burbomath 0.0.2

Burbokop's rust math library
Documentation 
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use crate::{NonNeg, Positive};

pub trait UnsignedContstant<const N: usize> {
    fn unsigned_contstant() -> Self;
}

/// For shorter
pub fn uconst<const N: usize, T: UnsignedContstant<N>>() -> T {
    UnsignedContstant::unsigned_contstant()
}

macro_rules! impl_unsigned_contstant {
    ( $($tp: ty),+ ) => {
        $(
            impl<const N: usize> UnsignedContstant<N> for $tp {
                fn unsigned_contstant() -> Self { N as Self }
            }
        )+
    };
}

impl_unsigned_contstant! { f32, f64, i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize, usize }

impl<T, const N: usize> UnsignedContstant<N> for NonNeg<T>
where
    T: UnsignedContstant<N>,
{
    fn unsigned_contstant() -> Self {
        unsafe { NonNeg::new_const_unchecked(UnsignedContstant::unsigned_contstant()) }
    }
}

pub trait PositiveConstant<const N: usize> {
    const OK: usize = {
        assert!(N > 0, "N must be greater than 0");
        N
    };
}

impl<T, const N: usize> PositiveConstant<N> for Positive<T> where T: UnsignedContstant<N> {}

// Uncomment whem generic_const_exprs compiler feature will be in stable channel and remove previous dirty implementation togather with `PositiveConstant` trait
//
// impl<T, const N: usize> UnsignedContstant<N> for Positive<T>
// where
//     [(); N - 1]:,
//     T: UnsignedContstant<N>,
// {
//     fn unsigned_contstant() -> Self {
//         unsafe { Positive::new_const_unchecked(UnsignedContstant::unsigned_contstant()) }
//     }
// }
impl<T, const N: usize> UnsignedContstant<N> for Positive<T>
where
    T: UnsignedContstant<N>,
    Self: PositiveConstant<N>,
{
    fn unsigned_contstant() -> Self {
        let _ = Self::OK;
        unsafe { Positive::new_const_unchecked(UnsignedContstant::unsigned_contstant()) }
    }
}

pub trait Zero {
    fn zero() -> Self;
}

impl<T: UnsignedContstant<0>> Zero for T {
    fn zero() -> Self {
        UnsignedContstant::unsigned_contstant()
    }
}

pub trait One {
    fn one() -> Self;
}

impl<T: UnsignedContstant<1>> One for T {
    fn one() -> Self {
        UnsignedContstant::unsigned_contstant()
    }
}

pub trait Two {
    fn two() -> Self;
}

impl<T: UnsignedContstant<2>> Two for T {
    fn two() -> Self {
        UnsignedContstant::unsigned_contstant()
    }
}

pub trait MinusOne {
    fn minus_one() -> Self;
}

macro_rules! impl_minus_one {
    ( $($tp: ty),+ ) => {
        $(
            impl MinusOne for $tp {
                fn minus_one() -> Self { (-1) as $tp }
            }
        )+
    };
}

impl_minus_one! { f32, f64, i8, i16, i32, i64, i128, isize }

pub trait Pi {
    fn pi() -> Self;
}

macro_rules! impl_pi {
    ( $($tp: ident),+ ) => {
        $(
            impl Pi for $tp {
                fn pi() -> Self { core::$tp::consts::PI }
            }
        )+
    };
}

impl_pi! { f32, f64 }

pub trait TopLimit {
    fn top_limit() -> Self;
}

macro_rules! impl_top_limit {
    ( $($tp: ty),+ ) => {
        $(
            impl TopLimit for $tp {
                fn top_limit() -> Self { <$tp>::MAX }
            }
        )+
    };
}

impl_top_limit! { f32, f64, i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize, usize }

pub trait BottomLimit {
    fn bottom_limit() -> Self;
}

macro_rules! impl_bottom_limit {
    ( $($tp: ty),+ ) => {
        $(
            impl BottomLimit for $tp {
                fn bottom_limit() -> Self { <$tp>::MIN }
            }
        )+
    };
}

impl_bottom_limit! { f32, f64, i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize, usize }