foo.LaTeX

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\begin_body

\begin_layout Part*
Лекция 5 - доступ к полям класса, public, private, protected.
\end_layout

\begin_layout Standard
\begin_inset listings
inline false
status open

\begin_layout Plain Layout

class SS{
\end_layout

\begin_layout Plain Layout

	void setA();
\end_layout

\begin_layout Plain Layout

	int getA();
\end_layout

\begin_layout Plain Layout

private:
\end_layout

\begin_layout Plain Layout

	int a;
\end_layout

\begin_layout Plain Layout

} obj1;
\end_layout

\begin_layout Plain Layout

void SS::setA(int value){
\end_layout

\begin_layout Plain Layout

	if(value > 100) value=100;
\end_layout

\begin_layout Plain Layout

	a = value;
\end_layout

\begin_layout Plain Layout

}
\end_layout

\begin_layout Plain Layout

int SS::getA(){
\end_layout

\begin_layout Plain Layout

	return a;
\end_layout

\begin_layout Plain Layout

}
\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset Foot
status collapsed

\begin_layout Plain Layout
То есть мы прячем данные за логикой.
\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset Formula $ax^{2}+bx+c$
\end_inset


\end_layout

\begin_layout Standard
\begin_inset listings
inline false
status open

\begin_layout Plain Layout

class One{
\end_layout

\begin_layout Plain Layout

public:
\end_layout

\begin_layout Plain Layout

	void setA(...);
\end_layout

\begin_layout Plain Layout

	void setB(...);
\end_layout

\begin_layout Plain Layout

	void setC(...);
\end_layout

\begin_layout Plain Layout

vector getRoots();//(x1,x2), then if(roots-is-valide)
\end_layout

\begin_layout Plain Layout

private:
\end_layout

\begin_layout Plain Layout

	bool roots-is-valide;//by default - false
\end_layout

\begin_layout Plain Layout

}
\end_layout

\begin_layout Plain Layout

	void findRoots();// here set roots-in-valide in true.
\end_layout

\end_inset


\begin_inset Foot
status collapsed

\begin_layout Plain Layout
то есть полезно добавлять переменную, отвечающую за состояние изменения
 объекта.
\end_layout

\end_inset


\begin_inset Foot
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\begin_layout Plain Layout
каждый класс - минипрограмма, работающая со своими данными.
\end_layout

\end_inset


\end_layout

\begin_layout Standard
Конструктор - такая функция класса, которая вызывается в момент создания
 объекта.
\end_layout

\begin_layout Standard
\begin_inset listings
inline false
status open

\begin_layout Plain Layout

class Two{
\end_layout

\begin_layout Plain Layout

	sometype x;// то есть выделяется память для x, а затем вызывается конструктор
\end_layout

\begin_layout Plain Layout

	sometype y;
\end_layout

\begin_layout Plain Layout

};
\end_layout

\begin_layout Plain Layout

class One{
\end_layout

\begin_layout Plain Layout

	One();
\end_layout

\begin_layout Plain Layout

	Two a;// инициализируется 1-м
\end_layout

\begin_layout Plain Layout

	Two b//инициализируется 2-м
\end_layout

\begin_layout Plain Layout

};
\end_layout

\begin_layout Plain Layout

One::One(){//на этото момент поля класса уже инициализированны значениями
 по умолчанию для их типов.
\end_layout

\begin_layout Plain Layout

	a = 3;
\end_layout

\begin_layout Plain Layout

	b.selLength(17);
\end_layout

\begin_layout Plain Layout

}
\end_layout

\begin_layout Plain Layout

One obj1;
\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset listings
inline false
status open

\begin_layout Plain Layout

enum Color_t{ RED, YELLOW, BLUE};
\end_layout

\begin_layout Plain Layout

enum Contain{water,sand,rocks};
\end_layout

\begin_layout Plain Layout

class Bucket{
\end_layout

\begin_layout Plain Layout

public:
\end_layout

\begin_layout Plain Layout

	Bucket(Color_t c=Blue, Contain n=Sand){col = c;cont = n;};
\end_layout

\begin_layout Plain Layout

private:
\end_layout

\begin_layout Plain Layout

	Color_t col;
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\begin_layout Plain Layout

	Contain cont;
\end_layout

\begin_layout Plain Layout

public:
\end_layout

\begin_layout Plain Layout

	void setColor(...);
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\begin_layout Plain Layout

	void setContain(...);
\end_layout

\begin_layout Plain Layout

};
\end_layout

\begin_layout Plain Layout

Bucket b1;
\end_layout

\begin_layout Plain Layout

Bucket b2(RED, water);
\end_layout

\begin_layout Plain Layout

class Builder{
\end_layout

\begin_layout Plain Layout

public:
\end_layout

\begin_layout Plain Layout

	Builder(Color_t c, Contain n){
\end_layout

\begin_layout Plain Layout

	bl.setColor(c);
\end_layout

\begin_layout Plain Layout

	bl.setContain(n);
\end_layout

\begin_layout Plain Layout

	br.setColor(c);
\end_layout

\begin_layout Plain Layout

	br.setContain(n);
\end_layout

\begin_layout Plain Layout

}// way one
\end_layout

\begin_layout Plain Layout

	Builder(Color_t c, Contain n): br(c,n), bl(c,n){}// way two
\end_layout

\begin_layout Plain Layout

private:
\end_layout

\begin_layout Plain Layout

	Bucket bl, br;
\end_layout

\begin_layout Plain Layout

};
\end_layout

\end_inset


\begin_inset Foot
status collapsed

\begin_layout Plain Layout
Убрав параметры по-умолчанию, вы не сможете инициализировать объект с параметрам
и по-молчанию.Example: Bucket b;
\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset Graphics
	filename 1.jpeg

\end_inset


\end_layout

\begin_layout Standard
Конструкторы вызываются в порядке A->B->S;
\end_layout

\begin_layout Part*
new и delete
\end_layout

\begin_layout Standard
\begin_inset listings
inline false
status open

\begin_layout Plain Layout

class TypeA{...
\end_layout

\begin_layout Plain Layout

};
\end_layout

\begin_layout Plain Layout

TypeA d;
\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset listings
inline false
status open

\begin_layout Plain Layout

int* p = new int;
\end_layout

\begin_layout Plain Layout

*p = 7;
\end_layout

\begin_layout Plain Layout

*(p+1) = 3;//NO!
\end_layout

\begin_layout Plain Layout

//---------------
\end_layout

\begin_layout Plain Layout

int *p = new int[100];
\end_layout

\begin_layout Plain Layout

*p = 1;
\end_layout

\begin_layout Plain Layout

*(p+99) = 17;
\end_layout

\begin_layout Plain Layout

p[0] = 1;
\end_layout

\begin_layout Plain Layout

p[99] = 17;
\end_layout

\begin_layout Plain Layout

p[100] = 3;// this string not work
\end_layout

\begin_layout Plain Layout

delete []p;//free array memory
\end_layout

\end_inset


\begin_inset Foot
status collapsed

\begin_layout Plain Layout
деструктор - функция без параметров
\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset listings
inline false
status open

\begin_layout Plain Layout

TypeA* pa=new TypeA(7);
\end_layout

\begin_layout Plain Layout

delete pa;
\end_layout

\begin_layout Plain Layout

//--------------------
\end_layout

\begin_layout Plain Layout

\end_layout

\end_inset


\end_layout

\end_body
\end_document