cpp/utility/bitset/operator at

Accesses the bit at position. The first version returns the value of the bit, the second version returns an object of type std that allows modification of the value.

Unlike test, does not throw exceptions: the behavior is undefined if is out of bounds.

Return value
@1@ the value of the requested bit

@2@ an object of type std, which allows writing to the requested bit.

Exceptions
None