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rust/src/libstd/bitv.rs
Brendan Zabarauskas e596128bd8 Remove 'Local Variable' comments
2013-05-02 13:22:04 +10:00

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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use core::vec::from_elem;
struct SmallBitv {
/// only the lowest nbits of this value are used. the rest is undefined.
bits: uint
}
/// a mask that has a 1 for each defined bit in a small_bitv, assuming n bits
#[inline(always)]
fn small_mask(nbits: uint) -> uint {
(1 << nbits) - 1
}
pub impl SmallBitv {
fn new(bits: uint) -> SmallBitv {
SmallBitv {bits: bits}
}
#[inline(always)]
fn bits_op(&mut self, right_bits: uint, nbits: uint,
f: &fn(uint, uint) -> uint) -> bool {
let mask = small_mask(nbits);
let old_b: uint = self.bits;
let new_b = f(old_b, right_bits);
self.bits = new_b;
mask & old_b != mask & new_b
}
#[inline(always)]
fn union(&mut self, s: &SmallBitv, nbits: uint) -> bool {
self.bits_op(s.bits, nbits, |u1, u2| u1 | u2)
}
#[inline(always)]
fn intersect(&mut self, s: &SmallBitv, nbits: uint) -> bool {
self.bits_op(s.bits, nbits, |u1, u2| u1 & u2)
}
#[inline(always)]
fn become(&mut self, s: &SmallBitv, nbits: uint) -> bool {
self.bits_op(s.bits, nbits, |_u1, u2| u2)
}
#[inline(always)]
fn difference(&mut self, s: &SmallBitv, nbits: uint) -> bool {
self.bits_op(s.bits, nbits, |u1, u2| u1 & !u2)
}
#[inline(always)]
fn get(&self, i: uint) -> bool {
(self.bits & (1 << i)) != 0
}
#[inline(always)]
fn set(&mut self, i: uint, x: bool) {
if x {
self.bits |= 1<<i;
}
else {
self.bits &= !(1<<i as uint);
}
}
#[inline(always)]
fn equals(&self, b: &SmallBitv, nbits: uint) -> bool {
let mask = small_mask(nbits);
mask & self.bits == mask & b.bits
}
#[inline(always)]
fn clear(&mut self) { self.bits = 0; }
#[inline(always)]
fn set_all(&mut self) { self.bits = !0; }
#[inline(always)]
fn is_true(&self, nbits: uint) -> bool {
small_mask(nbits) & !self.bits == 0
}
#[inline(always)]
fn is_false(&self, nbits: uint) -> bool {
small_mask(nbits) & self.bits == 0
}
#[inline(always)]
fn invert(&mut self) { self.bits = !self.bits; }
}
struct BigBitv {
storage: ~[uint]
}
/**
* a mask that has a 1 for each defined bit in the nth element of a big_bitv,
* assuming n bits.
*/
#[inline(always)]
fn big_mask(nbits: uint, elem: uint) -> uint {
let rmd = nbits % uint::bits;
let nelems = nbits/uint::bits + if rmd == 0 {0} else {1};
if elem < nelems - 1 || rmd == 0 {
!0
} else {
(1 << rmd) - 1
}
}
pub impl BigBitv {
fn new(storage: ~[uint]) -> BigBitv {
BigBitv {storage: storage}
}
#[inline(always)]
fn process(&mut self, b: &BigBitv, nbits: uint,
op: &fn(uint, uint) -> uint) -> bool {
let len = b.storage.len();
assert!((self.storage.len() == len));
let mut changed = false;
for uint::range(0, len) |i| {
let mask = big_mask(nbits, i);
let w0 = self.storage[i] & mask;
let w1 = b.storage[i] & mask;
let w = op(w0, w1) & mask;
if w0 != w {
changed = true;
self.storage[i] = w;
}
}
changed
}
#[inline(always)]
fn each_storage(&mut self, op: &fn(v: &mut uint) -> bool) {
for uint::range(0, self.storage.len()) |i| {
let mut w = self.storage[i];
let b = op(&mut w);
self.storage[i] = w;
if !b { break; }
}
}
#[inline(always)]
fn invert(&mut self) { for self.each_storage |w| { *w = !*w } }
#[inline(always)]
fn union(&mut self, b: &BigBitv, nbits: uint) -> bool {
self.process(b, nbits, |w1, w2| w1 | w2)
}
#[inline(always)]
fn intersect(&mut self, b: &BigBitv, nbits: uint) -> bool {
self.process(b, nbits, |w1, w2| w1 & w2)
}
#[inline(always)]
fn become(&mut self, b: &BigBitv, nbits: uint) -> bool {
self.process(b, nbits, |_, w| w)
}
#[inline(always)]
fn difference(&mut self, b: &BigBitv, nbits: uint) -> bool {
self.process(b, nbits, |w1, w2| w1 & !w2)
}
#[inline(always)]
fn get(&self, i: uint) -> bool {
let w = i / uint::bits;
let b = i % uint::bits;
let x = 1 & self.storage[w] >> b;
x == 1
}
#[inline(always)]
fn set(&mut self, i: uint, x: bool) {
let w = i / uint::bits;
let b = i % uint::bits;
