Feedback on practical use of C++17 std::recursive_directory_iterator
summary
Implements API patches on gcc and clang that add a lambda filter and a regex filter to std::recursive_directory_iterator, runs filesystem benchmarks over Gecko. Lambda version is consistently faster — about 55% on Unix and 10% on Windows — and is easy to implement. Regex is 25% faster on Unix but about 46% slower on Windows due to MSVC internals, introduces a filesystem↔regex dependency and cannot push the filter down to the Windows syscall.
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