aboutsummaryrefslogtreecommitdiff
path: root/src/lib/Deque.rs
diff options
context:
space:
mode:
authorMarijn Haverbeke <[email protected]>2011-05-12 17:24:54 +0200
committerMarijn Haverbeke <[email protected]>2011-05-12 21:30:44 +0200
commit3816e57fd2a8ab19e4ac6d4b3ddd5b49d5973ff2 (patch)
tree508982ed2f789aedd89eebd529343d9dc88b8e01 /src/lib/Deque.rs
parentTransitional change to make extfmt output lowercase module name (diff)
downloadrust-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.rs145
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: