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use std::ptr;
pub struct NamedStorage<T: ?Sized> {
pub name: String,
pub contents: Box<T>,
}
pub enum Subset {
AllPlain,
AllKeyed,
}
pub enum SerializationFormat {
SimpleJson,
}
pub trait Flatten {
fn as_u32(&self) -> u32;
}
impl Flatten for u32 {
fn as_u32(&self) -> u32 {
*self
}
}
impl Flatten for () {
fn as_u32(&self) -> u32 {
0
}
}
impl Flatten for bool {
fn as_u32(&self) -> u32 {
if *self {
1
} else {
0
}
}
}
pub struct LinearBuckets {
min: u32,
max: u32,
pub buckets: usize,
}
impl LinearBuckets {
pub fn new(min: u32, max: u32, buckets: usize) -> LinearBuckets {
assert!(min < max);
assert!(buckets > 0);
assert!(buckets < (max - min) as usize);
LinearBuckets {
min: min,
max: max,
buckets: buckets
}
}
pub fn get_bucket(&self, value: u32) -> usize {
if value <= self.min {
0
} else if value >= self.max {
self.buckets - 1 as usize
} else {
let num = value as f32 - self.min as f32;
let den = self.max as f32 - self.min as f32;
let res = (num / den) * self.buckets as f32;
res as usize
}
}
}
pub fn vec_resize<T>(vec: &mut Vec<T>, min_len: usize, value: T)
where T: Clone
{
let len = vec.len();
if min_len <= len {
return;
}
let delta = min_len - len;
vec.reserve(delta);
unsafe {
let mut ptr = vec.as_mut_ptr().offset(len as isize);
for i in 1..delta {
ptr::write(ptr, value.clone());
ptr = ptr.offset(1);
vec.set_len(len + i);
}
ptr::write(ptr, value);
vec.set_len(len + delta);
}
}
pub fn vec_with_size<T>(size: usize, value: T) -> Vec<T>
where T: Clone
{
let mut vec = Vec::with_capacity(size);
unsafe {
vec.set_len(size);
for i in 0 .. size {
vec[i] = value.clone();
}
}
vec
}