HelenOS sources

pop_front         155 uspace/lib/cpp/include/__bits/adt/queue.hpp                 c.pop_front();
pop_front         206 uspace/lib/cpp/src/__bits/test/deque.cpp         d1.pop_front();
pop_front         179 uspace/lib/cpp/src/__bits/test/list.cpp         l1.pop_front();