Why vector::reference doesn’t return reference to bool?

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Vector is specialized for bool.

It is considered a mistake of the std. Use vector<char> instead:

template<typename t>
struct foo {
  using type = t;
};
template<>
struct foo<bool> {
  using type = char;
};

template<typename t, typename... p>
using fixed_vector = std::vector<typename foo<t>::type, p...>;

Occasionally you may need references to a bool contained inside the vector. Unfortunately, using vector<char> can only give you references to chars. If you really need bool&, check out the Boost Containers library. It has an unspecialized version of vector<bool>.

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