#include <iostream>
#include <string>

std::string ReturnFoo(void) {
  std::string x("foo");
  return x;  // this return might copy
}

int main(int argc, char **argv) {
  std::string a("hello");

  // moves a to b
  std::string b = std::move(a);
  std::cout << "a: " << a << std::endl;
  std::cout << "b: " << b << std::endl;

  // Copy return value into b.
  b = std::move(ReturnFoo());
  std::cout << "b: " << b << std::endl;

  return EXIT_SUCCESS;
}