list all files with extensions that match a regex, C++ (vc++)

list all files with extensions that match a regex

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#include <iostream>
#include <string>
#include <vector>
#include <experimental/filesystem>
#include <regex>
#include <type_traits>

namespace fs = std::experimental::filesystem ;

// list of paths of all files under the directory 'dir' when the extenstion matches the regex
// file_list<true> searches recursively into sub-directories; file_list<false> searches only the specified directory
template < bool RECURSIVE > std::vector<fs::path> file_list( fs::path dir, std::regex ext_pattern )
{
    std::vector<fs::path> result ;

using iterator = std::conditional< RECURSIVE, 
                                       fs::recursive_directory_iterator, fs::directory_iterator >::type ;

const iterator end ;
    for( iterator iter { dir } ; iter != end ; ++iter )
    {
        const std::string extension = iter->path().extension().string() ;
        if( fs::is_regular_file(*iter) && std::regex_match( extension, ext_pattern ) ) result.push_back( *iter ) ;
    }
    
    return result ;
}

// literal '.' followed by one of "cpp", "cc", "cxx", "h", "hh", "hpp" or "hxx"
// note: ?: indicates that it is a non-capturing group
static const std::regex cpp_files( "\\.(?:cpp|cc|cxx|h|hh|hpp|hxx)" ) ;

// non-recursive scan for c++ files: if dir is omitted, current directory is scanned 
std::vector<fs::path> scan_cpp_files( fs::path dir = "." ) { return file_list<false>( dir, cpp_files ) ; }

// recursive scan for c++ files: if dir is omitted, current directory is scanned 
std::vector<fs::path> rscan_cpp_files( fs::path dir = "." ) { return file_list<true>( dir, cpp_files ) ; }

int main()
{
    const fs::path win_dir = "C:/Windows/" ; // adjust as required
    
    // print files with extension ".log" or ".ini" in the directory win_dir (non-recursive)
    for( const auto& file_path : file_list<false>( win_dir, std::regex( "\\.(?:log|ini)" ) ) )
         std::cout << file_path << '\n' ;
    std::cout << "\n----------------------------------------------\n" ;

// print files with extension ".log" in the directory "C:/Windows/Logs" (recursive)
    for( const auto& file_path : file_list<true>( win_dir/"Logs", std::regex( "\\.(?:log|ini)" ) ) )
        std::cout << file_path << '\n' ;
    std::cout << "\n----------------------------------------------\n" ;

// print all c++ files the current directory (non-recursive)
    for( const auto& file_path : scan_cpp_files() )
        std::cout << file_path << '\n' ;
    std::cout << "\n----------------------------------------------\n" ;

const fs::path vc_crt_src = "C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/crt/src" ;
    // print all c++ files in the directory vc_crt_src (recursive)
    for( const auto& file_path : rscan_cpp_files(vc_crt_src) )
        std::cout << file_path.parent_path().stem() / file_path.filename() << '\n' ;
    std::cout << "\n----------------------------------------------\n" ;
}

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Compilation time: 2,63 sec, absolute running time: 1,77 sec, absolute service time: 4,41 sec

Warning(s):

Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

C:\Windows\autologon.log C:\Windows\DtcInstall.log C:\Windows\iis.log C:\Windows\PFRO.log C:\Windows\Sandboxie.ini C:\Windows\setupact.log C:\Windows\setuperr.log C:\Windows\system.ini C:\Windows\vmgcoinstall.log C:\Windows\win.ini C:\Windows\WindowsUpdate.log ---------------------------------------------- C:\Windows\Logs\CBS\CBS.log C:\Windows\Logs\CBS\CbsPersist_20170712023305.log C:\Windows\Logs\CBS\FilterList.log C:\Windows\Logs\DISM\dism.log C:\Windows\Logs\DPX\setupact.log C:\Windows\Logs\DPX\setuperr.log C:\Windows\Logs\parallels.log ---------------------------------------------- .\rasctrnm.h ---------------------------------------------- amd64\dllsupp.cpp amd64\ehstate.cpp amd64\trnsctrl.cpp arm\ehstate.cpp arm\trnsctrl.cpp concrt\Agent.cpp concrt\align.h concrt\CacheLocalScheduleGroup.cpp concrt\CacheLocalScheduleGroup.h concrt\cds_cache_aligned_allocator.cpp concrt\cds_cache_aligned_allocator.h concrt\Chores.cpp concrt\collections.h concrt\concrtinternal.h concrt\concurrent_hash.cpp concrt\concurrent_queue.cpp concrt\concurrent_vector.cpp concrt\Context.cpp concrt\ContextBase.cpp concrt\ContextBase.h concrt\CurrentScheduler.cpp concrt\event.cpp concrt\Exceptions.cpp concrt\ExecutionResource.cpp concrt\ExecutionResource.h concrt\ExternalContextBase.cpp concrt\ExternalContextBase.h concrt\FairScheduleGroup.cpp concrt\FairScheduleGroup.h concrt\FreeThreadProxy.cpp concrt\FreeThreadProxy.h concrt\FreeVirtualProcessorRoot.cpp concrt\FreeVirtualProcessorRoot.h concrt\HillClimbing.cpp concrt\HillClimbing.h concrt\InternalContextBase.cpp concrt\InternalContextBase.h concrt\location.cpp concrt\Mailbox.h concrt\Platform.cpp concrt\Platform.h concrt\ppl.cpp concrt\RealizedChore.cpp concrt\RealizedChore.h concrt\ResourceManager.cpp concrt\ResourceManager.h concrt\rminternal.h concrt\rtlocks.cpp concrt\ScheduleGroupBase.cpp concrt\ScheduleGroupBase.h concrt\SchedulerBase.cpp concrt\SchedulerBase.h concrt\SchedulerPolicyBase.cpp concrt\SchedulerProxy.cpp concrt\SchedulerProxy.h concrt\SchedulingNode.cpp concrt\SchedulingNode.h concrt\SchedulingRing.cpp concrt\SchedulingRing.h concrt\SearchAlgorithms.cpp concrt\SearchAlgorithms.h concrt\staticinits.cpp concrt\StructuredWorkStealingQueue.h concrt\SubAllocator.cpp concrt\SubAllocator.h concrt\targetver.h concrt\TaskCollection.cpp concrt\TaskCollection.h concrt\TaskCollectionBase.cpp concrt\ThreadInternalContext.cpp concrt\ThreadInternalContext.h concrt\ThreadProxy.cpp concrt\ThreadProxy.h concrt\ThreadProxyFactory.h concrt\ThreadProxyFactoryManager.cpp concrt\ThreadScheduler.cpp concrt\ThreadScheduler.h concrt\ThreadVirtualProcessor.cpp concrt\ThreadVirtualProcessor.h concrt\Timer.cpp concrt\Timer.h concrt\Trace.cpp concrt\Trace.h concrt\Transmogrificator.cpp concrt\Transmogrificator.h concrt\TransmogrifiedPrimary.cpp concrt\TransmogrifiedPrimary.h concrt\UMSBackgroundPoller.cpp concrt\UMSBackgroundPoller.h concrt\UMSFreeThreadProxy.cpp concrt\UMSFreeThreadProxy.h concrt\UMSFreeVirtualProcessorRoot.cpp concrt\UMSFreeVirtualProcessorRoot.h concrt\UMSSchedulerProxy.cpp concrt\UMSSchedulerProxy.h concrt\UMSSchedulingContext.cpp concrt\UMSSchedulingContext.h concrt\UMSThreadInternalContext.cpp concrt\UMSThreadInternalContext.h concrt\UMSThreadProxy.cpp concrt\UMSThreadProxy.h concrt\UMSThreadScheduler.cpp concrt\UMSThreadScheduler.h concrt\UMSThreadVirtualProcessor.cpp concrt\UMSThreadVirtualProcessor.h concrt\UMSWrapper.cpp concrt\UMSWrapper.h concrt\utils.cpp concrt\utils.h concrt\VirtualProcessor.cpp concrt\VirtualProcessor.h concrt\VirtualProcessorRoot.cpp concrt\VirtualProcessorRoot.h concrt\WinRTWrapper.cpp concrt\WinRTWrapper.h concrt\WorkQueue.cpp concrt\workqueue.h concrt\WorkStealingQueue.h i386\trnsctrl.cpp linkopts\binmode.cpp linkopts\commode.cpp linkopts\fp10.cpp linkopts\invalidcontinue.cpp linkopts\iso_stdio_wide_specifiers.cpp linkopts\legacy_conio_definitions.cpp linkopts\legacy_stdio_definitions.cpp linkopts\legacy_stdio_msvcrt_compatibility.cpp linkopts\legacy_stdio_wide_specifiers.cpp linkopts\loosefpmath.cpp linkopts\newmode.cpp linkopts\noarg.cpp linkopts\noenv.cpp linkopts\nothrownew.cpp