Move CTR Bench.cpp

#include <chrono>
#include <iostream>
#include <vector>


using namespace std;

template<typename T>
uint64_t time_it_us(const T& t) {
  auto begin = std::chrono::high_resolution_clock::now();
  t();
  auto end = std::chrono::high_resolution_clock::now();
  return std::chrono::duration_cast<std::chrono::microseconds>
    (end-begin).count();
}

struct A {
  A(std::vector<int> v) : v_{std::move(v)} {}

  std::vector<int> v_;
};

struct B {
  // B(const std::vector<int>& v) : v_{v} {}
  B(std::vector<int>&& v) : v_{v} {}

  std::vector<int> v_;
};


int main() {
  std::vector<int> v1, v2;
  for (int i = 0; i < 1000000; ++i) {
    v1.push_back(i);
    v2.push_back(i);
  }

  auto by_val = [&v1] () {
    A a{std::move(v1)};
  };
  auto by_uref = [&v2] () {
    B b{std::move(v2)};
  };

  std::cout << "by val: " << time_it_us(by_val) << "\n";
  std::cout << "by uref: " << time_it_us(by_uref) << "\n";
  return 0;
}