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144 lines
2.8 KiB
144 lines
2.8 KiB
//! Contains `Collapse` impls for primitive types through a newtime wrapper.
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//!
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//! Such wrappers are a workaround for the lack of template specialisation available in Rust so far, as the generic `impl<T: Hash> Collapse<T> for T` still requires computing the hash of the internal types before reducing to the `u8` page index.
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//! For primitive types, this is unnessisary and causes a (very slight) performance loss.
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use super::*;
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use std::num::*;
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pub trait PrimitiveCollapse: private::Sealed
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{
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fn collapse(&self) -> u8;
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}
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#[derive(Debug, Clone, PartialEq, Eq, Copy, Default, Ord, PartialOrd)]
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pub struct Primitive<T>(T);
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impl<T: PrimitiveCollapse+ Eq> Collapse for Primitive<T>
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{
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#[inline(always)] fn collapse(&self) -> u8 {
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self.0.collapse()
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}
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}
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impl<T: PrimitiveCollapse+ Eq> Primitive<T>
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{
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#[const_fn]
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#[inline] pub const fn new(value: T) -> Self
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{
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Self(value)
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}
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#[inline] pub fn into_inner(self) -> T
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{
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self.0
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}
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#[const_fn]
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#[inline] pub fn inner(&self) -> &T
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{
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&self.0
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}
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#[inline] pub fn inner_mut(&mut self) -> &mut T
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{
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&mut self.0
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}
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#[const_fn]
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#[inline] pub const fn copy_into_inner(&self) -> T
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where T: Copy
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{
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self.0
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}
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}
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macro_rules! prim {
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($name:ty) => {
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impl private::Sealed for $name{}
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impl PrimitiveCollapse for $name
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{
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#[inline(always)] fn collapse(&self) -> u8 {
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(*self) as u8
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}
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}
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};
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($name:ty: +) => {
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impl private::Sealed for $name{}
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impl PrimitiveCollapse for $name
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{
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#[inline(always)] fn collapse(&self) -> u8 {
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self.get() as u8
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}
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}
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};
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($name:ty: ^) => {
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impl private::Sealed for $name{}
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impl PrimitiveCollapse for $name
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{
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#[inline(always)] fn collapse(&self) -> u8 {
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super::collapse(<$name>::to_ne_bytes(*self))
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}
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}
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};
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($name:ty: ^+) => {
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impl private::Sealed for $name{}
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impl PrimitiveCollapse for $name
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{
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#[inline(always)] fn collapse(&self) -> u8 {
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super::collapse(self.get().to_ne_bytes())
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}
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}
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};
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($name:ty: fn {$($block:tt)*}) => {
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impl private::Sealed for $name{}
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impl PrimitiveCollapse for $name
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{
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#[inline(always)] fn collapse(&self) -> u8 {
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$($block)+
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}
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}
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};
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($name:ty: {$($block:tt)*}) => {
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impl private::Sealed for $name{}
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impl PrimitiveCollapse for $name
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{
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$($block)+
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}
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};
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}
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prim!(u8);
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prim!(i8);
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prim!(u16: ^);
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prim!(i16: ^);
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prim!(u32: ^);
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prim!(i32: ^);
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prim!(u64: ^);
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prim!(i64: ^);
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prim!(u128: ^);
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prim!(i128: ^);
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prim!(isize: ^);
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prim!(usize: ^);
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prim!(NonZeroU8: +);
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prim!(NonZeroI8: +);
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prim!(NonZeroU16: ^+);
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prim!(NonZeroI16: ^+);
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prim!(NonZeroU32: ^+);
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prim!(NonZeroI32: ^+);
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prim!(NonZeroU64: ^+);
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prim!(NonZeroI64: ^+);
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prim!(NonZeroU128: ^+);
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prim!(NonZeroI128: ^+);
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prim!(NonZeroIsize: ^+);
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prim!(NonZeroUsize: ^+);
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prim!((): fn {
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0
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});
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#[cfg(nightly)]
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prim!(!: {
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fn collapse(&self) -> u8
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{
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*self
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}
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});
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