timer.hpp
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///////////////////////////////////////////////////////////////
// Copyright Beman Dawes 1994-99.
// Copyright 2020 John Maddock.
// Copyright 2022 Christopher Kormanyos.
// Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_MP_TIMER_HPP
#define BOOST_MP_TIMER_HPP
#include <chrono>
// This file now reflects the 2022 work-over. We have replaced the
// original timer facility (which had been based on std::clock())
// with C++11's equivalent <chrono> counterparts.
namespace boost { namespace multiprecision { namespace test_detail {
template <class ClockType = std::chrono::high_resolution_clock>
struct stopwatch;
template <class ResultType,
class ClockType = std::chrono::high_resolution_clock>
class timer_template;
template <class ClockType>
struct stopwatch
{
private:
using clock_type = ClockType;
public:
using duration_type = typename clock_type::duration;
stopwatch() : m_start(clock_type::now()) { }
stopwatch(const stopwatch& other) : m_start(other.m_start) { }
stopwatch(stopwatch&& other) noexcept : m_start(other.m_start) { }
auto operator=(const stopwatch& other) -> stopwatch&
{
if(this != &other)
{
m_start = other.m_start;
}
return *this;
}
auto operator=(stopwatch&& other) noexcept -> stopwatch&
{
m_start = other.m_start;
return *this;
}
~stopwatch() { }
auto elapsed() const -> duration_type
{
return (clock_type::now() - m_start);
}
auto elapsed_max() const -> duration_type
{
return (std::chrono::time_point<clock_type>::max)() - m_start;
}
static constexpr auto elapsed_min() -> duration_type
{
return (std::chrono::time_point<clock_type>::min)() - std::chrono::time_point<clock_type>();
}
void reset()
{
m_start = clock_type::now();
}
private:
typename clock_type::time_point m_start;
};
template <class ResultType,
class ClockType>
class timer_template : public stopwatch<ClockType>
{
private:
using clock_type = ClockType;
using base_class_type = stopwatch<clock_type>;
public:
using result_type = ResultType;
timer_template() { }
~timer_template() { }
void restart() { base_class_type::reset(); }
auto elapsed() const -> result_type
{
// Return the elapsed time in seconds.
return std::chrono::duration_cast<std::chrono::duration<result_type>>(base_class_type::elapsed()).count();
}
auto elapsed_max() const -> result_type
{
return std::chrono::duration_cast<std::chrono::duration<result_type>>(base_class_type::elapsed_max()).count();
}
static constexpr auto elapsed_min() -> result_type
{
return std::chrono::duration_cast<std::chrono::duration<result_type>>(base_class_type::elapsed_min()).count();
}
static constexpr result_type seconds(result_type s) { return static_cast<result_type>(s * static_cast<result_type>(1)); }
};
} // namespace test_detail
} // namespace multiprecision
} // namespace boost
// TODO: Might prefer to have the relatively common
// name "timer" to be shielded with a namespace.
using timer = boost::multiprecision::test_detail::timer_template<double, std::chrono::high_resolution_clock>;
#endif // BOOST_MP_TIMER_HPP