let flag = 1 << b;
self.storage[w] = if x { self.storage[w] | flag }
else { self.storage[w] & !flag };
}
#[inline(always)]
fn equals(&self, b: &BigBitv, nbits: uint) -> bool {
let len = b.storage.len();
for uint::iterate(0, len) |i| {
let mask = big_mask(nbits, i);
if mask & self.storage[i] != mask & b.storage[i] {
return false;
}
}
}
}
enum BitvVariant { Big(~BigBitv), Small(~SmallBitv) }
enum Op {Union, Intersect, Assign, Difference}
// The bitvector type
pub struct Bitv {
rep: BitvVariant,
nbits: uint
}
priv impl Bitv {
fn die(&self) -> ! {
fail!(~"Tried to do operation on bit vectors with different sizes");
}
#[inline(always)]
fn do_op(&mut self, op: Op, other: &Bitv) -> bool {
if self.nbits != other.nbits {
self.die();
}
match self.rep {
Small(ref mut s) => match other.rep {
Small(ref s1) => match op {
Union => s.union(*s1, self.nbits),
Intersect => s.intersect(*s1, self.nbits),
Assign => s.become(*s1, self.nbits),
Difference => s.difference(*s1, self.nbits)
},
Big(_) => self.die()
},
Big(ref mut s) => match other.rep {
Small(_) => self.die(),
Big(ref s1) => match op {
Union => s.union(*s1, self.nbits),
Intersect => s.intersect(*s1, self.nbits),
Assign => s.become(*s1, self.nbits),
Difference => s.difference(*s1, self.nbits)
}
}
}
}
}
pub impl Bitv {
fn new(nbits: uint, init: bool) -> Bitv {
let rep = if nbits <= uint::bits {
Small(~SmallBitv::new(if init {!0} else {0}))
}
else {
let nelems = nbits/uint::bits +
if nbits % uint::bits == 0 {0} else {1};
let elem = if init {!0} else {0};
let s = from_elem(nelems, elem);
Big(~BigBitv::new(s))
};
Bitv {rep: rep, nbits: nbits}
}
/**
* Calculates the union of two bitvectors
*
* Sets `self` to the union of `self` and `v1`. Both bitvectors must be
* the same length. Returns 'true' if `self` changed.
*/
#[inline(always)]
fn union(&mut self, v1: &Bitv) -> bool { self.do_op(Union, v1) }
/**
* Calculates the intersection of two bitvectors
*
* Sets `self` to the intersection of `self` and `v1`. Both bitvectors
* must be the same length. Returns 'true' if `self` changed.
*/
#[inline(always)]
fn intersect(&mut self, v1: &Bitv) -> bool { self.do_op(Intersect, v1) }
/**
* Assigns the value of `v1` to `self`
*
* Both bitvectors must be the same length. Returns `true` if `self` was
* changed
*/
#[inline(always)]
fn assign(&mut self, v: &Bitv) -> bool { self.do_op(Assign, v) }
/// Retrieve the value at index `i`
#[inline(always)]
fn get(&self, i: uint) -> bool {
assert!((i < self.nbits));
match self.rep {
Big(ref b) => b.get(i),
Small(ref s) => s.get(i)
}
}
/**
* Set the value of a bit at a given index
*
* `i` must be less than the length of the bitvector.
*/
#[inline(always)]
fn set(&mut self, i: uint, x: bool) {
assert!((i < self.nbits));
match self.rep {
Big(ref mut b) => b.set(i, x),
Small(ref mut s) => s.set(i, x)
}
}
/**
* Compares two bitvectors
*
* Both bitvectors must be the same length. Returns `true` if both
* bitvectors contain identical elements.
*/
#[inline(always)]
fn equal(&self, v1: &Bitv) -> bool {
if self.nbits != v1.nbits { return false; }
match self.rep {
Small(ref b) => match v1.rep {
Small(ref b1) => b.equals(*b1, self.nbits),
_ => false
},
Big(ref s) => match v1.rep {
Big(ref s1) => s.equals(*s1, self.nbits),
Small(_) => return false
}
}
}
/// Set all bits to 0
#[inline(always)]
fn clear(&mut self) {
match self.rep {
Small(ref mut b) => b.clear(),
Big(ref mut s) => for s.each_storage() |w| { *w = 0u }
}
}
/// Set all bits to 1
#[inline(always)]
fn set_all(&mut self) {
match self.rep {
Small(ref mut b) => b.set_all(),
Big(ref mut s) => for s.each_storage() |w| { *w = !0u } }
}
/// Invert all bits
#[inline(always)]
fn invert(&mut self) {
match self.rep {
Small(ref mut b) => b.invert(),
Big(ref mut s) => for s.each_storage() |w| { *w = !*w } }
}
/**
* Calculate the difference between two bitvectors
*
* Sets each element of `v0` to the value of that element minus the
* element of `v1` at the same index. Both bitvectors must be the same
* length.
