hmath 0.1.17

Big Integers and Rational Numbers
Documentation 
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use crate::{BigInt, Ratio, UBigInt, ConversionError};
use crate::impl_trivial_try_from;

macro_rules! impl_ref_for_bigints {
    (From, $t: ty) => (
        impl From<BigInt> for $t {
            fn from(n: BigInt) -> Self {
                (&n).into()
            }
        }
    );
    (TryFrom, $t: ty) => (
        impl TryFrom<BigInt> for $t {
            type Error = ConversionError;

            fn try_from(n: BigInt) -> Result<Self, Self::Error> {
                (&n).try_into()
            }
        }
    );
    (From, $t: ty, $($u: ty), +) => (
        impl_ref_for_bigints!(From, $t);
        impl_ref_for_bigints!(From, $($u),+);
    );
    (TryFrom, $t: ty, $($u: ty), +) => (
        impl_ref_for_bigints!(TryFrom, $t);
        impl_ref_for_bigints!(TryFrom, $($u),+);
    )
}

impl From<&BigInt> for bool {
    fn from(n: &BigInt) -> Self {
        !n.is_zero()
    }
}

impl_trivial_try_from!(Fallible, &BigInt, i8, to_i32);
impl_trivial_try_from!(Fallible, &BigInt, i16, to_i32);

impl_trivial_try_from!(&BigInt, i32, to_i32);
impl_trivial_try_from!(&BigInt, i64, to_i64);
impl_trivial_try_from!(Fallible, &BigInt, isize, to_i64);
impl_trivial_try_from!(&BigInt, i128, to_i128);

impl_trivial_try_from!(Fallible, &BigInt, u8, to_i32);
impl_trivial_try_from!(Fallible, &BigInt, u16, to_i32);
impl_trivial_try_from!(Fallible, &BigInt, u32, to_i64);
impl_trivial_try_from!(Fallible, &BigInt, u64, to_i128);
impl_trivial_try_from!(Fallible, &BigInt, usize, to_i128);

impl_ref_for_bigints!(
    TryFrom,
    i8, i16, i32, i64, isize, i128,
    u8, u16, u32, u64, usize, u128,
    f32, f64, UBigInt
);

impl_ref_for_bigints!(From, bool, Ratio);

impl TryFrom<&BigInt> for u128 {
    type Error = ConversionError;

    fn try_from(n: &BigInt) -> Result<Self, Self::Error> {

        if n.is_neg() {
            Err(ConversionError::NotInRange { permitted: "0~3.4e38".to_string(), error: format!("{n}") })
        }

        else {
            (&n.val).try_into()
        }

    }
}

impl TryFrom<&BigInt> for f32 {
    type Error = ConversionError;

    fn try_from(n: &BigInt) -> Result<Self, Self::Error> {
        Ok(f32::try_from(Ratio::from(n))?)
    }
}

impl TryFrom<&BigInt> for f64 {
    type Error = ConversionError;

    fn try_from(n: &BigInt) -> Result<Self, Self::Error> {
        Ok(f64::try_from(Ratio::from(n))?)
    }
}