How to copy class with pointers elegant way (http://users.livejournal.com/_winnie/32542.html?thread=164126#t164126)

main.cpp

//
//  main.cpp
//  How to copy class with pointers elegant way
//  from: http://users.livejournal.com/_winnie/32542.html?thread=164126#t164126
//
//  Created by Yaroslav Fedorov on 12/01/16.
//  Copyright © 2016 Yaroslav Fedorov. All rights reserved.
//

#include <iostream>
#include <memory>
#include <string.h>

class B
{
    public:
        
        B( std::string name ) : mName(name) {}
    
        inline B* clone() const
        {
            return new B(*this);
        }
    
    private:
        std::string mName;
};

struct Bimple : std::unique_ptr<B>
{
    Bimple() {}
    Bimple(const Bimple &other) : std::unique_ptr<B>( other.get() ? other.get()->clone() : nullptr ){};
    Bimple& operator=(Bimple const &rhs)
    {
        if ( this == &rhs )
            return *this;
        
        Bimple(rhs).swap(*this);
        
        return *this;
    }
};

class A
{
    public:
        Bimple b1, b2;
        std::string s;
    
        void swap(A &other) throw()
        {
            b1.swap(other.b1);
            b2.swap(other.b2);
            s.swap(other.s);
        }
    
        A& operator=(const A& other)
        {
            if ( this == &other )
                return *this;
            
            A(other).swap(*this);
            
            return *this;
        }
};

int main(int argc, const char * argv[])
{
    A a1;
    A a2;
    
    a1.b1.reset(new B("b1-test"));
    a1.b2.reset(new B("b2-test"));
    
    a2 = a1;
    a1 = a1;
}