*
* Returns `true` if `v0` was changed.
*/
#[inline(always)]
fn difference(&mut self, v: &Bitv) -> bool { self.do_op(Difference, v) }
/// Returns true if all bits are 1
#[inline(always)]
fn is_true(&self) -> bool {
match self.rep {
Small(ref b) => b.is_true(self.nbits),
_ => {
for self.each() |i| { if !i { return false; } }
true
}
}
}
#[inline(always)]
fn each(&self, f: &fn(bool) -> bool) {
let mut i = 0;
while i < self.nbits {
if !f(self.get(i)) { break; }
i += 1;
}
}
/// Returns true if all bits are 0
fn is_false(&self) -> bool {
match self.rep {
Small(ref b) => b.is_false(self.nbits),
Big(_) => {
for self.each() |i| { if i { return false; } }
true
}
}
}
fn init_to_vec(&self, i: uint) -> uint {
return if self.get(i) { 1 } else { 0 };
}
/**
* Converts `self` to a vector of uint with the same length.
*
* Each uint in the resulting vector has either value 0u or 1u.
*/
fn to_vec(&self) -> ~[uint] {
vec::from_fn(self.nbits, |x| self.init_to_vec(x))
}
/**
* Organise the bits into bytes, such that the first bit in the
* bitv becomes the high-order bit of the first byte. If the
* size of the bitv is not a multiple of 8 then trailing bits
* will be filled-in with false/0
*/
fn to_bytes(&self) -> ~[u8] {
fn bit (bitv: &Bitv, byte: uint, bit: uint) -> u8 {
let offset = byte * 8 + bit;
if offset >= bitv.nbits {
0
} else {
bitv[offset] as u8 << (7 - bit)
}
}
let len = self.nbits/8 +
if self.nbits % 8 == 0 { 0 } else { 1 };
vec::from_fn(len, |i|
bit(self, i, 0) |
bit(self, i, 1) |
bit(self, i, 2) |
bit(self, i, 3) |
bit(self, i, 4) |
bit(self, i, 5) |
bit(self, i, 6) |
bit(self, i, 7)
)
}
/**
* Transform self into a [bool] by turning each bit into a bool
*/
fn to_bools(&self) -> ~[bool] {
vec::from_fn(self.nbits, |i| self[i])
}
/**
* Converts `self` to a string.
*
* The resulting string has the same length as `self`, and each
* character is either '0' or '1'.
*/
fn to_str(&self) -> ~str {
let mut rs = ~"";
for self.each() |i| { if i { rs += ~"1"; } else { rs += ~"0"; } };
rs
}
/**
* Compare a bitvector to a vector of uint
*
* The uint vector is expected to only contain the values 0u and 1u. Both
* the bitvector and vector must have the same length
*/
fn eq_vec(&self, v: ~[uint]) -> bool {
assert!(self.nbits == v.len());
let mut i = 0;
while i < self.nbits {
let w0 = self.get(i);
let w1 = v[i];
if !w0 && w1 != 0u || w0 && w1 == 0u { return false; }
i = i + 1;
}
true
}
fn ones(&self, f: &fn(uint) -> bool) {
for uint::range(0, self.nbits) |i| {
if self.get(i) {
if !f(i) { break }
}
}
}
}
impl Clone for Bitv {
/// Makes a copy of a bitvector
#[inline(always)]
fn clone(&self) -> Bitv {
match self.rep {
Small(ref b) => {
Bitv{nbits: self.nbits, rep: Small(~SmallBitv{bits: b.bits})}
}
Big(ref b) => {
let mut st = from_elem(self.nbits / uint::bits + 1, 0);
let len = st.len();
for uint::range(0, len) |i| { st[i] = b.storage[i]; };
Bitv{nbits: self.nbits, rep: Big(~BigBitv{storage: st})}
}
}
}
}
/**
* Transform a byte-vector into a bitv. Each byte becomes 8 bits,
* with the most significant bits of each byte coming first. Each
* bit becomes true if equal to 1 or false if equal to 0.
*/
pub fn from_bytes(bytes: &[u8]) -> Bitv {
from_fn(bytes.len() * 8, |i| {
let b = bytes[i / 8] as uint;
let offset = i % 8;
b >> (7 - offset) & 1 == 1
})
}
/**
* Transform a [bool] into a bitv by converting each bool into a bit.
*/
pub fn from_bools(bools: &[bool]) -> Bitv {
from_fn(bools.len(), |i| bools[i])
}
/**
* Create a bitv of the specified length where the value at each
* index is f(index).
*/
pub fn from_fn(len: uint, f: &fn(index: uint) -> bool) -> Bitv {
let mut bitv = Bitv::new(len, false);
for uint::range(0, len) |i| {
bitv.set(i, f(i));
}
bitv
}
impl ops::Index<uint,bool> for Bitv {
fn index(&self, i: &uint) -> bool {
self.get(*i)
}
}
#[inline(always)]
fn iterate_bits(base: uint, bits: uint, f: &fn(uint) -> bool) -> bool {
if bits == 0 {
return true;
}
for uint::range(0, uint::bits) |i| {
if bits & (1 << i) != 0 {
if !f(base + i) {
return false;
}
}
}
return true;
}
/// An implementation of a set using a bit vector as an underlying
/// representation for holding numerical elements.
///
/// It should also be noted that the amount of storage necessary for holding a
/// set of objects is proportional to the maximum of the objects when viewed
/// as a uint.
pub struct BitvSet {
priv size: uint,
// In theory this is a Bitv instead of always a BigBitv, but knowing that
// there's an array of storage makes our lives a whole lot easier when
// performing union/intersection/etc operations
priv bitv: BigBitv
}
pub impl BitvSet {
/// Creates a new bit vector set with initially no contents
fn new() -> BitvSet {
BitvSet{ size: 0, bitv: BigBitv::new(~[0]) }
}
/// Creates a new bit vector set from the given bit vector
fn from_bitv(bitv: Bitv) -> BitvSet {
let mut size = 0;
for bitv.ones |_| {
size += 1;
}
let Bitv{rep, _} = bitv;
match rep {
Big(~b) => BitvSet{ size: size, bitv: b },
Small(~SmallBitv{bits}) =>
BitvSet{ size: size, bitv: BigBitv{ storage: ~[bits] } },
}
}
/// Returns the capacity in bits for this bit vector. Inserting any
/// element less than this amount will not trigger a resizing.
fn capacity(&self) -> uint { self.bitv.storage.len() * uint::bits }
/// Consumes this set to return the underlying bit vector
fn unwrap(self) -> Bitv {
let cap = self.capacity();
let BitvSet{bitv, _} = self;
return Bitv{ nbits:cap, rep: Big(~bitv) };
}
#[inline(always)]
priv fn other_op(&mut self, other: &BitvSet, f: &fn(uint, uint) -> uint) {
fn nbits(mut w: uint) -> uint {
let mut bits = 0;
for uint::bits.times {
if w == 0 {
break;
}
bits += w & 1;
w >>= 1;
}
return bits;
}
if self.capacity() < other.capacity() {
self.bitv.storage.grow(other.capacity() / uint::bits, &0);
}
for other.bitv.storage.eachi |i, &w| {
let old = self.bitv.storage[i];
let new = f(old, w);
self.bitv.storage[i] = new;
self.size += nbits(new) - nbits(old);
}
}
/// Union in-place with the specified other bit vector
fn union_with(&mut self, other: &BitvSet) {
self.other_op(other, |w1, w2| w1 | w2);
}
/// Intersect in-place with the specified other bit vector
fn intersect_with(&mut self, other: &BitvSet) {
self.other_op(other, |w1, w2| w1 & w2);
}
/// Difference in-place with the specified other bit vector
fn difference_with(&mut self, other: &BitvSet) {
self.other_op(other, |w1, w2| w1 & !w2);
}
/// Symmetric difference in-place with the specified other bit vector
fn symmetric_difference_with(&mut self, other: &BitvSet) {
self.other_op(other, |w1, w2| w1 ^ w2);
}
}
impl BaseIter<uint> for BitvSet {
fn size_hint(&self) -> Option<uint> { Some(self.len()) }
fn each(&self, blk: &fn(v: &uint) -> bool) {
for self.bitv.storage.eachi |i, &w| {
if !iterate_bits(i * uint::bits, w, |b| blk(&b)) {
return;
}
}
}
}
impl cmp::Eq for BitvSet {
fn eq(&self, other: &BitvSet) -> bool {
if self.size != other.size {
return false;
}
for self.each_common(other) |_, w1, w2| {
if w1 != w2 {
return false;
}
}
for self.each_outlier(other) |_, _, w| {
if w != 0 {
return false;
}
}
return true;
}
fn ne(&self, other: &BitvSet) -> bool { !self.eq(other) }
