518dc52f85
This changes the indexing syntax from .() to [], the vector syntax from ~[] to [] and the extension syntax from #fmt() to #fmt[]
44 lines
1.2 KiB
Rust
44 lines
1.2 KiB
Rust
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/// A simple map based on a vector for small integer keys. Space requirements
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/// are O(highest integer key).
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import option::none;
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import option::some;
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// FIXME: Should not be @; there's a bug somewhere in rustc that requires this
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// to be.
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type smallintmap<T> = @{mutable v: [mutable option::t<T>]};
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fn mk<@T>() -> smallintmap<T> {
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let v: [mutable option::t<T>] = [mutable];
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ret @{mutable v: v};
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}
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fn insert<@T>(m: &smallintmap<T>, key: uint, val: &T) {
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vec::grow_set::<option::t<T>>(m.v, key, none::<T>, some::<T>(val));
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}
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fn find<@T>(m: &smallintmap<T>, key: uint) -> option::t<T> {
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if key < vec::len::<option::t<T>>(m.v) { ret m.v[key]; }
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ret none::<T>;
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}
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fn get<@T>(m: &smallintmap<T>, key: uint) -> T {
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alt find::<T>(m, key) {
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none::<T>. { log_err "smallintmap::get(): key not present"; fail; }
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some::<T>(v) { ret v; }
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}
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}
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fn contains_key<@T>(m: &smallintmap<T>, key: uint) -> bool {
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ret !option::is_none(find::<T>(m, key));
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}
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fn truncate<@T>(m: &smallintmap<T>, len: uint) {
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m.v = vec::slice_mut::<option::t<T>>(m.v, 0u, len);
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}
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fn max_key<T>(m: &smallintmap<T>) -> uint {
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ret vec::len::<option::t<T>>(m.v);
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}
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