Enum Position

pub enum Position<'a> {
    Auto,
    Index(usize),
    Key(&'a str),
}

Refers to an argument within an argument list.

During formatting, the formatter will pull arguments from the argument list. Depending on whether the argument list supports indexed or named lookups, this might result in an error. See FormatArgs for argument list implementations.

A Position may borrow they key name from the format string.

Variants

Auto

The next indexed argument in line.

The formatter maintains an internal state to keep track of the sequence of auto-arguments. If an interim access to a specific indexed or named argument occurs, the formatter will afterwards continue after the last auto argument.

Requires the argument list to be indexable by numbers.

Index(usize)

Index argument at the given offset.

Requires the argument list to be indexable by numbers.

Key(&'a str)

Named argument with the given key.

Requires the argument list to be indexable by string keys.

Trait Implementations

impl<'a> Clone for Position<'a>

fn clone(&self) -> Position<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for Position<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Position<'_>

fn default() -> Self

Returns the “default value” for a type.

impl Display for Position<'_>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Hash for Position<'a>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a> Ord for Position<'a>

fn cmp(&self, other: &Position<'a>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<'a> PartialEq for Position<'a>

fn eq(&self, other: &Position<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialOrd for Position<'a>

fn partial_cmp(&self, other: &Position<'a>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> Copy for Position<'a>

impl<'a> Eq for Position<'a>

impl<'a> StructuralPartialEq for Position<'a>