ex13_27.h

//
//  ex13_27.h
//  Exercise 13.27
//
//  Created by pezy on 1/20/15.
//  Copyright (c) 2015 pezy. All rights reserved.
//
//  Define your own reference-counted version of HasPtr. 

#ifndef CP5_ex13_27_h
#define CP5_ex13_27_h

#include <string>

class HasPtr {
public:
    HasPtr(const std::string &s = std::string()) : ps(new std::string(s)), i(0), use(new size_t(1)) { }
    HasPtr(const HasPtr &hp) : ps(hp.ps), i(hp.i), use(hp.use) { ++*use; }
    HasPtr& operator=(const HasPtr &rhs) {
        ++*rhs.use;
        if (--*use == 0) {
            delete ps;
            delete use;
        }
        ps = rhs.ps;
        i = rhs.i;
        use = rhs.use;
        return *this;
    }
    ~HasPtr() {
        if (--*use == 0) {
            delete ps;
            delete use;
        }
    } 
private:
    std::string *ps;
    int i;
    size_t *use;
};

#endif