fastnum 0.7.4

Fast decimal numbers library
Documentation 
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use bytes::{BufMut, BytesMut};
use core::error::Error;
use tokio_postgres::types::{accepts, to_sql_checked, FromSql, IsNull, ToSql, Type};

use crate::decimal::{
    errors::parse::pretty_error_msg, extras::utils::db::postgres::NBase, Decimal, ParseError,
    UnsignedDecimal,
};

type D<const N: usize> = Decimal<N>;
type UD<const N: usize> = UnsignedDecimal<N>;

impl<'a, const N: usize> FromSql<'a> for UD<N> {
    fn from_sql(_: &Type, raw: &'a [u8]) -> Result<Self, Box<dyn Error + Sync + Send>> {
        let dec: D<N> = NBase::decode(raw)?
            .try_into()
            .map_err(|e| pretty_error_msg(UD::<N>::type_name(), e))?;

        if dec.is_negative() {
            return Err(pretty_error_msg(Self::type_name(), ParseError::Signed).into());
        }

        Ok(UD::new(dec))
    }

    accepts!(NUMERIC);
}

impl<const N: usize> ToSql for UD<N> {
    fn to_sql(&self, _: &Type, out: &mut BytesMut) -> Result<IsNull, Box<dyn Error + Sync + Send>>
    where
        Self: Sized,
    {
        let nbase: NBase = self
            .0
            .try_into()
            .map_err(|e| pretty_error_msg(D::<N>::type_name(), e))?;
        nbase.encode(&mut out.writer())?;

        Ok(IsNull::No)
    }

    accepts!(NUMERIC);
    to_sql_checked!();
}