Revise the program you wrote in the exercises in § 6.3.2 (p. 228) that used recursion to print the contents of a vector to conditionally print information about its execution. For example, you might print the size of the vector on each call

#include <vector>
#include <iostream>

void printVecInt(const std::vector<int>::iterator bg,
                 const std::vector<int>::iterator ed) {
#ifndef NDEBUG
  std::cout << "In function: " << __func__ << ", "
            << "Vector size: " << ed - bg << std::endl;
#endif
  if (bg == ed)
    return;
  std::cout << *bg << std::endl;
  printVecInt(bg + 1, ed);
}

int main() {
  std::vector<int> vi;
  int i;
  while (std::cin >> i)
    vi.push_back(i);

  printVecInt(vi.begin(), vi.end());

  return 0;
}