46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
///////////////////////////////////////////////////////////////
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// Copyright Beman Dawes 1994-99.
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// Copyright 2020 John Maddock. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
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#include <ctime>
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#include <limits>
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//
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// This file archives the old (now deprecated) Boost.Timer.
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// It is however, all that we need for a simple timeout.
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//
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// TODO: replace with std::chrono once we remove C++03
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// support in 2021.
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//
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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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// timer( const timer& src ); // post: elapsed()==src.elapsed()
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// ~timer(){}
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// timer& operator=( const timer& src ); // post: elapsed()==src.elapsed()
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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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{
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return double(std::clock() - _start_time) / CLOCKS_PER_SEC;
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}
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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)()) - 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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{
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return double(1) / double(CLOCKS_PER_SEC);
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}
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private:
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std::clock_t _start_time;
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}; // timer
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