1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// 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 <cstddef>
#include <numeric>
#include <vector>
#include <boost/assert.hpp>
#include <boost/chrono.hpp>
#include <boost/cstdint.hpp>
typedef boost::chrono::high_resolution_clock clock_type;
typedef clock_type::duration duration_type;
typedef clock_type::time_point time_point_type;
struct clock_overhead
{
boost::uint64_t operator()()
{
time_point_type start( clock_type::now() );
return ( clock_type::now() - start).count();
}
};
inline
duration_type overhead_clock()
{
std::size_t iterations( 10);
std::vector< boost::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
|
