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use serde::{Deserialize, Deserializer, Serialize, Serializer};
macro_rules! fixed_point_impl {
($name:ident, $int_bits:expr, $frac_bits:expr, $epsilons_type:ty, $value_type:ty) => {
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
pub struct $name {
pub epsilons: $epsilons_type,
}
impl $name {
pub const ZERO: Self = Self { epsilons: 0 };
pub const ONE: Self = Self { epsilons: 1 << $frac_bits };
pub const fn from_epsilons(epsilons: $epsilons_type) -> $name {
$name {epsilons: epsilons}
}
pub fn from_value(value: $value_type) -> $name {
let epsilons: $epsilons_type = (value * ((1 << $frac_bits) as $value_type)) as $epsilons_type;
$name {epsilons: epsilons}
}
}
impl From<$name> for $value_type {
fn from(fixed: $name) -> $value_type {
(fixed.epsilons as $value_type) / ((1 << $frac_bits) as $value_type)
}
}
impl ::std::ops::Add<$name> for $name {
type Output = $name;
fn add(self, rhs: $name) -> $name {
&self + &rhs
}
}
impl<'a, 'b> ::std::ops::Add<&'b $name> for &'a $name {
type Output = $name;
fn add(self, rhs: &'b $name) -> $name {
$name { epsilons: self.epsilons + rhs.epsilons }
}
}
impl ::std::ops::AddAssign<$name> for $name {
fn add_assign(&mut self, rhs: $name) -> () {
self.add_assign(&rhs)
}
}
impl<'a> ::std::ops::AddAssign<&'a $name> for $name {
fn add_assign(&mut self, rhs: &'a $name) -> () {
self.epsilons.add_assign(rhs.epsilons)
}
}
impl Serialize for $name {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
self.epsilons.serialize(serializer)
}
}
impl<'a> Deserialize<'a> for $name {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'a> {
Ok($name::from_epsilons(<$epsilons_type>::deserialize(deserializer)?))
}
}
}
}
fixed_point_impl!(Sfixed8P8, 8, 8, i16, f32);
fixed_point_impl!(Sfixed16P16, 16, 16, i32, f64);
fixed_point_impl!(Ufixed8P8, 8, 8, u16, f32);
fixed_point_impl!(Ufixed16P16, 16, 16, u32, f64);
#[cfg(test)]
mod tests {
use serde_json;
use crate::{Sfixed16P16, Sfixed8P8, Ufixed16P16, Ufixed8P8};
#[test]
fn test_eq() {
assert_eq!(Sfixed16P16::from_epsilons(3), Sfixed16P16::from_epsilons(3));
}
#[test]
fn test_default() {
const DEFAULT_SFIXED16P16: Sfixed16P16 = Sfixed16P16::from_epsilons(0);
const DEFAULT_SFIXED8P8: Sfixed8P8 = Sfixed8P8::from_epsilons(0);
const DEFAULT_UFIXED16P16: Ufixed16P16 = Ufixed16P16::from_epsilons(0);
const DEFAULT_UFIXED8P8: Ufixed8P8 = Ufixed8P8::from_epsilons(0);
assert_eq!(Sfixed16P16::default(), DEFAULT_SFIXED16P16);
assert_eq!(Sfixed8P8::default(), DEFAULT_SFIXED8P8);
assert_eq!(Ufixed16P16::default(), DEFAULT_UFIXED16P16);
assert_eq!(Ufixed8P8::default(), DEFAULT_UFIXED8P8);
}
#[test]
fn test_zero() {
assert_eq!(Sfixed16P16::ZERO, Sfixed16P16::from_epsilons(0));
assert_eq!(Sfixed8P8::ZERO, Sfixed8P8::from_epsilons(0));
assert_eq!(Ufixed16P16::ZERO, Ufixed16P16::from_epsilons(0));
assert_eq!(Ufixed8P8::ZERO, Ufixed8P8::from_epsilons(0));
}
#[test]
fn test_one() {
assert_eq!(Sfixed16P16::ONE, Sfixed16P16::from_epsilons(65536));
assert_eq!(Sfixed8P8::ONE, Sfixed8P8::from_epsilons(256));
assert_eq!(Ufixed16P16::ONE, Ufixed16P16::from_epsilons(65536));
assert_eq!(Ufixed8P8::ONE, Ufixed8P8::from_epsilons(256));
}
#[test]
fn test_json_serde_serialization() {
assert_eq!(serde_json::to_string(&Sfixed16P16::from_epsilons(3)).unwrap(), "3");
}
#[test]
fn test_json_serde_deserialization() {
assert_eq!(serde_json::from_str::<Sfixed16P16>("0").unwrap(), Sfixed16P16::from_epsilons(0));
assert_eq!(serde_json::from_str::<Sfixed16P16>("3").unwrap(), Sfixed16P16::from_epsilons(3));
assert_eq!(serde_json::from_str::<Sfixed16P16>("65536").unwrap(), Sfixed16P16::from_epsilons(65536));
assert_eq!(serde_json::from_str::<Sfixed16P16>("2147483647").unwrap(), Sfixed16P16::from_epsilons(2147483647));
assert_eq!(serde_json::from_str::<Sfixed16P16>("-2147483648").unwrap(), Sfixed16P16::from_epsilons(-2147483648));
}
#[test]
fn test_ufixed8p8() {
assert_eq!(Ufixed8P8::from_value(24f32).epsilons, 6144);
}
#[test]
fn test_ufixed8p8_value() {
assert_eq!(f32::from(Ufixed8P8::from_value(24f32)), 24f32);
assert_eq!(f32::from(Ufixed8P8::from_value(255f32)), 255f32);
}
#[test]
fn test_sfixed8p8_value() {
assert_eq!(f32::from(Sfixed8P8::from_value(-24f32)), -24f32);
}
#[test]
fn test_ufixed16p16_value() {
assert_eq!(f64::from(Ufixed16P16::from_value(1000f64)), 1000f64);
}
#[test]
fn test_add_ufixed8p8() {
assert_eq!(Ufixed8P8::from_value(0f32) + Ufixed8P8::from_value(0f32), Ufixed8P8::from_value(0f32));
assert_eq!(Ufixed8P8::from_value(0f32) + Ufixed8P8::from_value(1f32), Ufixed8P8::from_value(1f32));
assert_eq!(Ufixed8P8::from_value(1f32) + Ufixed8P8::from_value(0f32), Ufixed8P8::from_value(1f32));
assert_eq!(Ufixed8P8::from_value(1f32) + Ufixed8P8::from_value(1f32), Ufixed8P8::from_value(2f32));
assert_eq!(Ufixed8P8::from_value(0.5f32) + Ufixed8P8::from_value(0.5f32), Ufixed8P8::from_value(1f32));
}
#[test]
fn test_add_ufixed8p8_ref() {
assert_eq!(&Ufixed8P8::from_value(0f32) + &Ufixed8P8::from_value(0f32), Ufixed8P8::from_value(0f32));
assert_eq!(&Ufixed8P8::from_value(0f32) + &Ufixed8P8::from_value(1f32), Ufixed8P8::from_value(1f32));
assert_eq!(&Ufixed8P8::from_value(1f32) + &Ufixed8P8::from_value(0f32), Ufixed8P8::from_value(1f32));
assert_eq!(&Ufixed8P8::from_value(1f32) + &Ufixed8P8::from_value(1f32), Ufixed8P8::from_value(2f32));
assert_eq!(&Ufixed8P8::from_value(0.5f32) + &Ufixed8P8::from_value(0.5f32), Ufixed8P8::from_value(1f32));
}
}