std::experimental::ranges::IndirectStrictWeakOrder

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Filesystem library (filesystem TS)
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template < class F, class I1, class I2 = I1 >

concept bool IndirectStrictWeakOrder =
    Readable<I1> && Readable<I2> &&
    CopyConstructible<F> &&
    StrictWeakOrder<F&, ranges:: value_type_t <I1> &, ranges:: value_type_t <I2> & > &&
    StrictWeakOrder<F&, ranges:: value_type_t <I1> &, ranges:: reference_t <I2>> &&
    StrictWeakOrder<F&, ranges:: reference_t <I1>, ranges:: value_type_t <I2> & > &&
    StrictWeakOrder<F&, ranges:: reference_t <I1>, ranges:: reference_t <I2>> &&
    StrictWeakOrder<F&, ranges:: iter_common_reference_t <I1>,

                        ranges:: iter_common_reference_t <I2>> ;
(ranges TS)