Add pow2 resize vector#553
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gebner
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Feb 9, 2026
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| /// Resize the vector to new_size elements. | ||
| /// Preserves the first min(old_size, new_size) elements. | ||
| fn resize (#t:Type0) (v:vector t) (new_size:SZ.t{SZ.v new_size > 0}) |
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| fn resize (#t:Type0) (v:vector t) (new_size:SZ.t{SZ.v new_size > 0}) | |
| fn resize (#t:Type0) (v:vector t) (new_size:SZ.t) |
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Replace 3 inner boxes (arr_box, size_box, cap_box) with one outer box wrapping a plain struct: vector t = box (vector_internal t). - 1 heap allocation per vector instead of 3 - Simpler predicate: pts_to v vi ** A.pts_to vi.arr buf - Cleaner mutation: write whole struct via v := new_vi - Better C extraction (single pointer to struct) - .fsti unchanged (vector and is_vector are abstract) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
push_back: cap unchanged when room exists, doubled when full. pop_back: cap halved when size == cap/2 > 0, unchanged otherwise. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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A vector that doubles in length when appending more than N elements (N length), and halves in length when element count falls below N/2. Basically the C++ STL vector.