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use gcollections::kind::*;
use num::{Unsigned, Integer};
use num::Bounded as NumBounded;
pub trait Hull<RHS = Self>
{
type Output;
fn hull(&self, rhs: &RHS) -> Self::Output;
}
pub trait Range : Collection
{
fn new(lb: Self::Item, ub: Self::Item) -> Self;
}
pub trait Whole
{
fn whole() -> Self;
}
pub trait Width : Ord + Clone
{
type Output: Unsigned + Integer + Clone;
fn max_value() -> Self;
fn min_value() -> Self;
fn width(lower: &Self, upper: &Self) -> Self::Output;
}
macro_rules! unsigned_width_impl
{
( $( $t: ty ),* ) =>
{$(
impl Width for $t
{
type Output = $t;
fn max_value() -> $t {
<$t as NumBounded>::max_value() - 1
}
fn min_value() -> $t {
<$t as NumBounded>::min_value()
}
fn width(lower: &$t, upper: &$t) -> $t {
let lower = *lower;
let upper = *upper;
debug_assert!(upper <= <$t as Width>::max_value(),
"Width cannot be represented because the value exceeds the maximum value allowed.");
debug_assert!(lower <= upper);
upper - lower + 1
}
}
)*}
}
macro_rules! signed_width_impl
{
( $( $t: ty, $u: ty ),* ) =>
{$(
impl Width for $t
{
type Output = $u;
fn max_value() -> $t {
<$t as NumBounded>::max_value()
}
fn min_value() -> $t {
<$t as NumBounded>::min_value() + 1
}
fn width(lower: &$t, upper: &$t) -> $u {
let lower = *lower;
let upper = *upper;
debug_assert!(lower >= <$t as Width>::min_value(),
"Width cannot be represented because the value exceeds the minimum value allowed.");
debug_assert!(lower <= upper);
let size =
if lower < 0 && upper > 0 {
(-lower as $u) + (upper as $u)
} else {
(upper - lower) as $u
};
size + 1
}
}
)*}
}
unsigned_width_impl!(u8,u16,u32,u64,usize);
signed_width_impl!(i8,u8,i16,u16,i32,u32,i64,u64,isize,usize);
#[allow(non_upper_case_globals)]
#[cfg(test)]
mod tests {
use super::*;
use gcollections::ops::*;
use interval::*;
#[test]
fn strict_shrink_left() {
let empty: Interval<u32> = Interval::empty();
let i0_10: Interval<u32> = Interval::new(0, 10);
let i2_10: Interval<u32> = Interval::new(2, 10);
let ub = u32::max_value();
assert_eq!(i0_10.strict_shrink_left(ub), empty);
assert_eq!(i0_10.strict_shrink_left(10u32), empty);
assert_eq!(i0_10.strict_shrink_left(1u32), i2_10);
}
#[test]
fn strict_shrink_right() {
let empty: Interval<u32> = Interval::empty();
let i0_10: Interval<u32> = Interval::new(0, 10);
let i0_8: Interval<u32> = Interval::new(0, 8);
let lb = u32::min_value();
assert_eq!(i0_10.strict_shrink_right(lb), empty);
assert_eq!(i0_10.strict_shrink_right(0u32), empty);
assert_eq!(i0_10.strict_shrink_right(9u32), i0_8);
}
}