OverloadFunc, C++ (gcc)

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//g++  7.4.0

////////////////////////////////////////////////////////////////////////////
//OverloadFunc: understanding overloading of function call operator, operator()
//this code is created by Rezaul Hoque on July 06,2022;
//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 <algorithm>
class Demo{
int x,y;
public:
int total=0;
Demo(){}
Demo(int a,int b){x=a;y=b;}
Demo(Demo&c){x=c.x;y=c.y;
std::cout<<"\nCopy constructor is in work\n";
}
Demo& operator=(const Demo& c)
{ if (this==&c)
  return *this;
if(this != &c)
{ x=c.x;
  y=c.y;
}

std::cout<<"\nCopy assignment is in work\n";
return *this;
}

Demo(Demo&& t
){
std::cout<<"Move constructor is in work\n";
x=std::move(t.x);
y=std::move(t.y);

}
Demo& operator=(Demo&& ot)
{
if (this==&ot)
  return *this;

if (this != &ot)
{

x=std::move(ot.x);
y=std::move(ot.y);

}
std::cout<<"Move assignment is in work\n";
return * this;
}
int getX(){return x;}
int getY(){return y;}
void operator ()(int w,int z){ total += w*z;}
double operator()(double t){ return total*t+total;}
};

int main()
{
    Demo e1(0,0);
Demo e2,e3;
std::cout<<"Overloading function call operator: \n";
e1(10,5);
double tot=e1(0.5);
std::cout<<e1.total;
std::cout<<"\nSecond overloaded function call operator:\n"<<tot;
e2=e1;
std::cout<<"\ne2.x :"<<e2.getX()<<"e2.y :"<<e2.getY();
e3=Demo(e1);
std::cout<<"\ne3.x :"<<e3.getX()<<"e3.y :"<<e3.getY();

std::cout<<"\ne1.x :"<<e1.getX()<<"e1.y :"<<e1.getY();
return 0;
}

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Compilation time: 0.63 sec, absolute running time: 0.21 sec, cpu time: 0.02 sec, memory peak: 5 Mb, absolute service time: 0,94 sec