C++ . . .
( ) ; . Item, Shape Item Box Circle Shape:
class Item
{
public:
virtual void cut ();
virtual void move (Length deltax, Length deltay) = 0;
virtual Boolean pick (Length px, Length py) = 0;
virtual void ungroup () = 0;
};
class Shape: public Item
{
protected:
Length x;
Length y;
public:
void cut ();
void draw () {write (COLOR_FOREGROUND);};
void erase (); {write (COLOR_BACKGROUND);};
void move (Length deltax, Length deltay);
Boolean pick (Length px, Length py) = 0;
void ungroup () { };
virtual void write (Color color) = 0;
};
class Box: public Shape
{
protected:
Length width;
Length height;
public:
Box (Length x0, Length y0, Length width0, Length height0);
Boolean pick (Length px, Length py);
void write (Color color);
};
class Circle: public Shape
{
protected:
Length radius;
public:
Circle (Length x0, Length y0, Length radius0);
Boolean pick (Length px, Length py);
void write (Color color);
};
( ) (, , ). , private, ; , protected public. , , () , (virtual). , write Shape Box Circle, ; , . 0 (virtual void write (Color color) = 0;), ( ). , , . ( ). , , () , .
C++ : .
C++ . , --- Item Group :
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|
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class Item{
public:
virtual void cut ();
virtual void move (Length deltax, Length deltay) = 0;
virtual Boolean pick (Length px, Length py) = 0;
virtual void ungroup () = 0;
private:
Group* group;
friend Group::add_item (Item*);
friend Group::remove_item (Item*);
public:
Group* get_group () {return group;};
};
class Group: public Item
{
public:
void cut ();
void move (Length deltax, Length deltay);
Boolean pick (Length px, Length py) = 0;
void ungroup () { };
private:
ItemSet* items;
public:
void add_item (Item*);
void remove_item (Item*);
ItemSet* get_items () {return items;}
};
, ( ) , :
void Group::add_item (Item* item)
{
item->group = this;
items->add (item);
}
void Group::remove_item (Item* item);
{
item->group = 0;
items->remove (item);
}
Group::add_item Group::remove_item (private) Item, Group, (friends) Item.
:
- : ;
- - : .
() . ItemSet ( ):
class ItemSet
{
public:
ItemSet(); //
~ItemSet(); //
void add(Item*); //
void remove(Item*); //
Boolean includes(Item*); //
int size(Item*); //
};
. , .. , .
( ). .
5.3.6. C++
C++ ( ). () , , ( , ).
C++ (template). C++ : - -.
- , . - . - - , , , .
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C++ STL (Standard Template Library). C++. D.R.Musser, A.Saini STL Tutorial and Reference Guide. C++ Programming with the Standard Template Library Addison-Wesley, 1996 ( http://www.aw.com/cp/musser-saini.html). STL http://weber.u.washington.edu/~bytewave/bytewave_stl.html http://www.ualberta.ca/~nyu/stl/stl.html. , STL ftp://ftp.cs.rpi.edu/pub/stl.
