This is a proposal.  Steps here:

On Fri, Sep 27, 2019 at 10:02 PM Vladimir Grigoriev via Std-Discussion <> wrote:
Similar to the usual arithmetic conversions the operators of the standard class std::bitset should be templated.with different sizes

For example

template<size_t N1, size_t N2>
bitset<std::max( N1, N2 )> operator &( const bitset<N1> &, const bitset<N2> & ) noexcept;


template <size_t M>
bitset<N> & operator &=( const bitset<M> & rhs) noexcept;

With best regards,
Vlad from Moscow

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