- . , . , , - . .
- ()
1980 Smalltalk-80, - Xerox. - . .
- : , , , .
, , . .
( ).
- .
- ( ) , , . , . - , , .
- , .
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3. 3. - ++
, .
(encapsulation). . , , , , . . , , .
|
|
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:
class _ {_};
( member) (-, ), ( , -), .
, . .
, .
private
public .
protected ( ).
private. .
class CStr
{
char * s;
int len;
public:
CStr () {len=0; s=new char; *s=\0;}
CStr (char *);
char * get_str() {return s;}
int get_len(){return len;}
}
, (inline). . , .
CStr::Cstr(char * st)
{len=strlen(st); s=new (char[len+1]); strcpy(s,st); s[len]=\0;}
, .
_ _ [( )];
, . ( , ). . , void. . , . .
Str s1,s2;
CStr s3(aaa);
, .
.
cout<<s1.get_str();
, ->.
, , , , .
, , , . ~ . , . , . , . , , .
Str::~Csrt(){delete [] s};
++ , . . (-) :
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|
- , ;
- ;
- ( =), , static;
- , , , , , .
bool operator ==(CStr & s1, CStr& s2)
{
if (s1.get_len()==s2.get_len())
{ int i=0;
while (i<s1.get_len() && s1.get_str()[i]==s2.get_str()[i]) i++;
if (i==s1.get_len()) return true;
}
return false;
}
, . . friend . . . .
friend ostream& opertor << (ostream& out, CStr& st)
{return out<<st.s;}
, .
, ( , ) (, ), . ( ). ++ .
-
lass : [private| protected | public]
private ( private). Public - . Protected - protected, private.
class CBStr: public CStr
{
public:
CBStr(char* a);
CBStr(char a);
};
private, public. ,
class CBStr: public CStr
{
public:
Str::s;
.
};
, , protected.
. , . .
CBStr::CBStr(char* a):CStr (a)
{
if (!binarnost(a)) empty();
}
binarnost() , empty () , .
void CStr::empty()
{ if (*s!= '\0') { len = 1; delete []ch; ch = new char; ch[0] = '\0';} }
protected, .
, .
- . , , .
- , , .
