Trait num_traits::Num[−][src]

pub trait Num: PartialEq + Zero + One + NumOps {
    type FromStrRadixErr;
    fn from_str_radix(
        str: &str, 
        radix: u32
    ) -> Result<Self, Self::FromStrRadixErr>;
}

The base trait for numeric types, covering 0 and 1 values, comparisons, basic numeric operations, and string conversion.

Associated Types

`type FromStrRadixErr`[src]

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Required methods

`fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr>`[src]

Convert from a string and radix (typically 2..=36).

Examples

use num_traits::Num;

let result = <i32 as Num>::from_str_radix("27", 10);
assert_eq!(result, Ok(27));

let result = <i32 as Num>::from_str_radix("foo", 10);
assert!(result.is_err());

Supported radices

The exact range of supported radices is at the discretion of each type implementation. For primitive integers, this is implemented by the inherent from_str_radix methods in the standard library, which panic if the radix is not in the range from 2 to 36. The implementation in this crate for primitive floats is similar.

For third-party types, it is suggested that implementations should follow suit and at least accept 2..=36 without panicking, but an Err may be returned for any unsupported radix. It’s possible that a type might not even support the common radix 10, nor any, if string parsing doesn’t make sense for that type.

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Implementations on Foreign Types

`impl<T: Num> Num for Wrapping<T> where Wrapping<T>: Add<Output = Wrapping<T>> + Sub<Output = Wrapping<T>> + Mul<Output = Wrapping<T>> + Div<Output = Wrapping<T>> + Rem<Output = Wrapping<T>>,` [src]

`type FromStrRadixErr = T::FromStrRadixErr`

`fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr>`[src]

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Implementors

`impl Num for f32`[src]

`type FromStrRadixErr = ParseFloatError`

`fn from_str_radix(src: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr>`[src]

`impl Num for f64`[src]

`type FromStrRadixErr = ParseFloatError`

`fn from_str_radix(src: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr>`[src]

`impl Num for i8`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for i16`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for i32`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for i64`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for i128`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for isize`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for u8`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for u16`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for u32`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for u64`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for u128`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

`impl Num for usize`[src]

`type FromStrRadixErr = ParseIntError`

`fn from_str_radix(s: &str, radix: u32) -> Result<Self, ParseIntError>`[src]

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