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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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