[rust-dev] Why are generic integers not usable as floats?

Cameron Zwarich zwarich at mozilla.com
Thu Jun 19 16:06:59 PDT 2014


Not all integer constants can be perfectly represented as floating-point values. What do you propose in that case, just a hard error?

Cameron

> On Jun 19, 2014, at 4:02 PM, Matthew McPherrin <matt at mcpherrin.ca> wrote:
> 
> This came up on IRC today, and it was something I've wondered in the past but nobody had an immediately good answer either way.
> 
> I think it's fairly inconsistent that these two code samples aren't equivalent:
> 
>     let a = 1f32;
>   let b: f32 = 1;
> 
> It's fairly annoying in my opinion to have to occasionally add a .0 after floating point literals.
> 
> Especially since we're getting rid of integer fallback in RFC 30, I think this issue ought to be thought about.
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