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|
use std::mem;
use cast::From as _0;
use crate::traits::Data;
macro_rules! impl_data {
($($ty:ty),+) => {
$(
impl Data for $ty {
fn f64(self) -> f64 {
f64::cast(self)
}
}
impl<'a> Data for &'a $ty {
fn f64(self) -> f64 {
f64::cast(*self)
}
}
)+
}
}
impl_data!(f32, f64, i16, i32, i64, i8, isize, u16, u32, u64, u8, usize);
#[derive(Clone)]
pub struct Matrix {
bytes: Vec<u8>,
ncols: usize,
nrows: usize,
}
impl Matrix {
pub fn new<I>(rows: I, scale: <I::Item as Row>::Scale) -> Matrix
where
I: Iterator,
I::Item: Row,
{
let ncols = I::Item::ncols();
let bytes_per_row = ncols * mem::size_of::<f64>();
let mut bytes = Vec::with_capacity(rows.size_hint().0 * bytes_per_row);
let mut nrows = 0;
for row in rows {
nrows += 1;
row.append_to(&mut bytes, scale);
}
Matrix {
bytes,
ncols,
nrows,
}
}
pub fn bytes(&self) -> &[u8] {
&self.bytes
}
pub fn ncols(&self) -> usize {
self.ncols
}
pub fn nrows(&self) -> usize {
self.nrows
}
}
/// Data that can serve as a row of the data matrix
pub trait Row {
/// Private
type Scale: Copy;
/// Append this row to a buffer
fn append_to(self, buffer: &mut Vec<u8>, scale: Self::Scale);
/// Number of columns of the row
fn ncols() -> usize;
}
fn write_f64(w: &mut impl std::io::Write, f: f64) -> std::io::Result<()> {
w.write_all(&f.to_bits().to_le_bytes())
}
impl<A, B> Row for (A, B)
where
A: Data,
B: Data,
{
type Scale = (f64, f64);
fn append_to(self, buffer: &mut Vec<u8>, scale: (f64, f64)) {
let (a, b) = self;
write_f64(buffer, a.f64() * scale.0).unwrap();
write_f64(buffer, b.f64() * scale.1).unwrap();
}
fn ncols() -> usize {
2
}
}
impl<A, B, C> Row for (A, B, C)
where
A: Data,
B: Data,
C: Data,
{
type Scale = (f64, f64, f64);
fn append_to(self, buffer: &mut Vec<u8>, scale: (f64, f64, f64)) {
let (a, b, c) = self;
write_f64(buffer, a.f64() * scale.0).unwrap();
write_f64(buffer, b.f64() * scale.1).unwrap();
write_f64(buffer, c.f64() * scale.2).unwrap();
}
fn ncols() -> usize {
3
}
}
impl<A, B, C, D> Row for (A, B, C, D)
where
A: Data,
B: Data,
C: Data,
D: Data,
{
type Scale = (f64, f64, f64, f64);
fn append_to(self, buffer: &mut Vec<u8>, scale: (f64, f64, f64, f64)) {
let (a, b, c, d) = self;
write_f64(buffer, a.f64() * scale.0).unwrap();
write_f64(buffer, b.f64() * scale.1).unwrap();
write_f64(buffer, c.f64() * scale.2).unwrap();
write_f64(buffer, d.f64() * scale.3).unwrap();
}
fn ncols() -> usize {
4
}
}
impl<A, B, C, D, E> Row for (A, B, C, D, E)
where
A: Data,
B: Data,
C: Data,
D: Data,
E: Data,
{
type Scale = (f64, f64, f64, f64, f64);
#[cfg_attr(feature = "cargo-clippy", allow(clippy::many_single_char_names))]
fn append_to(self, buffer: &mut Vec<u8>, scale: (f64, f64, f64, f64, f64)) {
let (a, b, c, d, e) = self;
write_f64(buffer, a.f64() * scale.0).unwrap();
write_f64(buffer, b.f64() * scale.1).unwrap();
write_f64(buffer, c.f64() * scale.2).unwrap();
write_f64(buffer, d.f64() * scale.3).unwrap();
write_f64(buffer, e.f64() * scale.4).unwrap();
}
fn ncols() -> usize {
5
}
}
|
