To skip certain files or directories during iteration, you can use conditional statements within your loop. By checking the properties of each entry, you can decide whether to process it or skip it.
Here’s an example where we skip files with a specific extension and directories with a specific name:
#include <filesystem>
#include <iostream>
namespace fs = std::filesystem;
int main() {
fs::directory_iterator start{R"(c:\test)"};
fs::directory_iterator end{};
for (auto iter{start}; iter != end; ++iter) {
if (iter->is_directory() &&
iter->path().filename() == "skip_this_dir") {
continue; // Skip this directory
}
if (iter->is_regular_file() &&
iter->path().extension() == ".skip") {
continue; // Skip files with .skip extension
}
std::cout << iter->path().string() << '\n';
}
}c:\test\file1.txt
c:\test\file2.txt
c:\test\another_directorySteps to Skip Entries:
- Check Directory Properties: Use
is_directory()to check if the entry is a directory andpath().filename()to get its name. - Check File Properties: Use
is_regular_file()to check if the entry is a file andpath().extension()to get its extension. - Skip Logic: Use
continueto skip the current iteration if the conditions are met.
More Complex Filtering:
For more complex conditions, consider using a predicate function:
#include <filesystem>
#include <iostream>
namespace fs = std::filesystem;
bool should_skip(const fs::directory_entry& entry) {
if (entry.is_directory() &&
entry.path().filename() == "skip_this_dir") {
return true;
}
if (entry.is_regular_file() &&
entry.path().extension() == ".skip") {
return true;
}
return false;
}
int main() {
fs::directory_iterator start{R"(c:\test)"};
fs::directory_iterator end{};
for (auto iter{start}; iter != end; ++iter) {
if (should_skip(*iter)) {
continue;
}
std::cout << iter->path().string() << '\n';
}
}c:\test\file1.txt
c:\test\file2.txt
c:\test\another_directoryThis approach allows you to encapsulate the skip logic in a separate function, making your main loop cleaner and easier to read. Skipping certain files or directories during iteration is a common requirement and can be handled efficiently with these techniques.
Answers to questions are automatically generated and may not have been reviewed.
Directory Iterators
An introduction to iterating through the file system, using directory iterators and recursive directory iterators
