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Implement std::fmt::Display for ParseFloatError #22

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Jan 13, 2018
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Implement std::fmt::Display for ParseFloatError #22

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12 changes: 12 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
use std::ops::{Add, Sub, Mul, Div, Rem};
use std::ops::{AddAssign, SubAssign, MulAssign, DivAssign, RemAssign};
use std::num::Wrapping;
use std::fmt;

pub use bounds::Bounded;
pub use float::{Float, FloatConst};
Expand Down Expand Up @@ -163,6 +164,17 @@ pub struct ParseFloatError {
pub kind: FloatErrorKind,
}

impl fmt::Display for ParseFloatError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let description = match self.kind {
FloatErrorKind::Empty => "cannot parse float from empty string",
FloatErrorKind::Invalid => "invalid float literal",
};

description.fmt(f)
}
}

// FIXME: The standard library from_str_radix on floats was deprecated, so we're stuck
// with this implementation ourselves until we want to make a breaking change.
// (would have to drop it from `Num` though)
Expand Down