}
impl Container for BitvSet {
fn len(&const self) -> uint { self.size }
fn is_empty(&const self) -> bool { self.size == 0 }
}
impl Mutable for BitvSet {
fn clear(&mut self) {
for self.bitv.each_storage |w| { *w = 0; }
self.size = 0;
}
}
impl Set<uint> for BitvSet {
fn contains(&self, value: &uint) -> bool {
*value < self.bitv.storage.len() * uint::bits && self.bitv.get(*value)
}
fn insert(&mut self, value: uint) -> bool {
if self.contains(&value) {
return false;
}
let nbits = self.capacity();
if value >= nbits {
let newsize = uint::max(value, nbits * 2) / uint::bits + 1;
assert!(newsize > self.bitv.storage.len());
self.bitv.storage.grow(newsize, &0);
}
self.size += 1;
self.bitv.set(value, true);
return true;
}
fn remove(&mut self, value: &uint) -> bool {
if !self.contains(value) {
return false;
}
self.size -= 1;
self.bitv.set(*value, false);
// Attempt to truncate our storage
let mut i = self.bitv.storage.len();
while i > 1 && self.bitv.storage[i - 1] == 0 {
i -= 1;
}
self.bitv.storage.truncate(i);
return true;
}
fn is_disjoint(&self, other: &BitvSet) -> bool {
for self.intersection(other) |_| {
return false;
}
return true;
}
fn is_subset(&self, other: &BitvSet) -> bool {
for self.each_common(other) |_, w1, w2| {
if w1 & w2 != w1 {
return false;
}
}
/* If anything is not ours, then everything is not ours so we're
definitely a subset in that case. Otherwise if there's any stray
ones that 'other' doesn't have, we're not a subset. */
for self.each_outlier(other) |mine, _, w| {
if !mine {
return true;
} else if w != 0 {
return false;
}
}
return true;
}
fn is_superset(&self, other: &BitvSet) -> bool {
other.is_subset(self)
}
fn difference(&self, other: &BitvSet, f: &fn(&uint) -> bool) {
for self.each_common(other) |i, w1, w2| {
if !iterate_bits(i, w1 & !w2, |b| f(&b)) {
return;
}
}
/* everything we have that they don't also shows up */
self.each_outlier(other, |mine, i, w|
!mine || iterate_bits(i, w, |b| f(&b))
);
}
fn symmetric_difference(&self, other: &BitvSet,
f: &fn(&uint) -> bool) {
for self.each_common(other) |i, w1, w2| {
if !iterate_bits(i, w1 ^ w2, |b| f(&b)) {
return;
}
}
self.each_outlier(other, |_, i, w|
iterate_bits(i, w, |b| f(&b))
);
}
fn intersection(&self, other: &BitvSet, f: &fn(&uint) -> bool) {
for self.each_common(other) |i, w1, w2| {
if !iterate_bits(i, w1 & w2, |b| f(&b)) {
return;
}
}
}
fn union(&self, other: &BitvSet, f: &fn(&uint) -> bool) {
for self.each_common(other) |i, w1, w2| {
if !iterate_bits(i, w1 | w2, |b| f(&b)) {
return;
}
}
self.each_outlier(other, |_, i, w|
iterate_bits(i, w, |b| f(&b))
);
}
}
priv impl BitvSet {
/// Visits each of the words that the two bit vectors (self and other)
/// both have in common. The three yielded arguments are (bit location,
/// w1, w2) where the bit location is the number of bits offset so far,
/// and w1/w2 are the words coming from the two vectors self, other.
fn each_common(&self, other: &BitvSet,
f: &fn(uint, uint, uint) -> bool) {
let min = uint::min(self.bitv.storage.len(),
other.bitv.storage.len());
for self.bitv.storage.slice(0, min).eachi |i, &w| {
if !f(i * uint::bits, w, other.bitv.storage[i]) {
return;
}
}
}
/// Visits each word in self or other that extends beyond the other. This
/// will only iterate through one of the vectors, and it only iterates
/// over the portion that doesn't overlap with the other one.
///
/// The yielded arguments are a bool, the bit offset, and a word. The bool
/// is true if the word comes from 'self', and false if it comes from
/// 'other'.
