std::indirectly_swappable

#include <iterator>

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

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