#include <iostream>

struct foo
{
  foo() : val(0) {}
  foo(int x) : val(x) {}
  int val;
};

struct bar
{
  bar() : val(0) {}
  explicit bar(int x) : val(x) {}
  int val;
};


int main(int argc, char** argv)
{
  // call converting constructor for foo
  foo f = 3;
  std::cout << f.val << std::endl;

  // must cast to call converting cnostructor for bar, because it is declared explicit
  bar b = static_cast<bar>(5);
  std::cout << b.val << std::endl;

  return 0;
}