filesystem snapshot, C++ (vc++)

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#include <string>
#include <iostream>
#include <map>
#include <vector>

// #include <boost/filesystem.hpp>
// namespace fs = boost::filesystem;
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;

using dir_map = std::map< std::string, std::vector<std::string> > ;

void add( const fs::path& path, dir_map& map, bool recursive = true )
{
    if( fs::exists(path) )
    {
        const std::string dir_str = path.string() ;
        fs::directory_iterator end ;
        for( fs::directory_iterator iter(path) ; iter != end ; ++iter )
        {
            const auto& item_path = iter->path() ;
            map[dir_str].push_back( item_path.string() ) ;
            if( recursive && fs::is_directory(item_path) ) 
            {
                map[dir_str].back() += " (directory)" ;
                add( item_path, map, true ) ;
            }
        }
    }
}

int main()
{
     dir_map map ;
     add( "C:/sandbox", map ) ;
     for( const auto& pair : map )
     {
         std::cout << pair.first << '\n' ;
         for( const auto& str : pair.second ) std::cout << "    " << str << '\n' ;
         std::cout << '\n' ;
     }
}

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Compilation time: 2,2 sec, absolute running time: 0,33 sec, absolute service time: 2,55 sec