{
x=_x;
y=_y;
}
void putinfo(int &xx,int &yy)
{
xx=x;
yy=y;
}
};
Void main()
{
Coord arg;
coord*p=&arg;
arg.get_info(10,5);// . -
Int col,row;
p->putinfo(col,row);// -> -
}
18
: , , , . , .. . - () ( , ).
- ()
_ (_:: *_)();
, . *, à*.
#include <stdio.h>
class A
{
public:
void f1()
{
puts (!);
}
void f2()
{
puts (!);
}
};
void main()
{
void (A::pf)()=&A::f1;
/* pf - f1()*/
A q; //q
A*pA=&q; // q
(q.*pf)(); / q.f1();
pf=&A::f2; //B pf f2().
(q.*pf)(); //q.f2();
(pAà*pf)(); /* q. pf f2(). f2() q, .. q.f2()*/
}
this
() , , . ++ this. , , , . this (return this) (return *this) .
this .
-
, , , . . -: , , , , .
, . , . . . , const, volatile, static, virtual.
,
_ ()
{
}
.. .
, , . , , , , . , . ( ) , .
|
|
|
class coord
{
float x, y;
public:
coord (float a, float b)
{
x=a;
y=b;
}
};
void main ()
{
coord w (2.5, 12.3);
}
w coord . b 2.5 12.3.
, . (:) - ( ), .
.
class coord
{
const float x,y;
public:
coord(float a, float b):x(a),y(b)
{
}
};
void main()
{
coord w(2.5, 12.3);
}
- , . , ( ) .
.
class coord
{
const float x,y;
public:
coord(float a, float b):x(a),y(b)
{
}
};
class map
{
coord w;
public:
map (float_x, float_y):w(_x,_y)
{
}
};
void main ()
{
map q(1Ø,15); // q map // x(a), x(b)
}
.
(const _ &) (_ &).
_ (const _&__)
_ (_&__).
, .
, ( ).
( ), . . , .
#include <stdio.h>
class point
{
float x,y;
public:
point (float a, float b)
{
x=a;
y=b;
}
point (const point &src)
{
x=src.x;
y=src.y;
}
};
void main()
{
point v(2.43, 8.1);
point w=v;
}
v point , -. v.x=2.43, v.y=8.1.
w point . src v. w.x=2.43, w.y=8.1.
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|
|
! , private. , , . - .
- operator=. const _& _&. :
_& operator=(const _ &x)
_& operator=(_ &x).
, const - , .
, . , , . , :
x=y=b;
, . . , .
.
class comp
{
float Re, Im;
public:
comp (float a, float b):Re(a),Im(b)
{
}
comp& operator=(const comp& src)
{
Re=src.Re;
Im=src.Im;
return *this;
}
comp (const comp& x)
{
Re=x.Re;
Im=x.Im;
};
void main()
{
comp x(1,2), y(-Ø.5,1.25);
comp z=x; //
comp v,w; //
v=w=y; // operator=()
}
, v=w=y;
= - operator=(). ,
const comp& src operator=().
w this - . , return*this w.Re=- Ø.5; w.Im=1.25.
operator=(). w, v this . .
return*this, , operator=() .
! , operator=() private.
. , , - (~). , .
~_()
:
1) ;
2) ;
3) ;
4) const, volatile, static.
, .
:
1) ;
2) ;
3) delete , .
, _. ~ _ ();
, s. ~ tree (); s tree.
this > ~ tree (); tree, tris.
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(int, long, char .) . . , .
