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23aec16e8b
`Core::Directory::for_each_entry()` takes a callback which is passed the
DirectoryEntry and the parent Directory. It returns any error from
creating the iterator, iterating the entries, or returned from the
callback.
As a simple example, this:
```c++
Core::DirIterator piece_set_iterator { "/res/icons/chess/sets/",
Core::DirIterator::SkipParentAndBaseDir };
while (piece_set_iterator.has_next())
m_piece_sets.append(piece_set_iterator.next_path());
```
becomes this:
```c++
TRY(Core::Directory::for_each_entry("/res/icons/chess/sets/"sv,
Core::DirIterator::SkipParentAndBaseDir,
[&](auto const& entry, auto&) -> ErrorOr<IterationDecision> {
TRY(m_piece_sets.try_append(entry.name));
return IterationDecision::Continue;
}));
```