Struct Var

pub struct Var(/* private fields */);

A variable for use in Patterns or Substs.

This implements FromStr, and will only parse if it has a leading ?.

Implementations

impl Var

pub fn from_u32(num: u32) -> Self

Create a new variable from a u32.

You can also use special syntax ?#3, ?#42 to denote a numeric variable. These avoid some symbol interning, and can also be created manually from using this function or the From impl.

assert_eq!(Var::from(12), "?#12".parse().unwrap());
assert_eq!(Var::from_u32(12), "?#12".parse().unwrap());

pub fn as_u32(&self) -> Option<u32>

If this variable was created from a u32, get it back out.

Trait Implementations

impl Clone for Var

fn clone(&self) -> Var

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Var

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

Formats the value using the given formatter.

impl Display for Var

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

Formats the value using the given formatter.

impl From<u32> for Var

fn from(num: u32) -> Self

Converts to this type from the input type.

impl FromStr for Var

type Err = VarParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Var

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 Index<Var> for Subst

type Output = Id

The returned type after indexing.

fn index(&self, var: Var) -> &Self::Output

Performs the indexing (container[index]) operation.

impl Ord for Var

fn cmp(&self, other: &Var) -> 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 PartialEq for Var

fn eq(&self, other: &Var) -> 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 PartialOrd for Var

fn partial_cmp(&self, other: &Var) -> 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 Copy for Var

impl Eq for Var

impl StructuralPartialEq for Var