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Showing content from https://cplusplus.com/reference/vector/vector-bool/hash/ below:

class template specialization

<vector>

template <class T> struct hash;                             // unspecializedtemplate <class Alloc> struct hash <vector<bool,Alloc>>;    // vector<bool>

Hash for vector<bool>

The functional call returns a hash value based on the entire vector: A hash value is a value that depends solely on its argument, returning always the same value for the same argument (for a given program execution). The value returned shall have a small likelihood of being the same as the one returned for a different argument (with chances of collision approaching 1/numeric_limits<size_t>::max).

This allows the use of vector<bool> objects as keys for unordered containers (like unordered_set or unordered_map).

See hash for additional information.

operator()

Returns a hash value for its argument, as a value of type size_t.
size_t is an unsigned integral type.

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