fn each_outlier(&self, other: &BitvSet,
f: &fn(bool, uint, uint) -> bool) {
let len1 = self.bitv.storage.len();
let len2 = other.bitv.storage.len();
let min = uint::min(len1, len2);
/* only one of these loops will execute and that's the point */
for self.bitv.storage.slice(min, len1).eachi |i, &w| {
if !f(true, (i + min) * uint::bits, w) {
return;
}
}
for other.bitv.storage.slice(min, len2).eachi |i, &w| {
if !f(false, (i + min) * uint::bits, w) {
return;
}
}
}
}
#[cfg(test)]
mod tests {
use std::test::BenchHarness;
use bitv::*;
use bitv;
use core::uint;
use core::vec;
use core::rand;
use core::rand::Rng;
static bench_bits : uint = 1 << 14;
#[test]
fn test_to_str() {
let zerolen = Bitv::new(0u, false);
assert!(zerolen.to_str() == ~"");
let eightbits = Bitv::new(8u, false);
assert!(eightbits.to_str() == ~"00000000");
}
#[test]
fn test_0_elements() {
let mut act;
let exp;
act = Bitv::new(0u, false);
exp = vec::from_elem::<uint>(0u, 0u);
assert!(act.eq_vec(exp));
}
#[test]
fn test_1_element() {
let mut act;
act = Bitv::new(1u, false);
assert!(act.eq_vec(~[0u]));
act = Bitv::new(1u, true);
assert!(act.eq_vec(~[1u]));
}
#[test]
fn test_2_elements() {
let mut b = bitv::Bitv::new(2, false);
b.set(0, true);
b.set(1, false);
assert!(b.to_str() == ~"10");
}
#[test]
fn test_10_elements() {
let mut act;
// all 0
act = Bitv::new(10u, false);
assert!((act.eq_vec(~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u])));
// all 1
act = Bitv::new(10u, true);
assert!((act.eq_vec(~[1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u])));
// mixed
act = Bitv::new(10u, false);
act.set(0u, true);
act.set(1u, true);
act.set(2u, true);
act.set(3u, true);
act.set(4u, true);
assert!((act.eq_vec(~[1u, 1u, 1u, 1u, 1u, 0u, 0u, 0u, 0u, 0u])));
// mixed
act = Bitv::new(10u, false);
act.set(5u, true);
act.set(6u, true);
act.set(7u, true);
act.set(8u, true);
act.set(9u, true);
assert!((act.eq_vec(~[0u, 0u, 0u, 0u, 0u, 1u, 1u, 1u, 1u, 1u])));
// mixed
act = Bitv::new(10u, false);
act.set(0u, true);
act.set(3u, true);
act.set(6u, true);
act.set(9u, true);
assert!((act.eq_vec(~[1u, 0u, 0u, 1u, 0u, 0u, 1u, 0u, 0u, 1u])));
}
#[test]
fn test_31_elements() {
let mut act;
// all 0
act = Bitv::new(31u, false);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u]));
// all 1
act = Bitv::new(31u, true);
assert!(act.eq_vec(
~[1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u,
1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u,
1u, 1u, 1u, 1u, 1u]));
// mixed
act = Bitv::new(31u, false);
act.set(0u, true);
act.set(1u, true);
act.set(2u, true);
act.set(3u, true);
act.set(4u, true);
act.set(5u, true);
act.set(6u, true);
act.set(7u, true);
assert!(act.eq_vec(
~[1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u]));
// mixed
act = Bitv::new(31u, false);
act.set(16u, true);
act.set(17u, true);
act.set(18u, true);
act.set(19u, true);
act.set(20u, true);
act.set(21u, true);
act.set(22u, true);
act.set(23u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 0u, 0u,
0u, 0u, 0u, 0u, 0u]));
// mixed
act = Bitv::new(31u, false);
act.set(24u, true);
act.set(25u, true);
act.set(26u, true);
act.set(27u, true);
act.set(28u, true);
act.set(29u, true);
act.set(30u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 1u, 1u,
1u, 1u, 1u, 1u, 1u]));
// mixed
act = Bitv::new(31u, false);
act.set(3u, true);
act.set(17u, true);
act.set(30u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 1u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 1u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 1u]));
}
#[test]
fn test_32_elements() {
let mut act;
// all 0
act = Bitv::new(32u, false);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u]));
// all 1
act = Bitv::new(32u, true);
assert!(act.eq_vec(
~[1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u,
1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u,
1u, 1u, 1u, 1u, 1u, 1u]));
// mixed
act = Bitv::new(32u, false);
act.set(0u, true);
act.set(1u, true);
act.set(2u, true);
act.set(3u, true);
act.set(4u, true);
act.set(5u, true);
act.set(6u, true);
act.set(7u, true);
assert!(act.eq_vec(
~[1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u]));
// mixed
act = Bitv::new(32u, false);
act.set(16u, true);
act.set(17u, true);
act.set(18u, true);
act.set(19u, true);
