std::indirectly_swappable - [alg.req.ind.swap], concept indirectly_swappable

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                                                    libstdc++                    std::indirectly_swappable(3cxx)

       template<typename _I1, typename _I2 _I1>
       concept std::indirectly_swappable =  indirectly_readable<_I1> && indirectly_readable<_I2>
             && requires(const _I1 __i1, const _I2 __i2)
             {
               ranges::iter_swap(__i1, __i1);
               ranges::iter_swap(__i2, __i2);
               ranges::iter_swap(__i1, __i2);
               ranges::iter_swap(__i2, __i1);
             }

       [alg.req.ind.swap], concept indirectly_swappable

       std::indirectly_swappable - [alg.req.ind.swap], concept indirectly_swappable

       #include <iterator>