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[alg.is.permutation]/6 #4554

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sim9108 opened this issue Mar 23, 2021 · 1 comment
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[alg.is.permutation]/6 #4554

sim9108 opened this issue Mar 23, 2021 · 1 comment

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@sim9108
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sim9108 commented Mar 23, 2021

ranges::equal(first1, last1, pfirst, plast, pred, proj1, proj2)
=>
ranges::equal(first1, last1, first2, last2, pred, proj1, proj2)
@jwakely
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jwakely commented Mar 23, 2021 •
edited

No, I don't think that would be correct. The point is that we're not requiring [first1,last1) and [first2,last2) to compare equal, we're requiring [first1,last1) and some permutation of [first2,last2) to compare equal. That permutation of [first2,last2) is what the range [pfirst,plast) denotes.

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@jwakely @sim9108 @jensmaurer