// VEC.CXX: An integer vector to illustrate the
// need for the copy-initializer
#include <stdio.h>

class vec {  // an integer vector
  int size;
  int * vp;
public:
  vec(int i = 0, int j = 0);
  vec(vec & rv);
  ~vec() { delete vp; }
  vec operator=(vec & rv);
  void print(char * msg = "");
  int & operator[](int x);
  int length() { return size; }
};

vec::vec(int i, int j) {
  vp = new int[size = i];
  for (int x = 0; x < size; x++)
    vp[x] = j;
}

vec::vec(vec & rv) {
  vp = new int[size = rv.size];
  for (int x = 0; x < size; x++)
    vp[x] = rv.vp[x];
}

vec vec::operator=(vec & rv) {
  delete vp; // release old memory
  vp = new int[size = rv.size];
  for (int x = 0; x < size; x++)
    vp[x] = rv.vp[x];
  return *this;  // return a copy of this object
}

void vec::print(char * msg) {
  printf("%s",msg);
  for(int x = 0; x < size; x++)
    printf("%d ",vp[x]);
  printf("\n");
}

int & vec::operator[](int x) {
  if (x < size)
    return vp[x];
  else {
    puts("vec index out of range");
    exit(1);
  }
}


// pass in by value, return by value:
vec func1(vec value) {
  if (value.length() >= 1)
    value[0] = 0;
  return value;
}

main() {
  vec A(4,3);
  vec B;
  A.print("A: ");
  B.print("B: ");
  B = func1(A);
  A.print("A after func1: ");
  B.print("B after func1: ");
}