std::experimental::ranges::IndirectlySwappable

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template < class I1, class I2 = I1 >

concept bool IndirectlySwappable =
    Readable<I1> && Readable<I2> &&
    requires(I1&& i1, I2&& i2) {
ranges::iter_swap ( std::forward <I1> (i1), std::forward <I2> (i2) ) ;
ranges::iter_swap ( std::forward <I2> (i2), std::forward <I1> (i1) ) ;
ranges::iter_swap ( std::forward <I1> (i1), std::forward <I1> (i1) ) ;
ranges::iter_swap ( std::forward <I2> (i2), std::forward <I2> (i2) ) ;

} ;
(ranges TS)