Trait num_traits::Num

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pub trait Num: PartialEq + Zero + One + NumOps {
    type FromStrRadixErr;

    fn from_str_radix(
        str: &str,
        radix: u32
    ) -> Result<Self, Self::FromStrRadixErr>; }
Expand description

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

Required Associated Types§

Required Methods§

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

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.

Implementations on Foreign Types§

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impl Num for usize

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impl Num for u8

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impl Num for u16

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impl Num for u32

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impl Num for u64

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impl Num for isize

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impl Num for i8

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impl Num for i16

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impl Num for i32

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impl Num for i64

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impl Num for u128

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impl Num for i128

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impl<T: Num> Num for Wrapping<T>where
    Wrapping<T>: NumOps,

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impl Num for f32

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impl Num for f64

Implementors§