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#include <iostream>
#include <filesystem>
#include <vector>
using namespace std;
using namespace filesystem;
//code
void breadth(path const &dir) // starting dir.
{
vector<path> level{ dir }; // currently processed level
while (not level.empty()) // process all its dirs.
{
vector<path> next; // dirs of the next level
for (auto const &dir: level) // visit all dirs at this level
{
cout << "At " << dir << '\n';
// at each dir: visit all entries
for (auto const &entry: directory_iterator{ dir })
{
if (entry.is_directory()) // store all dirs at the current
next.push_back(entry); // level
else // or process its non-dir entry
cout << " entry: " << entry << '\n';
}
}
level = next; // continue at the next level,
} // which eventually won't exist
}
//=
int main()
{
breadth("/home/frank/tmp");
}
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