wild

fixed_wide/src/lib.rs

@@ -1 +1,2 @@
 pub mod wide;
+pub mod types;

fixed_wide/src/types.rs

@@ -0,0 +1,2 @@
+pub type I256F128=crate::wide::FixedI256<typenum::consts::U128>;
+pub type I512F256=crate::wide::FixedI512<typenum::consts::U256>;

fixed_wide/src/wide.rs

@@ -1,13 +1,10 @@
+use bnum::cast::As;
 use bnum::types::{I256,I512};
 use fixed::{FixedI64,FixedI128};
 use typenum::{Sum, Unsigned};
 use typenum::consts::{U32,U64,U96,U128,U160,U192,U224,U256};
 
-pub trait WideMul<Rhs=Self>{
-	type Output;
-	fn wide_mul(self,rhs:Rhs)->Self::Output;
-}
-
+#[derive(Clone,Copy,Debug)]
 pub struct Fixed<Int,Frac>{
 	bits:Int,
 	phantom:std::marker::PhantomData<Frac>,
@@ -15,6 +12,28 @@ pub struct Fixed<Int,Frac>{
 pub type FixedI256<Frac>=Fixed<I256,Frac>;
 pub type FixedI512<Frac>=Fixed<I512,Frac>;
 
+impl<Int:From<i128>+std::ops::Shl<u32,Output=Int>,FracDst:Unsigned> From<i128> for Fixed<Int,FracDst>{
+	fn from(value:i128)->Self{
+		Self{
+			bits:Int::from(value)<<FracDst::U32,
+			phantom:std::marker::PhantomData,
+		}
+	}
+}
+
+impl<Int:PartialEq,Frac> PartialEq for Fixed<Int,Frac>{
+	fn eq(&self,other:&Self)->bool{
+		self.bits==other.bits
+	}
+}
+impl<Int:Eq,Frac> Eq for Fixed<Int,Frac>{}
+
+pub trait WideMul<Rhs=Self>{
+	type Output;
+	fn wide_mul(self,rhs:Rhs)->Self::Output;
+}
+
+//going wide from foreign fixed type
 impl<A,B> WideMul<FixedI128<B>> for FixedI128<A>
 	where
 		A:std::ops::Add<B>,
@@ -28,3 +47,40 @@ impl<A,B> WideMul<FixedI128<B>> for FixedI128<A>
 		}
 	}
 }
+//going wider native
+impl<A,B> WideMul<FixedI256<B>> for FixedI256<A>
+	where
+		A:std::ops::Add<B>,
+		B:Unsigned,
+{
+	type Output=FixedI512<Sum<A,B>>;
+	fn wide_mul(self,rhs:FixedI256<B>)->Self::Output{
+		FixedI512{
+			bits:self.bits.as_::<I512>()*rhs.bits.as_::<I512>(),
+			phantom:std::marker::PhantomData,
+		}
+	}
+}
+
+pub enum Narrower<T>{
+	Fits(T),
+	Max,
+	Min,
+}
+
+fn tat(){
+	let a:i8=match 257i64.try_into() {
+		Ok(it) => it,
+		Err(err) => panic!(),
+	};
+}
+
+//i16 -> i8
+// 257i16.try_narrow::<i8>() -> Narrower::Max
+// 128i16.try_narrow::<i8>() -> Narrower::Fits(128i8)
+// -257i16.try_narrow::<i8>() -> Narrower::Min
+
+pub trait TryNarrow<Rhs=Self>{
+	type Output;
+	fn wide_mul(self,rhs:Rhs)->Self::Output;
+}

src/lib.rs

@@ -1,22 +1,9 @@
-use bnum::cast::As;
+use fixed_wide::wide::WideMul;
 
 type Planar64=fixed::types::I32F32;
 type Planar64Wide1=fixed::types::I64F64;
-type Planar64Wide2=bnum::types::I256;
-type Planar64Wide3=bnum::types::I512;
-//wouldn't that be nice
-//type Planar64Wide2=fixed::FixedI256<fixed::types::extra::U128>;
-//type Planar64Wide3=fixed::FixedI512<fixed::types::extra::U256>;
-
-pub fn wide_mul(left: Planar64, right: Planar64) -> Planar64Wide1 {
-	left.wide_mul(right)
-}
-pub fn wide_mul_2(left: Planar64Wide1, right: Planar64Wide1) -> Planar64Wide2 {
-	Planar64Wide2::from(left.to_bits())*Planar64Wide2::from(right.to_bits())
-}
-pub fn wide_mul_3(left: Planar64Wide2, right: Planar64Wide2) -> Planar64Wide3 {
-	left.as_::<Planar64Wide3>()*right.as_::<Planar64Wide3>()
-}
+type Planar64Wide2=fixed_wide::types::I256F128;
+type Planar64Wide3=fixed_wide::types::I512F256;
 
 #[cfg(test)]
 mod tests {
@@ -24,13 +11,18 @@ mod tests {
 
 	#[test]
 	fn it_works() {
-		let result = add(2.into(), 2.into());
-		assert_eq!(result, 4);
+		let a=Planar64::from(2);
+		let b=Planar64::from(3);
+
+		let w1=a.wide_mul(b);
+		let w2=w1.wide_mul(w1);
+		let w3=w2.wide_mul(w2);
+
+		assert_eq!(w3,Planar64Wide3::from(1296));
 	}
 
 	#[test]
 	pub fn main(){
-		let a=6f128;
 		let max=i32::MAX as i64;
 		println!("{} {}",max*max,i64::MAX);
 	}