act.set(20u, true);
act.set(21u, true);
act.set(22u, true);
act.set(23u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u]));
// mixed
act = Bitv::new(32u, false);
act.set(24u, true);
act.set(25u, true);
act.set(26u, true);
act.set(27u, true);
act.set(28u, true);
act.set(29u, true);
act.set(30u, true);
act.set(31u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 1u, 1u,
1u, 1u, 1u, 1u, 1u, 1u]));
// mixed
act = Bitv::new(32u, false);
act.set(3u, true);
act.set(17u, true);
act.set(30u, true);
act.set(31u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 1u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 1u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 1u, 1u]));
}
#[test]
fn test_33_elements() {
let mut act;
// all 0
act = Bitv::new(33u, false);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u]));
// all 1
act = Bitv::new(33u, true);
assert!(act.eq_vec(
~[1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u,
1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u,
1u, 1u, 1u, 1u, 1u, 1u, 1u]));
// mixed
act = Bitv::new(33u, false);
act.set(0u, true);
act.set(1u, true);
act.set(2u, true);
act.set(3u, true);
act.set(4u, true);
act.set(5u, true);
act.set(6u, true);
act.set(7u, true);
assert!(act.eq_vec(
~[1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u]));
// mixed
act = Bitv::new(33u, false);
act.set(16u, true);
act.set(17u, true);
act.set(18u, true);
act.set(19u, true);
act.set(20u, true);
act.set(21u, true);
act.set(22u, true);
act.set(23u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 1u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u]));
// mixed
act = Bitv::new(33u, false);
act.set(24u, true);
act.set(25u, true);
act.set(26u, true);
act.set(27u, true);
act.set(28u, true);
act.set(29u, true);
act.set(30u, true);
act.set(31u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 1u, 1u,
1u, 1u, 1u, 1u, 1u, 1u, 0u]));
// mixed
act = Bitv::new(33u, false);
act.set(3u, true);
act.set(17u, true);
act.set(30u, true);
act.set(31u, true);
act.set(32u, true);
assert!(act.eq_vec(
~[0u, 0u, 0u, 1u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 1u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u,
0u, 0u, 0u, 0u, 1u, 1u, 1u]));
}
#[test]
fn test_equal_differing_sizes() {
let v0 = Bitv::new(10u, false);
let v1 = Bitv::new(11u, false);
assert!(!v0.equal(&v1));
}
#[test]
fn test_equal_greatly_differing_sizes() {
let v0 = Bitv::new(10u, false);
let v1 = Bitv::new(110u, false);
assert!(!v0.equal(&v1));
}
#[test]
fn test_equal_sneaky_small() {
let mut a = bitv::Bitv::new(1, false);
a.set(0, true);
let mut b = bitv::Bitv::new(1, true);
b.set(0, true);
assert!(a.equal(&b));
}
#[test]
fn test_equal_sneaky_big() {
let mut a = bitv::Bitv::new(100, false);
for uint::range(0, 100) |i| {
a.set(i, true);
}
let mut b = bitv::Bitv::new(100, true);
for uint::range(0, 100) |i| {
b.set(i, true);
}
assert!(a.equal(&b));
}
#[test]
fn test_from_bytes() {
let bitv = from_bytes([0b10110110, 0b00000000, 0b11111111]);
let str = ~"10110110" + ~"00000000" + ~"11111111";
assert!(bitv.to_str() == str);
}
#[test]
fn test_to_bytes() {
let mut bv = Bitv::new(3, true);
bv.set(1, false);
assert!(bv.to_bytes() == ~[0b10100000]);
let mut bv = Bitv::new(9, false);
bv.set(2, true);
bv.set(8, true);
assert!(bv.to_bytes() == ~[0b00100000, 0b10000000]);
}
#[test]
fn test_from_bools() {
assert!(from_bools([true, false, true, true]).to_str() ==
~"1011");
}
#[test]
fn test_to_bools() {
let bools = ~[false, false, true, false, false, true, true, false];
assert!(from_bytes([0b00100110]).to_bools() == bools);
}
#[test]
fn test_small_difference() {
let mut b1 = Bitv::new(3, false);
let mut b2 = Bitv::new(3, false);
b1.set(0, true);
b1.set(1, true);
b2.set(1, true);
b2.set(2, true);
assert!(b1.difference(&b2));
assert!(b1[0]);
assert!(!b1[1]);
assert!(!b1[2]);
}
#[test]
fn test_big_difference() {
let mut b1 = Bitv::new(100, false);
let mut b2 = Bitv::new(100, false);
b1.set(0, true);
b1.set(40, true);
b2.set(40, true);
b2.set(80, true);
assert!(b1.difference(&b2));
assert!(b1[0]);
assert!(!b1[40]);
assert!(!b1[80]);
}
#[test]
fn test_small_clear() {
let mut b = Bitv::new(14, true);
b.clear();
for b.ones |i| {
fail!(fmt!("found 1 at %?", i));
}
}
#[test]
fn test_big_clear() {
