std::indirectly_writable - Man Page

#include <iterator>

template<typename _Out, typename _Tp>
concept std::indirectly_writable =  requires(_Out&& __o, _Tp&& __t)
      {
        *__o = std::forward<_Tp>(__t);
        *std::forward<_Out>(__o) = std::forward<_Tp>(__t);
        const_cast<const iter_reference_t<_Out>&&>(*__o)
          = std::forward<_Tp>(__t);
        const_cast<const iter_reference_t<_Out>&&>(*std::forward<_Out>(__o))
          = std::forward<_Tp>(__t);
      }

Requirements for writing a value into an iterator's referenced object.

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