rippled/beast/chrono/RelativeTime.h

//------------------------------------------------------------------------------
/*
    This file is part of Beast: https://github.com/vinniefalco/Beast
    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>

    Portions of this file are from JUCE.
    Copyright (c) 2013 - Raw Material Software Ltd.
    Please visit http://www.juce.com

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#ifndef BEAST_CHRONO_RELATIVETIME_H_INCLUDED
#define BEAST_CHRONO_RELATIVETIME_H_INCLUDED

#include "../Config.h"
#include "../strings/String.h"

#include <string>
#include <sstream>

namespace beast {

//==============================================================================
/** A relative measure of time.

    The time is stored as a number of seconds, at double-precision floating
    point accuracy, and may be positive or negative.

    If you need an absolute time, (i.e. a date + time), see the Time class.
*/
class BEAST_API  RelativeTime
{
public:
    //==============================================================================
    /** Creates a RelativeTime.

        @param seconds  the number of seconds, which may be +ve or -ve.
        @see milliseconds, minutes, hours, days, weeks
    */
    explicit RelativeTime (double seconds = 0.0) noexcept;

    /** Copies another relative time. */
    RelativeTime (const RelativeTime& other) noexcept;

    /** Copies another relative time. */
    RelativeTime& operator= (const RelativeTime& other) noexcept;

    /** Destructor. */
    ~RelativeTime() noexcept;

    //==============================================================================
    /** Creates a new RelativeTime object representing a number of milliseconds.
        @see seconds, minutes, hours, days, weeks
    */
    static RelativeTime milliseconds (int milliseconds) noexcept;

    /** Creates a new RelativeTime object representing a number of milliseconds.
        @see seconds, minutes, hours, days, weeks
    */
    static RelativeTime milliseconds (int64 milliseconds) noexcept;

    /** Creates a new RelativeTime object representing a number of seconds.
        @see milliseconds, minutes, hours, days, weeks
    */
    static RelativeTime seconds (double seconds) noexcept;

    /** Creates a new RelativeTime object representing a number of minutes.
        @see milliseconds, hours, days, weeks
    */
    static RelativeTime minutes (double numberOfMinutes) noexcept;

    /** Creates a new RelativeTime object representing a number of hours.
        @see milliseconds, minutes, days, weeks
    */
    static RelativeTime hours (double numberOfHours) noexcept;

    /** Creates a new RelativeTime object representing a number of days.
        @see milliseconds, minutes, hours, weeks
    */
    static RelativeTime days (double numberOfDays) noexcept;

    /** Creates a new RelativeTime object representing a number of weeks.
        @see milliseconds, minutes, hours, days
    */
    static RelativeTime weeks (double numberOfWeeks) noexcept;

    //==============================================================================
    /** Returns the number of milliseconds this time represents.
        @see milliseconds, inSeconds, inMinutes, inHours, inDays, inWeeks
    */
    int64 inMilliseconds() const noexcept;

    /** Returns the number of seconds this time represents.
        @see inMilliseconds, inMinutes, inHours, inDays, inWeeks
    */
    double inSeconds() const noexcept       { return numSeconds; }

    /** Returns the number of minutes this time represents.
        @see inMilliseconds, inSeconds, inHours, inDays, inWeeks
    */
    double inMinutes() const noexcept;

    /** Returns the number of hours this time represents.
        @see inMilliseconds, inSeconds, inMinutes, inDays, inWeeks
    */
    double inHours() const noexcept;

    /** Returns the number of days this time represents.
        @see inMilliseconds, inSeconds, inMinutes, inHours, inWeeks
    */
    double inDays() const noexcept;

    /** Returns the number of weeks this time represents.
        @see inMilliseconds, inSeconds, inMinutes, inHours, inDays
    */
    double inWeeks() const noexcept;

    /** Returns a readable textual description of the time.

        The exact format of the string returned will depend on
        the magnitude of the time - e.g.

        "1 min 4 secs", "1 hr 45 mins", "2 weeks 5 days", "140 ms"

        so that only the two most significant units are printed.

        The returnValueForZeroTime value is the result that is returned if the
        length is zero. Depending on your application you might want to use this
        to return something more relevant like "empty" or "0 secs", etc.

        @see inMilliseconds, inSeconds, inMinutes, inHours, inDays, inWeeks
    */
    String getDescription (const String& returnValueForZeroTime = "0") const;
    std::string to_string () const;

    //==============================================================================
    /** Adds another RelativeTime to this one. */
    RelativeTime operator+= (RelativeTime timeToAdd) noexcept;
    /** Subtracts another RelativeTime from this one. */
    RelativeTime operator-= (RelativeTime timeToSubtract) noexcept;

    /** Adds a number of seconds to this time. */
    RelativeTime operator+= (double secondsToAdd) noexcept;
    /** Subtracts a number of seconds from this time. */
    RelativeTime operator-= (double secondsToSubtract) noexcept;

private:
    //==============================================================================
    double numSeconds;
};

//==============================================================================
/** Compares two RelativeTimes. */
bool operator== (RelativeTime t1, RelativeTime t2) noexcept;
/** Compares two RelativeTimes. */
bool operator!= (RelativeTime t1, RelativeTime t2) noexcept;
/** Compares two RelativeTimes. */
bool operator>  (RelativeTime t1, RelativeTime t2) noexcept;
/** Compares two RelativeTimes. */
bool operator<  (RelativeTime t1, RelativeTime t2) noexcept;
/** Compares two RelativeTimes. */
bool operator>= (RelativeTime t1, RelativeTime t2) noexcept;
/** Compares two RelativeTimes. */
bool operator<= (RelativeTime t1, RelativeTime t2) noexcept;

//==============================================================================
/** Adds two RelativeTimes together. */
RelativeTime  operator+  (RelativeTime t1, RelativeTime t2) noexcept;
/** Subtracts two RelativeTimes. */
RelativeTime  operator-  (RelativeTime t1, RelativeTime t2) noexcept;

inline std::ostream& operator<< (std::ostream& os, RelativeTime const& diff)
{
    os << diff.to_string();
    return os;
}

}

#endif