UtilityPair, C++ (gcc)

UtilityPair

//g++  7.4.0

//////////////////////////////////////////////////////////////////////////////
//UtilityPair: understanding std::pair
//this code is created by Rezaul Hoque on August 26,2022;update: 14:58
//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 <iomanip>
#include <string>
#include <strstream>
#include <utility>
//stream manipulator
std::ostream& l(std::ostream& os)
{
  return (os<<"\n");
}
namespace Pat {
void fill(char c)
{
std::cout.width(40);
std::cout.fill(c);
std::cout<<l;
}
void left(int n,char c){
std::cout.setf(std::ios::left);
std::cout.fill(c);
std::cout.width(n);
}
void right(int n,char c){
std::cout.setf(std::ios::right);
std::cout.fill(c);
std::cout.width(n);
}
}
int main ()
{
Pat::fill('&');
std::pair<std::string ,int> a("zenyth",110);
std::pair<std::string,int> c=std::make_pair("asterix",112);

std::pair<std::string,int> b,d;
std::pair<std::string,std::pair<int,int>> date={"August ",{26,2022}};

b.first="fountliv";
b.second=234;
d=b;
std::string m;
int x,y;
Pat::left(18,' ');
std::cout<<"City"<<"Code\n";
Pat::left(18,'.');
std::cout<<a.first<<a.second<<l;
Pat::left(18,'.');
std::cout<<c.first<<c.second<<l;

Pat::left(18,'.');
std::cout<<d.first<<d.second<<l;

m=date.first;
std::tie(x,y)=date.second;
Pat::right(25,' ');
std::cout<<m<<","<<x<<" "<<y<<l;
Pat::fill('&');
return 0;
}


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