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02e1c566f7
We're not using Boost.Timer v2 components to avoid linking tests with its separately compiled binary. The legacy boost::timer is fine for the test purposes.
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
// Copyright Andrey Semashev 2023.
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// This file is a copy of boost/timer.hpp from Boost.Timer v1, which
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// was deprecated and slated for removal. We are not using Boost.Timer v2
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// components to avoid having to link with its binary.
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//
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// See http://www.boost.org/libs/timer for documentation.
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#ifndef BOOST_PARAMETER_TEST_TIMER_HPP
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#define BOOST_PARAMETER_TEST_TIMER_HPP
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#include <ctime>
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#include <limits>
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namespace test {
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// timer -------------------------------------------------------------------//
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// A timer object measures elapsed time.
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// It is recommended that implementations measure wall clock rather than CPU
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// time since the intended use is performance measurement on systems where
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// total elapsed time is more important than just process or CPU time.
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// Warnings: The maximum measurable elapsed time may well be only 596.5+ hours
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// due to implementation limitations. The accuracy of timings depends on the
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// accuracy of timing information provided by the underlying platform, and
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// this varies a great deal from platform to platform.
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class timer
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{
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public:
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timer() { _start_time = std::clock(); } // postcondition: elapsed()==0
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void restart() { _start_time = std::clock(); } // post: elapsed()==0
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double elapsed() const // return elapsed time in seconds
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{ return double(std::clock() - _start_time) / CLOCKS_PER_SEC; }
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double elapsed_max() const // return estimated maximum value for elapsed()
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// Portability warning: elapsed_max() may return too high a value on systems
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// where std::clock_t overflows or resets at surprising values.
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{
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return (double((std::numeric_limits<std::clock_t>::max)())
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- double(_start_time)) / double(CLOCKS_PER_SEC);
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}
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double elapsed_min() const // return minimum value for elapsed()
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{ return double(1)/double(CLOCKS_PER_SEC); }
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private:
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std::clock_t _start_time;
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}; // timer
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} // namespace test
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#endif // BOOST_PARAMETER_TEST_TIMER_HPP
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