// -*- C++ -*-

#include <iostream>
#include <string>
#include <vector>

using namespace std;

template<class V, class C> C sum(const V &v, const C &join = C()) {
  typename V::const_iterator p, q;
  C s = C();
  if (v.begin() != v.end()) {
    for (p = q = v.begin(), q++; q != v.end(); p = q, q++) s += *p + join;
    s += *p;
  }
  return s;
}

typedef struct {
  int x, y;
} struct_point;

ostream& operator<<(ostream& os, struct_point p) {
  return os << "{ x = " << p.x << ", y = " << p.y << " }";
}

int main() {
  int i = 1;
  int i2 = i;
  i2++;
  cout << "i2: " << i2 << endl << " i: " << i << endl;

  char *ss = strdup("hello");
  char *ss2 = ss;
  ss2[0] = 'H';
  cout << "ss2: " << ss2 << endl << " ss: " << ss << endl;

  string s = "hello";
  string s2 = s;
  s2[0] = 'H';
  cout << "s2: " << s2 << endl << " s: " << s << endl;

  vector<string> l; l.push_back("hello");
  vector<string> l2 = l;
  l2.push_back("world");
  cout << "l2: " << sum(l2, string(" ")) << endl << "l: " << sum(l, string(" ")) << endl;

  struct_point sp = { 0, 1 };
  struct_point sp2 = sp;
  sp2.x += 1;
  sp2.y += 1;
  cout << "sp2: " << sp2 << endl << " sp: " << sp << endl;
}