89 lines
2.1 KiB
Rust
89 lines
2.1 KiB
Rust
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use core;
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#[deriving(Eq, IterBytes)]
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pub struct EnumSet<E> {
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bits: uint
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}
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pub trait CLike {
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pub fn to_uint(&self) -> uint;
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pub fn from_uint(uint) -> Self;
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}
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fn bit<E:CLike>(e: E) -> uint {
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1 << e.to_uint()
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}
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pub impl<E:CLike> EnumSet<E> {
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fn empty() -> EnumSet<E> {
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EnumSet {bits: 0}
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}
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fn is_empty(&self) -> bool {
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self.bits == 0
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}
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fn intersects(&self, e: EnumSet<E>) -> bool {
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(self.bits & e.bits) != 0
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}
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fn contains(&self, e: EnumSet<E>) -> bool {
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(self.bits & e.bits) == e.bits
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}
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fn add(&mut self, e: E) {
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self.bits |= bit(e);
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}
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fn plus(&self, e: E) -> EnumSet<E> {
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EnumSet {bits: self.bits | bit(e)}
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}
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fn contains_elem(&self, e: E) -> bool {
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(self.bits & bit(e)) != 0
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}
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fn each(&self, f: &fn(E) -> bool) {
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let mut bits = self.bits;
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let mut index = 0;
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while bits != 0 {
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if (bits & 1) != 0 {
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let e = CLike::from_uint(index);
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if !f(e) {
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return;
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}
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}
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index += 1;
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bits >>= 1;
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}
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}
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}
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impl<E:CLike> core::Sub<EnumSet<E>, EnumSet<E>> for EnumSet<E> {
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fn sub(&self, e: &EnumSet<E>) -> EnumSet<E> {
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EnumSet {bits: self.bits & !e.bits}
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}
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}
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impl<E:CLike> core::BitOr<EnumSet<E>, EnumSet<E>> for EnumSet<E> {
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fn bitor(&self, e: &EnumSet<E>) -> EnumSet<E> {
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EnumSet {bits: self.bits | e.bits}
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}
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}
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impl<E:CLike> core::BitAnd<EnumSet<E>, EnumSet<E>> for EnumSet<E> {
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fn bitand(&self, e: &EnumSet<E>) -> EnumSet<E> {
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EnumSet {bits: self.bits & e.bits}
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}
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}
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