Trait std::str::FromStr
[−]
[src]
pub trait FromStr { type Err; fn from_str(s: &str) -> Result<Self, Self::Err>; }
A trait to abstract the idea of creating a new instance of a type from a string.
FromStr
's from_str()
method is often used implicitly, through
str
's parse()
method. See parse()
's documentation for examples.
Associated Types
type Err
The associated error which can be returned from parsing.
Required Methods
fn from_str(s: &str) -> Result<Self, Self::Err>
Parses a string s
to return a value of this type.
If parsing succeeds, return the value inside Ok
, otherwise
when the string is ill-formatted return an error specific to the
inside Err
. The error type is specific to implementation of the trait.
Examples
Basic usage with i32
, a type that implements FromStr
:
use std::str::FromStr; let s = "5"; let x = i32::from_str(s).unwrap(); assert_eq!(5, x);