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// Boost Filesystem path_times.cpp ---------------------------------------------------//
// Copyright Beman Dawes 2013
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
// Library home page: http://www.boost.org/libs/filesystem
#include <boost/config/warning_disable.hpp>
#ifndef BOOST_FILESYSTEM_NO_DEPRECATED
# define BOOST_FILESYSTEM_NO_DEPRECATED
#endif
#ifndef BOOST_SYSTEM_NO_DEPRECATED
# define BOOST_SYSTEM_NO_DEPRECATED
#endif
#include <boost/timer/timer.hpp>
#include <boost/filesystem/path.hpp>
#include <boost/cstdint.hpp>
#include <boost/config.hpp>
# if defined( BOOST_NO_STD_WSTRING )
# error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support
# endif
#include <boost/detail/lightweight_main.hpp>
namespace fs = boost::filesystem;
using namespace boost::timer;
#include <fstream>
#include <iostream>
using std::cout;
using std::endl;
namespace
{
boost::int64_t max_cycles;
template <class STD_STRING>
nanosecond_type time_ctor(const STD_STRING& s)
{
boost::timer::auto_cpu_timer tmr;
boost::int64_t count = 0;
do
{
fs::path p(s);
++count;
} while (count < max_cycles);
boost::timer::cpu_times elapsed = tmr.elapsed();
return elapsed.user + elapsed.system;
}
nanosecond_type time_loop()
{
boost::timer::auto_cpu_timer tmr;
boost::int64_t count = 0;
do
{
++count;
} while (count < max_cycles);
boost::timer::cpu_times elapsed = tmr.elapsed();
return elapsed.user + elapsed.system;
}
} // unnamed namespace
//--------------------------------------------------------------------------------------//
// main //
//--------------------------------------------------------------------------------------//
int cpp_main(int argc, char* argv[])
{
if (argc != 2)
{
cout << "Usage: path_times <cycles-in-millions>\n";
return 1;
}
max_cycles = std::atoi(argv[1]) * 1000000LL;
cout << "testing " << std::atoi(argv[1]) << " million cycles" << endl;
cout << "time_loop" << endl;
nanosecond_type x = time_loop();
cout << "time_ctor with string" << endl;
nanosecond_type s = time_ctor(std::string("/foo/bar/baz"));
cout << "time_ctor with wstring" << endl;
nanosecond_type w = time_ctor(std::wstring(L"/foo/bar/baz"));
if (s > w)
cout << "narrow/wide CPU-time ratio = " << long double(s)/w << endl;
else
cout << "wide/narrow CPU-time ratio = " << long double(w)/s << endl;
cout << "returning from main()" << endl;
return 0;
}
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