text: /*
   * Copyright (c) 2017-2018, The Alloy Developers.
   * Portions Copyright (c) 2012-2017, The CryptoNote Developers, The Bytecoin Developers.
   *
   * This file is part of Alloy.
   *
   * This file is subject to the terms and conditions defined in the
   * file 'LICENSE', which is part of this source code package.
   */
  
  #pragma once
  
  #include <iostream>
  #include <stdint.h>
  
  #include <boost/chrono.hpp>
  
  class performance_timer
  {
  public:
    typedef boost::chrono::high_resolution_clock clock;
  
    performance_timer()
    {
      m_base = clock::now();
    }
  
    void start()
    {
      m_start = clock::now();
    }
  
    int elapsed_ms()
    {
      clock::duration elapsed = clock::now() - m_start;
      return static_cast<int>(boost::chrono::duration_cast<boost::chrono::milliseconds>(elapsed).count());
    }
  
  private:
    clock::time_point m_base;
    clock::time_point m_start;
  };
  
  
  template <typename T>
  class test_runner
  {
  public:
    test_runner()
      : m_elapsed(0)
    {
    }
  
    bool run()
    {
      T test;
      if (!test.init())
        return false;
  
      performance_timer timer;
      timer.start();
      warm_up();
      std::cout << "Warm up: " << timer.elapsed_ms() << " ms" << std::endl;
  
      timer.start();
      for (size_t i = 0; i < T::loop_count; ++i)
      {
        if (!test.test())
          return false;
      }
      m_elapsed = timer.elapsed_ms();
  
      return true;
    }
  
    int elapsed_time() const { return m_elapsed; }
  
    int time_per_call() const
    {
      static_assert(0 < T::loop_count, "T::loop_count must be greater than 0");
      return m_elapsed / T::loop_count;
    }
  
  private:
    /**
     * Warm up processor core, enabling turbo boost, etc.
     */
    uint64_t warm_up()
    {
      const size_t warm_up_rounds = 1000 * 1000 * 1000;
      m_warm_up = 0;
      for (size_t i = 0; i < warm_up_rounds; ++i)
      {
        ++m_warm_up;
      }
      return m_warm_up;
    }
  
  private:
    volatile uint64_t m_warm_up;  ///<! This field is intended for preclude compiler optimizations
    int m_elapsed;
  };
  
  template <typename T>
  void run_test(const char* test_name)
  {
    test_runner<T> runner;
    if (runner.run())
    {
      std::cout << test_name << " - OK:\n";
      std::cout << "  loop count:    " << T::loop_count << '\n';
      std::cout << "  elapsed:       " << runner.elapsed_time() << " ms\n";
      std::cout << "  time per call: " << runner.time_per_call() << " ms/call\n" << std::endl;
    }
    else
    {
      std::cout << test_name << " - FAILED" << std::endl;
    }
  }
  
  #define QUOTEME(x) #x
  #define TEST_PERFORMANCE0(test_class)         run_test< test_class >(QUOTEME(test_class))
  #define TEST_PERFORMANCE1(test_class, a0)     run_test< test_class<a0> >(QUOTEME(test_class<a0>))
  #define TEST_PERFORMANCE2(test_class, a0, a1) run_test< test_class<a0, a1> >(QUOTEME(test_class) "<" QUOTEME(a0) ", " QUOTEME(a1) ">")
  