Add helper method for taking the k smallest elements in an iterator#473

Merged

bors[bot] merged 13 commits intorust-itertools:masterfrom

nicoonoclaste:k_smollest

Dec 14, 2020

Commits on Oct 2, 2020

Add Itertool::k_smallest method, in std context
nicoonoclaste
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k_smollest: Add debug_assert for invariant
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Add property-based test for k_smallest when applied to ranges
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tests::k_smallest_range: Shuffle the input before taking the k smallest
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k_smallest: Clarify what happens when self.len() < k
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k_smallest: Document the equivalence with self.sorted().take(k)
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tests::test_std: Support generating random iterators with quickcheck
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Add generic test comparing k_smallest(k) and sorted().take(k)
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k_smallest: Comment what we do with peek_mut()
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test_std::k_smallest: Avoid allocating too much memory
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k_smallest: Work around suboptimality in `peek_mut`

SkiFire13
and
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test_std: Add generic_test! to instanciate tests w/ multiple types
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Make k_smallest work with just `alloc`
nicoonoclaste
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