1 // Boost Filesystem path_times.cpp ---------------------------------------------------// 2 3 // Copyright Beman Dawes 2013 4 5 // Distributed under the Boost Software License, Version 1.0. 6 // See http://www.boost.org/LICENSE_1_0.txt 7 8 // Library home page: http://www.boost.org/libs/filesystem 9 10 #include <boost/config/warning_disable.hpp> 11 12 #ifndef BOOST_FILESYSTEM_NO_DEPRECATED 13 # define BOOST_FILESYSTEM_NO_DEPRECATED 14 #endif 15 #ifndef BOOST_SYSTEM_NO_DEPRECATED 16 # define BOOST_SYSTEM_NO_DEPRECATED 17 #endif 18 19 #include <boost/timer/timer.hpp> 20 #include <boost/filesystem/path.hpp> 21 #include <boost/cstdint.hpp> 22 23 #include <boost/config.hpp> 24 # if defined( BOOST_NO_STD_WSTRING ) 25 # error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support 26 # endif 27 28 #include <boost/detail/lightweight_main.hpp> 29 30 namespace fs = boost::filesystem; 31 using namespace boost::timer; 32 33 #include <fstream> 34 #include <iostream> 35 36 using std::cout; 37 using std::endl; 38 39 namespace 40 { 41 boost::int64_t max_cycles; 42 43 template <class STD_STRING> time_ctor(const STD_STRING & s)44 nanosecond_type time_ctor(const STD_STRING& s) 45 { 46 boost::timer::auto_cpu_timer tmr; 47 boost::int64_t count = 0; 48 do 49 { 50 fs::path p(s); 51 ++count; 52 } while (count < max_cycles); 53 54 boost::timer::cpu_times elapsed = tmr.elapsed(); 55 return elapsed.user + elapsed.system; 56 } 57 time_loop()58 nanosecond_type time_loop() 59 { 60 boost::timer::auto_cpu_timer tmr; 61 boost::int64_t count = 0; 62 do 63 { 64 ++count; 65 } while (count < max_cycles); 66 67 boost::timer::cpu_times elapsed = tmr.elapsed(); 68 return elapsed.user + elapsed.system; 69 } 70 } // unnamed namespace 71 72 //--------------------------------------------------------------------------------------// 73 // main // 74 //--------------------------------------------------------------------------------------// 75 cpp_main(int argc,char * argv[])76int cpp_main(int argc, char* argv[]) 77 { 78 if (argc != 2) 79 { 80 cout << "Usage: path_times <cycles-in-millions>\n"; 81 return 1; 82 } 83 84 max_cycles = std::atoi(argv[1]) * 1000000LL; 85 cout << "testing " << std::atoi(argv[1]) << " million cycles" << endl; 86 87 cout << "time_loop" << endl; 88 nanosecond_type x = time_loop(); 89 90 cout << "time_ctor with string" << endl; 91 nanosecond_type s = time_ctor(std::string("/foo/bar/baz")); 92 93 cout << "time_ctor with wstring" << endl; 94 nanosecond_type w = time_ctor(std::wstring(L"/foo/bar/baz")); 95 96 if (s > w) 97 cout << "narrow/wide CPU-time ratio = " << long double(s)/w << endl; 98 else 99 cout << "wide/narrow CPU-time ratio = " << long double(w)/s << endl; 100 101 cout << "returning from main()" << endl; 102 return 0; 103 } 104