text: #include "examples/cpp/hello-lib.h"
  
  #include <string>
  
  using hello::HelloLib;
  using std::string;
  
  /**
   * This prints "Hello world". If it is run with arguments, it will use the first
   * argument instead of "world". Build and run //examples/cpp:hello-world to see
   * this program in action.
   *
   * This file does double-duty as a "test." It is a cc_binary, so it can also be
   * compiled as a cc_test and Bazel will decide on whether it passed or failed
   * based on exit code (which is always 0 here, so the test "passes"). See
   * hello-fail.cc for an example of making a test fail.
   */
  int main(int argc, char** argv) {
    HelloLib lib("Hello");
    string thing = "world";
    if (argc > 1) {
      thing = argv[1];
    }
    lib.greet(thing);
    return 0;
  }
  