46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
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// Copyright Oliver Kowalke 2014.
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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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//
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#ifndef CLOCK_H
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#define CLOCK_H
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#include <algorithm>
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#include <cstddef>
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#include <numeric>
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#include <vector>
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#include <boost/assert.hpp>
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#include <boost/chrono.hpp>
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#include <boost/cstdint.hpp>
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typedef boost::chrono::high_resolution_clock clock_type;
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typedef clock_type::duration duration_type;
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typedef clock_type::time_point time_point_type;
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struct clock_overhead
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{
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boost::uint64_t operator()()
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{
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time_point_type start( clock_type::now() );
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return ( clock_type::now() - start).count();
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}
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};
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inline
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duration_type overhead_clock()
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{
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std::size_t iterations( 10);
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std::vector< boost::uint64_t > overhead( iterations, 0);
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for ( std::size_t i = 0; i < iterations; ++i)
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std::generate(
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overhead.begin(), overhead.end(),
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clock_overhead() );
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BOOST_ASSERT( overhead.begin() != overhead.end() );
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return duration_type( std::accumulate( overhead.begin(), overhead.end(), 0) / iterations);
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}
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#endif // CLOCK_H
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