MovConstrAssign, C++ (gcc)

MovConstrAssign

//g++  7.4.0
//////////////////////////////////////////////////////////////////////////////
//MovConstrAssign: understanding Move constructor and assignment
//this code is created by Rezaul Hoque on June 23,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <string>
class C{
std::string s;
public:
C(std::string a){s=a;}

C(C& c){std::cout<<"Copy constructor in work\n";
s=c.s;}
~C(){}
std::string getS(){return s;}
};
class M{

std::string* m;
public:
M(std::string z){ m=new std::string;
 *m=z;}
M(M&& ot
): m(nullptr){

m=ot.m;
ot.m=nullptr;
}
M& operator=(M&& ot)
{
if (this != &ot)
{
 delete m;
m=ot.m;
ot.m=nullptr;
}
std::cout<<"Move assignment is in work\n";
return * this;
}
std::string getM(){ return * m;}
};
std::string getStr(){
std::string s="Hi\n";
return s;
}
class N :public M{
public: 
std::string* n;
};
class O: N{
public:
~O(){}//destructor blocks move constructor and assignment
};
int main()
{
  C a("hi\n");
std::cout<<a.getS();
//Move constructor
M z=getStr();
std::cout<<z.getM();
//Move assignment operator
M g("there\n");
g=getStr();
std::cout<<g.getM();

return 0;
}


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