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Remove an element from the front of the container by reference.
pop_front(x)
Invisibly returns NULL.
NULL
A CppDeque, CppForwardList, or CppList object.
emplace_front, front, pop, pop_back, push_front.
d <- cpp_deque(4:6) d # 4 5 6 pop_front(d) d # 5 6
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