stop recursion for recursive_directory_operator c++ - c++

Question

So let's say i have this code that looks for documents of mine and prints the path to them.
#include <iostream>
#include <experimental/filesystem>
#include <string>
#include <stdio.h>
#include <Shlwapi.h>
using namespace std;
string extensions[3] = { ".doc", ".docx", ".txt" }; // things to look for
string ignoredirs[2] = { "Windows", "Program Files", } // and other ones that i was too
// lazy to write in there
using namespace std::experimental::filesystem;
path yee;
void main()
{
for (recursive_directory_iterator i("c:\\"), end; i != end; ++i)
if (!is_directory(i->path()) && i->path().has_extension()) // checks if the file
// even has an extension
{
for (int x = 0; x <= 3; ++x)
if (i->path().extension().string() == extensions[x])// checks if the
// extension is equal
// to current
// extension in loop
cout << "found document at :" ;
cout << i->path().string() << endl; // print out the path
}
}
And I would like to not iterate to directories in ignoredir[] because it takes ages to find my docs on the filesystem.
I saw this code from cppreference.com.
Could someone explain me the the code and/or how to use it in my use case?
Pr could you submit a better solution than that?
Ps. I don't want to use boost in this program, just to see how it works in experimental::filesystem

Answer 1

Proposed solution:
#include <iostream>
#include <experimental/filesystem>
#include <string>
#include <stdio.h>
#include <Shlwapi.h>
#include <set>
using namespace std;
set<string> extensions = { ".doc", ".docx", ".txt" }; //things to look for
set<string> ignoredirs = { "Windows", "Program Files" }; //and other ones that i was too lazy to write in there
using namespace std::experimental::filesystem;
int main()
{
for (recursive_directory_iterator i("c:\\"), end; i != end; ++i)
{
if (!is_directory(i->path()) && i->path().has_extension()) // checks ifthe file even has an extension
{
if (extensions.find(i->path().extension().string()) != extensions.end())
cout << "found document at :";
cout << i->path().string() << endl; //print out the path
}
if (ignoredirs.find(i->path().filename().string()) != ignoredirs.end())
i.disable_recursion_pending();
}
}
Explanation:
i->path().filename() actually return directory name, when the same directory name is in set<> then i.disable_recursion_pending(); is called. When this one is called recursive_directory_iterator i omit directory with i->path().filename() name.
set<string> was used to get rid internal for loop that requires size of table, which is error prone. Also performance gain and code simplification
Notice:
On windows directory names should be compared case insensitive. Also Windows 64bit have "Program Files" and "Program Files (x86)" and both need to be listed in ignore list (or string comparison need to be improved)