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C++ standard draft n3242 in 23.2, in table containing container requirements, states that X::reference for container containing T must be lvalue T. Yet, for vector<bool>, vector<bool>::reference is another class, a proxy for accessing individual bits of bytes stored in vector.
Does that mean that std::vector class template specification for T = bool, defined in standard, fails to fulfill container requirements?
Yes.
Similarly, its iterators are not truly random access iterators, because
operator*yields a proxy object.vector<bool>is a mess.