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56 lines
1.4 KiB
Rust
56 lines
1.4 KiB
Rust
use std::fmt;
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use std::str::{self, FromStr};
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use crate::Error;
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/// Signed decimal floating-point number.
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///
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/// See: [4.2. Attribute Lists]
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///
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/// [4.2. Attribute Lists]: https://tools.ietf.org/html/rfc8216#section-4.2
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#[derive(Debug, Clone, Copy, PartialEq, PartialOrd)]
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pub struct SignedDecimalFloatingPoint(f64);
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impl SignedDecimalFloatingPoint {
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/// Makes a new `SignedDecimalFloatingPoint` instance.
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///
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/// # Errors
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///
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/// The given value must be finite,
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/// otherwise this function will return an error that has the kind `ErrorKind::InvalidInput`.
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pub fn new(n: f64) -> crate::Result<Self> {
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if !n.is_finite() {
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Err(Error::invalid_input())
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} else {
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Ok(SignedDecimalFloatingPoint(n))
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}
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}
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/// Converts `DecimalFloatingPoint` to `f64`.
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pub const fn as_f64(self) -> f64 {
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self.0
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}
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}
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impl From<i32> for SignedDecimalFloatingPoint {
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fn from(f: i32) -> Self {
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SignedDecimalFloatingPoint(f64::from(f))
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}
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}
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impl Eq for SignedDecimalFloatingPoint {}
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impl fmt::Display for SignedDecimalFloatingPoint {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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self.0.fmt(f)
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}
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}
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impl FromStr for SignedDecimalFloatingPoint {
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type Err = Error;
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fn from_str(input: &str) -> Result<Self, Self::Err> {
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SignedDecimalFloatingPoint::new(input.parse().map_err(Error::parse_float_error)?)
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}
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}
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