The following code example is taken from the book
C++ Move Semantics - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2020
The code is licensed under a Creative Commons Attribution 4.0 International License. Creative Commons License

// raw code

#include <chrono>

// measure num initializations of whatever is currently defined as Person:
std::chrono::nanoseconds measure(int num)
  std::chrono::nanoseconds totalDur{0};
  for (int i = 0; i < num; ++i) {
    std::string fname = "a firstname a bit too long for SSO";
    std::string lname = "a lastname a bit too long for SSO";

    // measure how long it takes to create 3 Persons in different ways:
    auto t0 = std::chrono::steady_clock::now();
      Person p1{"a firstname too long for SSO", "a lastname too long for SSO"};
      Person p2{fname, lname};
      Person p3{std::move(fname), std::move(lname)};
    auto t1 = std::chrono::steady_clock::now();
    totalDur += t1 - t0;
  return totalDur;