http://www.zoolib.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
------------------------------------------------------------ */

#ifndef __ZTime__
#define __ZTime__ 1
#include "zconfig.h"

#include "ZDebug.h"
#include "ZTypes.h"

#include "ZCompat_operator_bool.h"

class ZMutex;

// =================================================================================================
#pragma mark -
#pragma mark * ZTime

class ZTime
        {
    ZOOLIB_DEFINE_OPERATOR_BOOL_TYPES(ZTime, operator_bool_generator_type, operator_bool_type);
public:
        ZTime();

        ZTime(double iDouble) : fVal(iDouble) {}

        ZTime& operator=(double iDouble) { fVal = iDouble; return *this; }

        operator operator_bool_type() const;

        bool operator<(const ZTime& iOther) const;

        bool operator<=(const ZTime& iOther) const { return !(iOther < *this); }

        bool operator>(const ZTime& iOther) const { return iOther < *this; }

        bool operator>=(const ZTime& iOther) const { return !(*this < iOther); }

        bool operator==(const ZTime& iOther) const;

        bool operator!=(const ZTime& iOther) const { return !(*this == iOther); }

        int Compare(const ZTime& iOther) const;

        double operator-(const ZTime& iOther) const { return fVal - iOther.fVal; }

        ZTime operator-(double iInterval)
                {
                ZTime result = *this;
                result.fVal -= iInterval;
                return result;
                }

        ZTime& operator-=(double iInterval)
                { fVal -= iInterval; return *this; }

        ZTime operator+(double iInterval) const
                {
                ZTime result = *this;
                result.fVal += iInterval;
                return result;
                }

        ZTime& operator+=(double iInterval)
                { fVal += iInterval; return *this; }

        static ZTime sNow();
        static ZTime sSystem();

        double fVal;

        static ZMutex sMutex;

        static const uint32 kEpochDelta_1900_To_1904
                = 4U * 365 * 24 * 60 * 60; // 126,144,000

        static const uint32 kEpochDelta_1904_To_1970
                = ((66U * 365) + 17) * 24 * 60 * 60; // 2,082,844,800

        static const uint32 kEpochDelta_1900_To_1970
                = ((70U * 365) + 17) * 24 * 60 * 60; // 2,208,988,800

        static const uint64 kEpochDelta_1601_To_1970
                = ((369LLU * 365) + 89) * 24 * 60 * 60; // == 11,644,473,600
        };

namespace ZooLib {
template <class T> int sCompare_T(const T& iL, const T& iR);
template <> inline int sCompare_T(const ZTime& iL, const ZTime& iR)
        { return iL.Compare(iR); }
}

#endif // __ZTime__

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