Trait ValueParser

pub trait ValueParser {
    type Error;
    type Out<'a>;

    // Required method
    fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>;
}

A trait for parsing command line argument values into various types

This trait provides a unified interface for converting string values from command line arguments into different Rust types. Each implementation handles type-specific parsing logic and error reporting.

Required Associated Types

type Error

type Out<'a>

Required Methods

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl ValueParser for &str

Implementation of ValueParser for string slices

Returns a reference to the input string’s contents

type Error = Error

type Out<'a> = &'a str

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for bool

Implementation of ValueParser for boolean values

Returns true if any value is present, false otherwise

type Error = Error

type Out<'a> = bool

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for f64

type Error = Error

type Out<'a> = f64

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for i8

type Error = Error

type Out<'a> = i8

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for i16

type Error = Error

type Out<'a> = i16

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for i32

type Error = Error

type Out<'a> = i32

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for i64

type Error = Error

type Out<'a> = i64

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for i128

type Error = Error

type Out<'a> = i128

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for isize

type Error = Error

type Out<'a> = isize

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for u8

type Error = Error

type Out<'a> = u8

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for u16

type Error = Error

type Out<'a> = u16

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for u32

type Error = Error

type Out<'a> = u32

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for u64

type Error = Error

type Out<'a> = u64

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for u128

type Error = Error

type Out<'a> = u128

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for usize

type Error = Error

type Out<'a> = usize

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for String

Implementation of ValueParser for String values

Returns a cloned String from the input value

type Error = Error

type Out<'a> = String

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for Path

Implementation of ValueParser for Path references

Returns a reference to a Path created from the input string

type Error = Error

type Out<'a> = &'a Path

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

impl ValueParser for PathBuf

Implementation of ValueParser for PathBuf values

Converts the input string into a PathBuf

type Error = Error

type Out<'a> = PathBuf

fn parse(val: Option<&String>) -> Result<Self::Out<'_>, Self::Error>

Implementors