ex13_30.h

//
//  ex13_30.h
//  Exercise 13.30 
//
//  Created by pezy on 1/23/15.
//  Copyright (c) 2015 pezy. All rights reserved.
//
//  Write and test a swap function for your valuelike version of HasPtr. 
//  Give your swap a print statement that notes when it is executed. 
//
//  See ex13_22.h 

#ifndef CP5_ex13_11_h
#define CP5_ex13_11_h

#include <string>
#include <iostream>

class HasPtr {
public:
    friend void swap(HasPtr&, HasPtr&);
    HasPtr(const std::string &s = std::string()) : ps(new std::string(s)), i(0) { }
    HasPtr(const HasPtr &hp) : ps(new std::string(*hp.ps)), i(hp.i) { }
    HasPtr& operator=(const HasPtr &hp) {
        auto new_p = new std::string(*hp.ps);
        delete ps;
        ps = new_p;
        i = hp.i;
        return *this;
    }
    ~HasPtr() {
        delete ps;
    } 
    
    void show() { std::cout << *ps << std::endl; }
private:
    std::string *ps;
    int i;
};

void swap(HasPtr& lhs, HasPtr& rhs)
{
    using std::swap;
    swap(lhs.ps, rhs.ps);
    swap(lhs.i, rhs.i);
    std::cout << "call swap(HasPtr& lhs, HasPtr& rhs)" << std::endl;
}

#endif