std::common_reference_with - Man Page

#include <concepts>

template<typename _Tp, typename _Up>
concept std::common_reference_with =  same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>>
      && convertible_to<_Tp, common_reference_t<_Tp, _Up>>
      && convertible_to<_Up, common_reference_t<_Tp, _Up>>

[concept.commonref], concept common_reference_with

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