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// Copyright Oliver Kowalke 2009.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef ZEIT_H
#define ZEIT_H
#include <time.h>
#include <algorithm>
#include <numeric>
#include <cstddef>
#include <vector>
#include <boost/assert.hpp>
#include <boost/bind.hpp>
#include <boost/cstdint.hpp>
typedef boost::uint64_t zeit_t;
inline
zeit_t zeit()
{
timespec t;
::clock_gettime( CLOCK_PROCESS_CPUTIME_ID, & t);
return t.tv_sec * 1000000000 + t.tv_nsec;
}
struct measure_zeit
{
zeit_t operator()()
{
zeit_t start( zeit() );
return zeit() - start;
}
};
inline
zeit_t overhead_zeit()
{
std::size_t iterations( 10);
std::vector< zeit_t > overhead( iterations, 0);
for ( std::size_t i( 0); i < iterations; ++i)
std::generate(
overhead.begin(), overhead.end(),
measure_zeit() );
BOOST_ASSERT( overhead.begin() != overhead.end() );
return std::accumulate( overhead.begin(), overhead.end(), 0) / iterations;
}
#endif // ZEIT_H
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