compile visual studio c++ online

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#include <iostream>
#include <string>
#include <vector>
#include <filesystem>
namespace fs = std::tr2::sys ;

std::vector<std::wstring> files_in_directory( fs::wpath path = L".", bool recursive = true )
{
    std::vector<std::wstring> files ;

try
    {
        if( fs::exists(path) ) files.push_back( fs::system_complete(path) ) ;

if( fs::is_directory(path) )
        {
            using iterator = fs::basic_directory_iterator < fs::wpath > ;
            for( iterator iter(path) ; iter != iterator() ; ++iter )
            {
                files.push_back( fs::system_complete( iter->path() ) ) ;
                if( recursive ) 
                    for( const std::wstring& p : files_in_directory( iter->path() ) )
                        files.push_back( std::move(p) ) ;
            }
        }
    }
    
    catch( const std::exception& ) { /* error */ }

return files ;
}

int main()
{
    for( const std::wstring& path : files_in_directory( L"C:\\Windows", false ) ) 
        std::wcout << path << '\n' ;
}

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Compilation time: 1.59 sec, absolute running time: 0.11 sec, absolute service time: 2.02 sec

C:\Windows C:\Windows\AppCompat C:\Windows\apppatch C:\Windows\assembly C:\Windows\AUInstallAgent C:\Windows\bfsvc.exe C:\Windows\Boot C:\Windows\bootstat.dat C:\Windows\Branding C:\Windows\CbsTemp C:\Windows\Cursors C:\Windows\debug C:\Windows\DesktopTileResources C:\Windows\diagnostics C:\Windows\DigitalLocker C:\Windows\DirectAccess C:\Windows\Downloaded Program Files C:\Windows\drivers C:\Windows\DtcInstall.log C:\Windows\ELAMBKUP C:\Windows\en-US C:\Windows\explorer.exe C:\Windows\Fonts C:\Windows\Globalization C:\Windows\Help C:\Windows\HelpPane.exe C:\Windows\hh.exe C:\Windows\iis.log C:\Windows\IME C:\Windows\Inf C:\Windows\Installer C:\Windows\L2Schemas C:\Windows\LiveKernelReports C:\Windows\Logs C:\Windows\media C:\Windows\mib.bin C:\Windows\Microsoft.NET C:\Windows\ModemLogs C:\Windows\Offline Web Pages C:\Windows\Panther C:\Windows\PFRO.log C:\Windows\PLA C:\Windows\PolicyDefinitions C:\Windows\Provisioning C:\Windows\regedit.exe C:\Windows\Registration C:\Windows\RemotePackages C:\Windows\rescache C:\Windows\Resources C:\Windows\SchCache C:\Windows\schemas C:\Windows\security C:\Windows\ServerDataCenter.xml C:\Windows\ServerWeb.xml C:\Windows\ServiceProfiles C:\Windows\servicing C:\Windows\Setup C:\Windows\setupact.log C:\Windows\setuperr.log C:\Windows\SoftwareDistribution C:\Windows\Speech C:\Windows\splwow64.exe C:\Windows\symbols C:\Windows\System C:\Windows\system.ini C:\Windows\System32 C:\Windows\SysWOW64 C:\Windows\TAPI C:\Windows\Tasks C:\Windows\Temp C:\Windows\ToastData C:\Windows\tracing C:\Windows\vmgcoinstall.log C:\Windows\Vss C:\Windows\Web C:\Windows\WID C:\Windows\win.ini C:\Windows\WindowsShell.Manifest C:\Windows\WindowsUpdate.log C:\Windows\WinHelp32.exe C:\Windows\winhlp32.exe C:\Windows\WinSxS C:\Windows\write.exe