let mut b = Bitv::new(140, true);
b.clear();
for b.ones |i| {
fail!(fmt!("found 1 at %?", i));
}
}
#[test]
fn test_bitv_set_basic() {
let mut b = BitvSet::new();
assert!(b.insert(3));
assert!(!b.insert(3));
assert!(b.contains(&3));
assert!(b.insert(400));
assert!(!b.insert(400));
assert!(b.contains(&400));
assert!(b.len() == 2);
}
#[test]
fn test_bitv_set_intersection() {
let mut a = BitvSet::new();
let mut b = BitvSet::new();
assert!(a.insert(11));
assert!(a.insert(1));
assert!(a.insert(3));
assert!(a.insert(77));
assert!(a.insert(103));
assert!(a.insert(5));
assert!(b.insert(2));
assert!(b.insert(11));
assert!(b.insert(77));
assert!(b.insert(5));
assert!(b.insert(3));
let mut i = 0;
let expected = [3, 5, 11, 77];
for a.intersection(&b) |x| {
assert!(*x == expected[i]);
i += 1
}
assert!(i == expected.len());
}
#[test]
fn test_bitv_set_difference() {
let mut a = BitvSet::new();
let mut b = BitvSet::new();
assert!(a.insert(1));
assert!(a.insert(3));
assert!(a.insert(5));
assert!(a.insert(200));
assert!(a.insert(500));
assert!(b.insert(3));
assert!(b.insert(200));
let mut i = 0;
let expected = [1, 5, 500];
for a.difference(&b) |x| {
assert!(*x == expected[i]);
i += 1
}
assert!(i == expected.len());
}
#[test]
fn test_bitv_set_symmetric_difference() {
let mut a = BitvSet::new();
let mut b = BitvSet::new();
assert!(a.insert(1));
assert!(a.insert(3));
assert!(a.insert(5));
assert!(a.insert(9));
assert!(a.insert(11));
assert!(b.insert(3));
assert!(b.insert(9));
assert!(b.insert(14));
assert!(b.insert(220));
let mut i = 0;
let expected = [1, 5, 11, 14, 220];
for a.symmetric_difference(&b) |x| {
assert!(*x == expected[i]);
i += 1
}
assert!(i == expected.len());
}
#[test]
fn test_bitv_set_union() {
let mut a = BitvSet::new();
let mut b = BitvSet::new();
assert!(a.insert(1));
assert!(a.insert(3));
assert!(a.insert(5));
assert!(a.insert(9));
assert!(a.insert(11));
assert!(a.insert(160));
assert!(a.insert(19));
assert!(a.insert(24));
assert!(b.insert(1));
assert!(b.insert(5));
assert!(b.insert(9));
assert!(b.insert(13));
assert!(b.insert(19));
let mut i = 0;
let expected = [1, 3, 5, 9, 11, 13, 19, 24, 160];
for a.union(&b) |x| {
assert!(*x == expected[i]);
i += 1
}
assert!(i == expected.len());
}
#[test]
fn test_bitv_remove() {
let mut a = BitvSet::new();
assert!(a.insert(1));
assert!(a.remove(&1));
assert!(a.insert(100));
assert!(a.remove(&100));
assert!(a.insert(1000));
assert!(a.remove(&1000));
assert!(a.capacity() == uint::bits);
}
fn rng() -> rand::IsaacRng {
let seed = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
rand::IsaacRng::new_seeded(seed)
}
#[bench]
fn bench_uint_small(b: &mut BenchHarness) {
let r = rng();
let mut bitv = 0 as uint;
do b.iter {
bitv |= (1 << ((r.next() as uint) % uint::bits));
}
}
#[bench]
fn bench_small_bitv_small(b: &mut BenchHarness) {
let r = rng();
let mut bitv = SmallBitv::new(uint::bits);
do b.iter {
bitv.set((r.next() as uint) % uint::bits, true);
}
}
#[bench]
fn bench_big_bitv_small(b: &mut BenchHarness) {
let r = rng();
let mut bitv = BigBitv::new(~[0]);
do b.iter {
bitv.set((r.next() as uint) % uint::bits, true);
}
}
#[bench]
fn bench_big_bitv_big(b: &mut BenchHarness) {
let r = rng();
let mut storage = ~[];
storage.grow(bench_bits / uint::bits, &0);
let mut bitv = BigBitv::new(storage);
do b.iter {
bitv.set((r.next() as uint) % bench_bits, true);
}
}
#[bench]
fn bench_bitv_big(b: &mut BenchHarness) {
let r = rng();
let mut bitv = Bitv::new(bench_bits, false);
do b.iter {
bitv.set((r.next() as uint) % bench_bits, true);
}
}
#[bench]
fn bench_bitv_small(b: &mut BenchHarness) {
let r = rng();
let mut bitv = Bitv::new(uint::bits, false);
do b.iter {
bitv.set((r.next() as uint) % uint::bits, true);
}
}
#[bench]
fn bench_bitv_set_small(b: &mut BenchHarness) {
let r = rng();
let mut bitv = BitvSet::new();
do b.iter {
bitv.insert((r.next() as uint) % uint::bits);
}
}
#[bench]
fn bench_bitv_set_big(b: &mut BenchHarness) {
let r = rng();
let mut bitv = BitvSet::new();
do b.iter {
bitv.insert((r.next() as uint) % bench_bits);
}
}
#[bench]
fn bench_bitv_big_union(b: &mut BenchHarness) {
let mut b1 = Bitv::new(bench_bits, false);
let mut b2 = Bitv::new(bench_bits, false);
do b.iter {
b1.union(&b2);
}
}
}
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