d128 constants about decimal HOT 6 CLOSED

Will something like this work?

const D0 = d128!(0);
const D1 = d128!(1);
// more consts here

impl d128 {
  pub fn zero() -> d128 { D0 }
  pub fn one() -> d128 { D1 }
  // more functions here
}

Also are we sure we want more than 0, 1, +inf, -inf and nan?

from decimal.

const D0 = d128!(0); doesn't work atm as d128!(0) just becomes { use std::str::FromStr; d128::from_str(0) } which isn't a constant function. Another option is reimplementing the d128 macro as a plugin that converts the string at compile time.

from decimal.

At the moment I think d128::from_bytes is a good workaround.

from decimal.

How about:

impl d128 {
  pub fn zero() -> d128 { d128!(0) }
  pub fn one() -> d128 { d128!(1) }
  // more functions here
}

This means we will have the functions but they will be inefficient. When plugins are ready we can make them fast.

My main problem with with_bytes it is that it is very hard to use.

from decimal.

Yeah, the problem with this is that it is still calculating the numbers at runtime. Is there a way, using the plugin API, to compile the library and use one of the functions, then get the return value and hard code it in?

from decimal.

I don't know if there is a way. But what I know is that it is still not stabilized and available only on nightly. For that reason I want to wait until it makes it to beta before implementing something for it.

from decimal.