小白C++入坑學(xué)廢之旅（八）-創(chuàng)新互聯(lián)

在開始入坑C++的時間魔法學(xué)習(xí)的開始，我曾發(fā)下宏愿，希望能夠通過所學(xué)構(gòu)建一個自己的好用的C++的時間幫助類。它需要具有下面一些特性：

讓客戶滿意是我們工作的目標(biāo)，不斷超越客戶的期望值來自于我們對這個行業(yè)的熱愛。我們立志把好的技術(shù)通過有效、簡單的方式提供給客戶，將通過不懈努力成為客戶在信息化領(lǐng)域值得信任、有價值的長期合作伙伴，公司提供的服務(wù)項目有：域名與空間、虛擬主機(jī)、營銷軟件、網(wǎng)站建設(shè)、社旗網(wǎng)站維護(hù)、網(wǎng)站推廣。

可以獲取當(dāng)前本地的最新時間。
可以通過millisecond構(gòu)建時間。
可以獲取時間中的year， month以及day部分?jǐn)?shù)值，甚至hour， minute和second等。
可以format輸出特定的時間戳字符串。
可以parse特定的時間戳字符串并構(gòu)建時間。
可以對year，month， day，hour，minute，second各刻度上進(jìn)行加減算術(shù)運算。
可以判斷兩個時間的早晚。

進(jìn)過一段時間的努力，C++的時間魔法的學(xué)習(xí)要漸漸迎來它的落幕。今天在這里我需要兌現(xiàn)上面相當(dāng)大一部分諾言。大地上慢慢響起時間魔法咒語的迎唱聲，我看向深邃的星空，繁星開始律動，灑下無數(shù)的星輝，時間的五彩光輝在時空盡頭盤旋，橫梗古今 —— 那就是我的魔法??！

class LocalDateTime
    {

    private:
        TimeScale *year;

        TimeScale *month;

        TimeScale *day;

        TimeScale *hour;

        TimeScale *minute;

        TimeScale *second;

        TimeScale *milliSecond;

    public:
        LocalDateTime();

        LocalDateTime(long milliSecond);

        LocalDateTime(int year, int month, int day);

        LocalDateTime(int year, int month, int day, int hour, int minute, int second);

        LocalDateTime(int year, int month, int day, int hour, int minute, int second, int milliSecond);

        LocalDateTime(LocalDateTime &source);

        TimeScale *getYear();

        TimeScale *getMonth();

        TimeScale *getDay();

        TimeScale *getHour();

        TimeScale *getMinute();

        TimeScale *getSecond();

        TimeScale *getMilliSecond();

        bool operator<(LocalDateTime &other);

        bool operator>(LocalDateTime &other);

        bool operator<=(LocalDateTime &other);

        bool operator>=(LocalDateTime &other);

        bool operator==(LocalDateTime &other);

        bool operator!=(LocalDateTime &other);

        ~LocalDateTime();
    };

在時間魔法中，LocalDateTime是由Year，Month，Day等咒語組成的。通過LocalDateTime的每個時間刻度部分，我們可以對整個LocalDateTime的時間進(jìn)行增減運算。同時，為了支持LocalDateTime的時間判斷能力，我也對TimeScale的能力進(jìn)行的擴(kuò)充，增加了邏輯判斷運算符的重載：

bool operator<(const TimeScale &other);

bool operator>(const TimeScale &other);

bool operator<=(const TimeScale &other);

bool operator>=(const TimeScale &other);

bool operator==(const TimeScale &other);

bool operator!=(const TimeScale &other);

這樣我們可以借助對時間刻度的邏輯判斷實現(xiàn)時間魔法的邏輯判斷，以大小判斷為例：

bool datetime::LocalDateTime::operator<(datetime::LocalDateTime &other)
{
    bool result = (*year)< (*(other.year));
    if (!result)
    {
        result = (*month)< (*(other.month));

        if (!result)
        {
            result = (*day)< (*(other.day));

            if (!result)
            {
                result = (*hour)< (*(other.hour));

                if (!result)
                {
                    result = (*minute)< (*(other.minute));

                    if (!result)
                    {
                        result = (*second)< (*(other.second));

                        if (!result)
                        {
                            result = (*milliSecond)< (*(other.milliSecond));
                        }
                    }
                }
            }
        }
    }

    return result;
}

同時提供了多個重載的構(gòu)造方法，實現(xiàn)了獲取本地時間，通過日期或者通過具體時間構(gòu)建時間的方法：

LocalDateTime();

LocalDateTime(long milliSecond);

LocalDateTime(int year, int month, int day);

LocalDateTime(int year, int month, int day, int hour, int minute, int second);

LocalDateTime(int year, int month, int day, int hour, int minute, int second, int milliSecond);

LocalDateTime(LocalDateTime &source);

其中還是以默認(rèn)構(gòu)造函數(shù)為例：

datetime::LocalDateTime::LocalDateTime()
{
    long _milliseconds = std::chrono::duration_cast(std::chrono::system_clock::now().time_since_epoch()).count();
    _milliseconds += datetime::timezoneOffset() * 3600000;
    int _year;
    int _month;
    int _day;
    int _hour;
    int _minute;
    int _second;
    int _millisecond;

    datetime::getGregorianDateTime(_milliseconds, _year, _month, _day, _hour, _minute, _second, _millisecond);
    new (this) LocalDateTime(_year, _month, _day, _hour, _minute, _second, _millisecond);
}

此外了為了方便調(diào)試，我還提供了全局的輸出操作重載，打印輸出時間值。當(dāng)然這里有一點比較重要就是，不要把輸出重載操作定義在命名空間內(nèi)，不然你有可能找不到定義。

std::ostream &operator<<(std::ostream &out, datetime::LocalDateTime &localDateTime);

