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