For clean C++, I like leveldb (a key-value DB library) and re2 (a regex engine). Random files from each of them: https://github.com/google/leveldb/blob/master

For clean C++, I like leveldb (a key-value DB library) and re2 (a regex engine). Random files from each of them: https://github.com/google/leveldb/blob/master/table/table_builder.cc https://github.com/google/leveldb/blob/master/table/table_bu... https://github.com/google/re2/blob/master/re2/nfa.cc https://github.com/google/re2/blob/master/re2/nfa.cc