Enum slyce::Index

pub enum Index {
    Head(usize),
    Tail(usize),
    Default,
}

A position inside an array.

Tail indices are represented with a distinct enumeration variant so that the full index numeric range (usize) can be utilized without numeric overflows.

Variants

Head(usize)

Position in the array relative to the start of the array (i.e. absolute position). Head(0) is the position of the first element of a non-empty array.

Tail(usize)

Position in the array relative to the end of the array. Tail(1) is the position of the last element of a non-empty array.

Default

Either the first or the last element of the array, depending on the sign of step.

Trait Implementations

impl Clone for Index

pub fn clone(&self) -> Index

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Index

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

Formats the value using the given formatter.

impl Default for Index

pub fn default() -> Self

Returns the "default value" for a type.

impl Display for Index

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

Formats the value using the given formatter.

impl Eq for Index

impl<U> From<Option<U>> for Index where
    U: Into<Index>, 

pub fn from(i: Option<U>) -> Self

Performs the conversion.

impl From<i32> for Index

pub fn from(i: i32) -> Self

Performs the conversion.

impl From<isize> for Index

pub fn from(i: isize) -> Self

Performs the conversion.

impl From<usize> for Index

pub fn from(i: usize) -> Self

Performs the conversion.

impl PartialEq<Index> for Index

pub fn eq(&self, other: &Index) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl StructuralEq for Index

impl StructuralPartialEq for Index