rcstring.h
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#ifndef __RCSTRING_H__
#define __RCSTRING_H__
#include <string.h>
#include <stdio.h>
#include <malloc.h>
#include <iostream>
using namespace std;
class rcstring{
struct rctext;
rctext* data;
public:
class Range{};
class Cref;
rcstring();
rcstring(const char*);
rcstring(const rcstring&);
~rcstring();
rcstring& operator=(const char*);
rcstring& operator=(const rcstring&);
rcstring& operator+=(const rcstring &);
rcstring operator+(const rcstring &) const;
friend ostream& operator<<(ostream&, const rcstring&);
void check (unsigned int i) const;
char read(unsigned int i) const;
void write(unsigned int i, char c);
char operator[](unsigned int i) const;
Cref operator[](unsigned int i);
unsigned int getRefCount();
};
struct rcstring::rctext
{
char* s;
unsigned int size;
unsigned int n;
rctext(unsigned int nsize, const char* p)
{
n=1;
size=nsize;
s=new char[size+1];
strncpy(s,p,size);
s[size]='\0';
};
~rctext()
{
delete [] s;
};
rctext* detach()
{
if(n==1)
return this;
rctext* t=new rctext(size, s);
n--;
return t;
};
void assign(unsigned int nsize, const char *p)
{
if(size!=nsize)
{
char* ns=new char[size+1];
size = nsize;
strncpy(ns,p,size);
delete [] s;
size = nsize;
s = ns;
}
else
strncpy(s,p,size);
s[size]='\0';
}
private:
rctext(const rctext&);
rctext& operator=(const rctext&);
};
class rcstring::Cref
{
friend class rcstring;
rcstring& s;
int i;
Cref (rcstring& ss, unsigned int ii): s(ss), i(ii) {};
public:
operator char() const
{
cout << "operator char() const"<<endl;
return s.read(i);
}
rcstring::Cref& operator = (char c)
{
cout << "void operator = (char c)"<<endl;
s.write(i,c);
return *this;
};
rcstring::Cref& operator = (const Cref& ref)
{
return operator= ((char)ref);
};
};
inline rcstring::rcstring()
{
data = new rctext(0,"");
}
inline rcstring::rcstring(const rcstring& x)
{
x.data->n++;
data=x.data;
}
inline rcstring::~rcstring()
{
if(--data->n==0)
delete data;
}
rcstring& rcstring::operator=(const rcstring & x)
{
x.data->n++;
if(--data->n == 0)
delete data;
data=x.data;
return *this;
}
rcstring::rcstring(const char* s)
{
data=new rctext(strlen(s),s);
}
rcstring& rcstring::operator=(const char* s)
{
if(data->n==1)
data->assign(strlen(s),s);
else
{
rctext* t = new rctext(strlen(s),s);
data->n--;
data= t;
};
return *this;
}
ostream& operator << (ostream& o, const rcstring& s)
{
return o<<s.data->s;
}
rcstring& rcstring::operator+=(const rcstring & s)
{
int newsize=data->size+s.data->size;
rctext *newdata=new rctext(newsize,data->s);
strcat(newdata->s,s.data->s);
if(--data->n==0)
delete data;
data = newdata;
return *this;
}
rcstring rcstring::operator+(const rcstring & s) const
{
return rcstring(*this)+=s;
}
inline void rcstring::check (unsigned int i) const
{
if(data->size<=i)
throw Range();
}
inline char rcstring::read(unsigned int i) const
{
return data->s[i];
}
inline void rcstring::write(unsigned int i, char c)
{
data = data->detach();
data->s[i] = c;
}
char rcstring::operator[](unsigned int i) const
{
cout << "char rcstring::operator[](unsigned int i) const"<<endl;
check(i);
return data->s[i];
}
rcstring::Cref rcstring::operator[](unsigned int i)
{
cout << "Cref rcstring::operator[](unsigned int i)"<<endl;
check(i);
return Cref(*this,i);
}
unsigned int rcstring::getRefCount()
{
return data->n;
}
#endif /* __RCSTRING_H__ */