2024-07-12
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Blogger protocollum: LiUEEEEE
C++ columnae
C lingua columna
Data structura columnae
Genus algorithmus columnae
Columna in classica Niuke
Constructio, destructio, exemplum [Class and Objects (Part 2)].
Classis constructor memoratur. Classis data exemplo, methodus initialization talis est:
class Date
{
public:
Date(int year, int month, int day)
{
_year = year;
_month = month;
_day = day;
}
private:
int _year;
int _month;
int _day;
};
Ut in superiore codice ostenditur, sine ulteriori studio C++, utentes plerumque existimant codicem in conditore esse initializationem variabilium membri ordinis, sed plane contrarium est variabilis membrum. Adsignatio initialization in vero sensu dici non potest, quia initialization semel tantum initializari potest, cum fabricator valores plurium temporum variabilium membri assignare potest, exempli gratia:
Date(int year, int month, int day)
{
_year = year;
_year += 1;
}
Date(int year, int month, int day)
: _year(year)
, _month(month)
, _day(day)
{}
conscius esse mihi est:
class A
{
public:
A(int n)
:_a2(n)
,_a1(_a2)
{}
void Print()
{
cout << "_a1 = " << _a1 << endl;
cout << "_a2 = " << _a2 << endl;
}
private:
int _a1;
int _a2;
};
int main()
{
A aa(100);
aa.Print();
return 0;
}
Cum initialized ut in figura supra demonstratum est, eventus exspectationi repugnans fiet, ideo tales operationes vitandae sunt cum utendo.
class Date
{
public:
Date(int year)
: _year(year)
{}
Date& operator=(const Date& d)
{
if (this != &d)
{
_year = d._year;
_month = d._month;
_day = d._day;
}
return *this;
}
private:
int _year;
int _month;
int _day;
};
class Date
{
public:
Date(int year, int month = 1, int day = 1)
: _year(year)
, _month(month)
, _day(day)
{}
Date& operator=(const Date& d)
{
if (this != &d)
{
_year = d._year;
_month = d._month;
_day = d._day;
}
return *this;
}
private:
int _year;
int _month;
int _day;
};
Cum assignando valorem transeuntem, exempli gratia;
Date date(2024);
In gradu compilator, 2024 non directe attribuitur objecto classis creato, sed 2024 convertitur in obiectum temporale per conversionem implicitam, et tunc attribuitur obiecti classi quod per tale obiectum debet esse initialized classis initialized est A, et obiectum temporale genus est B;
Date A(2024);
等价于
Date A = B//B的值为2024
explicit Date(int year)
: _year(year)
{}
class Date
{
public:
Date(int year, int month = 1, int day = 1)
: _year(year)
, _month(month)
, _day(day)
{}
private:
int _year;
int _month;
int _day;
static int _i;
};
int Date::_i = 1;
Amici dividuntur in: amicus munera et amicus classes
class Date
{
friend void Print(Date& d);
public:
Date(int year = 1, int month = 1, int day = 1)
: _year(year)
, _month(month)
, _day(day)
{}
private:
int _year;
int _month;
int _day;
};
void Print(Date& d)
{
cout << d._year << " " << d._month << " " << d._day <<endl;
}
class Time
{
friend class Date; // 声明日期类为时间类的友元类，则在日期类中就直接访问Time类
//中的私有成员变量
public:
Time(int hour = 0, int minute = 0, int second = 0)
: _hour(hour)
, _minute(minute)
, _second(second)
{}
private:
int _hour;
int _minute;
int _second;
};
class Date
{
public:
Date(int year = 1900, int month = 1, int day = 1)
: _year(year)
, _month(month)
, _day(day)
{}
void SetTimeOfDate(int hour, int minute, int second)
{
// 直接访问时间类私有的成员变量
_t._hour = hour;
_t._minute = minute;
_t._second = second;
}
private:
int _year;
int _month;
int _day;
Time _t;
};
proprium;
Optime tibi gratias ago pro inspicienda articulo originali meo.
Articulus hic maxime adhibetur ad discendi et cognitionis communicationem.
Si citare debes, inscriptione indica quaeso.
technologiae technologiae plus quam 30 annos operam dedit et in variis linguis proficit ut java, linux, javascript, php, css, etc. Multas contributiones in aperto fonte campo fecit elit documentorum statione ad communicandas quaestiones in technologia progressus ad futuram referentiam.
