UtilityPair2, C++ (gcc)

UtilityPair2

//g++  7.4.0

////////////////////////////////////////////////////////////////////////////
//UtilityPair2: understanding std::pair
//this code is created by Rezaul Hoque on August 27,2022;
//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 <iomanip>
#include <string>
#include <strstream>
#include <utility>
#include <vector>
#include <algorithm>
//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::vector<std::pair<std::string ,int>> n={{"zenyth",110},{"asterix",112},{"fountliv",234}};
std::vector<std::pair<std::string ,int>> a;
std::swap(a,n);
std::sort(a.begin (),a.end());
for (auto s:a)
{std::cout<<std::get<0>(s)<<" "<<std::get<1>(s)<<l;
}
std::pair<std::string,std::pair<int,int>> date={"August ",{27,2022}};

std::string m;
int x,y;

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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