diff options
| author | Marijn Haverbeke <[email protected]> | 2011-05-12 17:24:54 +0200 |
|---|---|---|
| committer | Marijn Haverbeke <[email protected]> | 2011-05-12 21:30:44 +0200 |
| commit | 3816e57fd2a8ab19e4ac6d4b3ddd5b49d5973ff2 (patch) | |
| tree | 508982ed2f789aedd89eebd529343d9dc88b8e01 /src/lib/Deque.rs | |
| parent | Transitional change to make extfmt output lowercase module name (diff) | |
| download | rust-3816e57fd2a8ab19e4ac6d4b3ddd5b49d5973ff2.tar.xz rust-3816e57fd2a8ab19e4ac6d4b3ddd5b49d5973ff2.zip | |
Downcase std modules again, move to :: for module dereferencing
This should be a snapshot transition.
Diffstat (limited to 'src/lib/Deque.rs')
| -rw-r--r-- | src/lib/Deque.rs | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/src/lib/Deque.rs b/src/lib/Deque.rs deleted file mode 100644 index a38e4fec..00000000 --- a/src/lib/Deque.rs +++ /dev/null @@ -1,145 +0,0 @@ -/** - * A deque, for fun. Untested as of yet. Likely buggy. - */ - -type t[T] = obj { - fn size() -> uint; - - fn add_front(&T t); - fn add_back(&T t); - - fn pop_front() -> T; - fn pop_back() -> T; - - fn peek_front() -> T; - fn peek_back() -> T; - - fn get(int i) -> T; -}; - -fn create[T]() -> t[T] { - - type cell[T] = Option.t[T]; - - let uint initial_capacity = 32u; // 2^5 - - /** - * Grow is only called on full elts, so nelts is also len(elts), unlike - * elsewhere. - */ - fn grow[T](uint nelts, uint lo, vec[cell[T]] elts) -> vec[cell[T]] { - assert (nelts == Vec.len[cell[T]](elts)); - - fn fill[T](uint i, uint nelts, uint lo, - vec[cell[T]] old) -> cell[T] { - if (i < nelts) { - ret old.((lo + i) % nelts); - } else { - ret Option.none[T]; - } - } - - let uint nalloc = UInt.next_power_of_two(nelts + 1u); - let Vec.init_op[cell[T]] copy_op = bind fill[T](_, nelts, lo, elts); - ret Vec.init_fn[cell[T]](copy_op, nalloc); - } - - fn get[T](vec[cell[T]] elts, uint i) -> T { - alt (elts.(i)) { - case (Option.some[T](?t)) { ret t; } - case (_) { fail; } - } - fail; // FIXME: remove me when exhaustiveness checking works - } - - obj deque[T](mutable uint nelts, - mutable uint lo, - mutable uint hi, - mutable vec[cell[T]] elts) - { - fn size() -> uint { ret nelts; } - - fn add_front(&T t) { - let uint oldlo = lo; - - if (lo == 0u) { - lo = Vec.len[cell[T]](elts) - 1u; - } else { - lo -= 1u; - } - - if (lo == hi) { - elts = grow[T](nelts, oldlo, elts); - lo = Vec.len[cell[T]](elts) - 1u; - hi = nelts; - } - - elts.(lo) = Option.some[T](t); - nelts += 1u; - } - - fn add_back(&T t) { - if (lo == hi && nelts != 0u) { - elts = grow[T](nelts, lo, elts); - lo = 0u; - hi = nelts; - } - - elts.(hi) = Option.some[T](t); - hi = (hi + 1u) % Vec.len[cell[T]](elts); - nelts += 1u; - } - - /** - * We actually release (turn to none()) the T we're popping so - * that we don't keep anyone's refcount up unexpectedly. - */ - fn pop_front() -> T { - let T t = get[T](elts, lo); - elts.(lo) = Option.none[T]; - lo = (lo + 1u) % Vec.len[cell[T]](elts); - nelts -= 1u; - ret t; - } - - fn pop_back() -> T { - if (hi == 0u) { - hi = Vec.len[cell[T]](elts) - 1u; - } else { - hi -= 1u; - } - - let T t = get[T](elts, hi); - elts.(hi) = Option.none[T]; - nelts -= 1u; - ret t; - } - - fn peek_front() -> T { - ret get[T](elts, lo); - } - - fn peek_back() -> T { - ret get[T](elts, hi - 1u); - } - - fn get(int i) -> T { - let uint idx = (lo + (i as uint)) % Vec.len[cell[T]](elts); - ret get[T](elts, idx); - } - - } - let vec[cell[T]] v = Vec.init_elt[cell[T]](Option.none[T], - initial_capacity); - - ret deque[T](0u, 0u, 0u, v); -} - -// Local Variables: -// mode: rust; -// fill-column: 78; -// indent-tabs-mode: nil -// c-basic-offset: 4 -// buffer-file-coding-system: utf-8-unix -// compile-command: "make -k -C .. 2>&1 | sed -e 's/\\/x\\//x:\\//g'"; -// End: |