所以是時候，亮出我們真正的時間魔法了：

datetime::LocalDateTime::LocalDateTime()
{
    long _milliseconds = std::chrono::duration_cast(std::chrono::system_clock::now().time_since_epoch()).count();
    _milliseconds += datetime::timezoneOffset() * 3600000;
    int _year;
    int _month;
    int _day;
    int _hour;
    int _minute;
    int _second;
    int _millisecond;

    datetime::getGregorianDateTime(_milliseconds, _year, _month, _day, _hour, _minute, _second, _millisecond);
    new (this) LocalDateTime(_year, _month, _day, _hour, _minute, _second, _millisecond);
}

datetime::LocalDateTime::LocalDateTime(long milliSecond)
{
    int _year;
    int _month;
    int _day;
    int _hour;
    int _minute;
    int _second;
    int _millisecond;

    datetime::getGregorianDateTime(milliSecond, _year, _month, _day, _hour, _minute, _second, _millisecond);
    new (this) LocalDateTime(_year, _month, _day, _hour, _minute, _second, _millisecond);
}

datetime::LocalDateTime::LocalDateTime(int year, int month, int day) : LocalDateTime(year, month, day, 0, 0, 0, 0) {}

datetime::LocalDateTime::LocalDateTime(int year, int month, int day, int hour, int minute, int second) : LocalDateTime(year, month, day, hour, minute, second, 0) {}

datetime::LocalDateTime::LocalDateTime(int year, int month, int day, int hour, int minute, int second, int milliSecond)
{
    int daysInMonths[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    if (datetime::isLeapYear(year))
    {
        daysInMonths[1] = 29;
    }

    this->year = new datetime::Year{year};
    this->month = new datetime::Month{this->year, month};
    this->year->setChild(this->month);
    this->day = new datetime::Day{this->month, day, daysInMonths[month - 1]};
    this->month->setChild(this->day);
    this->hour = new datetime::TimeScale{this->day, hour, 24};
    this->day->setChild(this->hour);
    this->minute = new datetime::TimeScale{this->hour, minute, 60};
    this->hour->setChild(this->minute);
    this->second = new datetime::TimeScale{this->minute, second, 60};
    this->minute->setChild(this->second);
    this->milliSecond = new datetime::TimeScale{this->second, milliSecond, 1000};
    this->second->setChild(this->milliSecond);
}

datetime::LocalDateTime::LocalDateTime(LocalDateTime &source)
{
    int _year = *(source.year);
    int _month = *(source.month);
    int _day = *(source.day);
    int _hour = *(source.hour);
    int _minute = *(source.minute);
    int _second = *(source.second);
    int _millisecond = *(source.milliSecond);

    new (this) LocalDateTime(_year, _month, _day, _hour, _minute, _second, _millisecond);
}

datetime::TimeScale *datetime::LocalDateTime::getYear()
{
    return year;
}

datetime::TimeScale *datetime::LocalDateTime::getMonth()
{
    return month;
}

datetime::TimeScale *datetime::LocalDateTime::getDay()
{
    return day;
}

datetime::TimeScale *datetime::LocalDateTime::getHour()
{
    return hour;
}

datetime::TimeScale *datetime::LocalDateTime::getMinute()
{
    return minute;
}

datetime::TimeScale *datetime::LocalDateTime::getSecond()
{
    return second;
}

datetime::TimeScale *datetime::LocalDateTime::getMilliSecond()
{
    return milliSecond;
}

bool datetime::LocalDateTime::operator<(datetime::LocalDateTime &other)
{
    bool result = (*year)< (*(other.year));
    if (!result)
    {
        result = (*month)< (*(other.month));

        if (!result)
        {
            result = (*day)< (*(other.day));

            if (!result)
            {
                result = (*hour)< (*(other.hour));

                if (!result)
                {
                    result = (*minute)< (*(other.minute));

                    if (!result)
                    {
                        result = (*second)< (*(other.second));

                        if (!result)
                        {
                            result = (*milliSecond)< (*(other.milliSecond));
                        }
                    }
                }
            }
        }
    }

    return result;
}

bool datetime::LocalDateTime::operator>(datetime::LocalDateTime &other)
{
    bool result = (*year) >(*(other.year));
    if (!result)
    {
        result = (*month) >(*(other.month));

        if (!result)
        {
            result = (*day) >(*(other.day));

            if (!result)
            {
                result = (*hour) >(*(other.hour));

                if (!result)
                {
                    result = (*minute) >(*(other.minute));

                    if (!result)
                    {
                        result = (*second) >(*(other.second));

                        if (!result)
                        {
                            result = (*milliSecond) >(*(other.milliSecond));
                        }
                    }
                }
            }
        }
    }

    return result;
}

bool datetime::LocalDateTime::operator==(datetime::LocalDateTime &other)
{
    return (*year) == (*(other.year)) && (*month) == (*(other.month)) && (*day) == (*(other.day)) && (*hour) == (*(other.hour)) && (*minute) == (*(other.minute)) && (*second) == (*(other.second)) && (*milliSecond) == (*(other.milliSecond));
}

bool datetime::LocalDateTime::operator<=(datetime::LocalDateTime &other)
{
    return !this->operator>(other);
}

bool datetime::LocalDateTime::operator>=(datetime::LocalDateTime &other)
{
    return !this->operator<(other);
}

bool datetime::LocalDateTime::operator!=(datetime::LocalDateTime &other)
{
    return !this->operator==(other);
}

datetime::LocalDateTime::~LocalDateTime()
{
    delete year;
    delete month;
    delete day;
    delete hour;
    delete minute;
    delete second;
    delete milliSecond;
}

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本文名稱：小白C++入坑學(xué)廢之旅（八）-創(chuàng)新互聯(lián)
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