viewvector.cpp

#include<iostream>
#include<vector>

using namespace std;


//1
#define view_vector1(vec) for(auto v:vec)cout << vec << " ";cout << endl;

//2
template<typename T>
ostream& operator<<(ostream& stream, vector<T>& vec){
  for(T v:vec)stream << v << " ";
  return stream;
}

int main(){
  vector<int> hoge = {3, 1, 4, 1, 5, 9, 2};
  view_vector1(hoge);
  cout << hoge << endl;
}