How to parse a string into a Float with high precision using the rug crate in Rust?

i'm currently using the rug crate in Rust to work with high precision numbers (specifically `Float`

). I need to parse a string into a `Float`

with very high precision, and I'm encountering an issue with the `Float::parse`

method. It returns a `Result<ParseIncomplete, ParseFloatError>`

. How can I properly extract the parsed Float from the `Result`

?"

I'm working on a Rust project that involves high-precision floating-point arithmetic, and I've chosen to use the `rug`

crate for its `Float`

type, which offers arbitrary precision. I'm encountering a couple of issues that I need help with.

First, when I use the parse method on the `Float`

type, I get a `Result`

that, when successful, contains a `ParseIncomplete`

value. This `ParseIncomplete`

is a tuple struct that includes the parsed `Float`

and the remainder of the input string. I'm finding this a bit difficult to work with and I'm not sure I'm handling it correctly.

Here's a snippet of my code:

```
let target_value = match Float::parse(&opt.target_value) {
Ok((f, _)) => f,
Err(e) => return Err(e),
};
```

Second, I'm facing an issue when trying to perform arithmetic operations where Float needs to interact with standard `f64`

numbers. For instance, in this line of code:

```
let result = (target_value * 3.0 / 4.0).cbrt();
```

I'm getting type errors because `Float`

and `f64`

aren't directly compatible.

I tried using `parse_complete`

, which returns the `Float`

directly, but I'm still stuck on the arithmetic issue. Here's how I used parse_complete:

```
let target_value = Float::parse_complete(&opt.target_value)?;
```

My questions are:

How can I properly handle the result of `Float::parse`

? Is there a better way to extract the parsed `Float`

value and ignore the remainder of the string? How can I perform arithmetic operations that involve both `Float`

and `f64`

numbers? Any guidance would be greatly appreciated. Thank you!