linkopts\setargv.cpp linkopts\threadlocale.cpp linkopts\wsetargv.cpp stl\cerr.cpp stl\cin.cpp stl\clog.cpp stl\cout.cpp stl\dllmain.cpp stl\excptptr.cpp stl\filesys.cpp stl\filesys.h stl\fiopen.cpp stl\future.cpp stl\generics.h stl\instances.cpp stl\iomanip.cpp stl\ios.cpp stl\iosptrs.cpp stl\iostream.cpp stl\locale.cpp stl\locale0.cpp stl\locale0_implib.cpp stl\locale_implib_pure.cpp stl\mpiostream.cpp stl\multprec.cpp stl\nothrow.cpp stl\ppltasks.cpp stl\primitives.h stl\raisehan.cpp stl\stdhndlr.cpp stl\stdthrow.cpp stl\syserror.cpp stl\taskscheduler.cpp stl\thread0.cpp stl\uncaught.cpp stl\ushcerr.cpp stl\ushcin.cpp stl\ushclog.cpp stl\ushcout.cpp stl\ushiostr.cpp stl\wcerr.cpp stl\wcin.cpp stl\wclog.cpp stl\wcout.cpp stl\winapinls.cpp stl\wiostrea.cpp stl\wlocale.cpp stl\wrapwin.h stl\xalloc.cpp stl\xdateord.cpp stl\xlgamma.cpp stl\xlocale.cpp stl\xlock.cpp stl\xmath.h stl\xmtx.h stl\xonce.cpp stl\xrngabort.cpp stl\xrngdev.cpp stl\xthrow.cpp stl\xxcctype.h stl\xxdftype.h stl\xxfftype.h stl\xxlftype.h stl\xxstod.h stl\xxwctype.h stl\xxxdtent.h stl\xxxprec.h vccorlib\activation.cpp vccorlib\agile.cpp vccorlib\attribute.cpp vccorlib\basetypes.cpp vccorlib\box.cpp vccorlib\climain.cpp vccorlib\compiler.cpp vccorlib\console.cpp vccorlib\delegate.cpp vccorlib\dllexports.cpp vccorlib\dllexportsimpl.cpp vccorlib\eventsource.cpp vccorlib\exceptions.cpp vccorlib\heap.cpp vccorlib\init.cpp vccorlib\main.cpp vccorlib\object.cpp vccorlib\outofprocmodule.cpp vccorlib\serverexports.cpp vccorlib\sizet.cpp vccorlib\string.cpp vccorlib\tmmta.cpp vccorlib\tmsta.cpp vccorlib\type.cpp vccorlib\vccorlib.cpp vccorlib\vcwinrt.cpp vccorlib\weakreference.cpp vccorlib\winmain.cpp vcruntime\app_appinit.cpp vcruntime\argv_mode.cpp vcruntime\commit_mode.cpp vcruntime\default_precision.cpp vcruntime\delete_array.cpp vcruntime\delete_array_nothrow.cpp vcruntime\delete_array_size.cpp vcruntime\delete_debug.cpp vcruntime\delete_scalar.cpp vcruntime\delete_scalar_nothrow.cpp vcruntime\delete_scalar_size.cpp vcruntime\denormal_control.cpp vcruntime\dll_dllmain.cpp vcruntime\dll_dllmain_stub.cpp vcruntime\ehvccctr.cpp vcruntime\ehvcccvb.cpp vcruntime\ehvecctr.cpp vcruntime\ehveccvb.cpp vcruntime\ehvecdtr.cpp vcruntime\exe_main.cpp vcruntime\exe_winmain.cpp vcruntime\exe_wmain.cpp vcruntime\exe_wwinmain.cpp vcruntime\file_mode.cpp vcruntime\fltused.cpp vcruntime\frame.cpp vcruntime\initialization.cpp vcruntime\initializers.cpp vcruntime\internal_shared.h vcruntime\invalid_parameter_handler.cpp vcruntime\iso_stdio_wide_specifiers_pure.cpp vcruntime\lconv_unsigned_char.cpp vcruntime\legacy_stdio_msvcrt_compatibility_pure.cpp vcruntime\legacy_stdio_wide_specifiers_pure.cpp vcruntime\locale0_implib.cpp vcruntime\locks.cpp vcruntime\managdeh.cpp vcruntime\ManagedMain.cpp vcruntime\matherr.cpp vcruntime\mbsearch.cpp vcruntime\mcrtexe.cpp vcruntime\mcrtexew.cpp vcruntime\mehvccctr.cpp vcruntime\mehvcccvb.cpp vcruntime\mehvecctr.cpp vcruntime\mehveccvb.cpp vcruntime\mehvecdtr.cpp vcruntime\mlfind.cpp vcruntime\mlsearch.cpp vcruntime\mqsort.cpp vcruntime\msilexit.cpp vcruntime\mstartup.cpp vcruntime\mwcrtexe.cpp vcruntime\mwcrtexew.cpp vcruntime\new_array.cpp vcruntime\new_array_nothrow.cpp vcruntime\new_debug.cpp vcruntime\new_mode.cpp vcruntime\new_scalar.cpp vcruntime\new_scalar_nothrow.cpp vcruntime\per_thread_data.cpp vcruntime\ptrust.cpp vcruntime\pureMSILcode.cpp vcruntime\purevirt.cpp vcruntime\purevirt_data.cpp vcruntime\rtti.cpp vcruntime\std_exception.cpp vcruntime\std_nothrow.cpp vcruntime\std_type_info.cpp vcruntime\std_type_info_static.cpp vcruntime\thread_locale.cpp vcruntime\throw.cpp vcruntime\throw_bad_alloc.cpp vcruntime\tlsdtor.cpp vcruntime\tlsdyn.cpp vcruntime\tlssup.cpp vcruntime\tncleanup.cpp vcruntime\ucrt_stubs.cpp vcruntime\undname.cxx vcruntime\unexpected.cpp vcruntime\user.cpp vcruntime\utility.cpp vcruntime\utility_app.cpp vcruntime\utility_desktop.cpp vcruntime\validate.cpp vcruntime\vcruntime_dllmain.cpp vcruntime\vcruntime_internal.h vcruntime\vcruntime_stubs.cpp vcruntime\vcstartup_internal.h vcruntime\winapi_downlevel.cpp vcruntime\winapi_thunks.cpp ----------------------------------------------