Struct Expr 

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

A cheap, immutable handle to a shared symbolic expression node.

Implementations

impl Expr

pub fn node(&self) -> &ExprNode

pub fn node_identity(&self) -> ExprNodeId

Identity of this allocation for operation-local DAG memoization. The value is process-local and remains valid while any clone of the node lives.

pub fn integer(value: impl Into<BigInt>) -> Expr

pub fn rational( numerator: impl Into<BigInt>, denominator: impl Into<BigInt>, ) -> Expr

pub fn constant(value: Ratio<BigInt>) -> Expr

pub fn variable(name: impl Into<Box<str>>) -> Expr

pub fn try_variable(name: impl Into<Box<str>>) -> Result<Expr, InvalidSymbol>

pub fn pow(base: Expr, exponent: Expr) -> Expr

pub fn exp(value: Expr) -> Expr

pub fn log(value: Expr) -> Expr

pub fn sqrt(value: Expr) -> Expr

pub fn factorial(value: Expr) -> Expr

pub fn parse(input: &str) -> Expr

pub fn try_parse(input: &str) -> Result<Expr, ParseError>

pub fn variables(&self) -> BTreeSet<&str>

pub fn substitute_complete( &self, replacements: &HashMap<&str, &Expr>, ) -> Result<Expr, SubstitutionError>

Replace every variable or report the complete set of missing replacements.

pub fn is_constant(&self) -> bool

pub fn is_polynomial(&self) -> bool

pub fn is_valid_complexity_notation(&self) -> bool

pub fn unique_node_count(&self) -> usize

Trait Implementations

impl Add for Expr

type Output = Expr

The resulting type after applying the + operator.

fn add(self, rhs: Expr) -> <Expr as Add>::Output

Performs the + operation.

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Expr

fn deserialize<D>( deserializer: D, ) -> Result<Expr, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Expr

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

Formats the value using the given formatter.

impl Div for Expr

type Output = Expr

The resulting type after applying the / operator.

fn div(self, rhs: Expr) -> <Expr as Div>::Output

Performs the / operation.

impl Eq for Expr

impl Hash for Expr

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

where H: Hasher,

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 Mul for Expr

type Output = Expr

The resulting type after applying the * operator.

fn mul(self, rhs: Expr) -> <Expr as Mul>::Output

Performs the * operation.

impl Neg for Expr

type Output = Expr

The resulting type after applying the - operator.

fn neg(self) -> <Expr as Neg>::Output

Performs the unary - operation.

impl Ord for Expr

fn cmp(&self, other: &Expr) -> 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 Expr

fn eq(&self, other: &Expr) -> 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 Expr

fn partial_cmp(&self, other: &Expr) -> 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 Serialize for Expr

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl Sub for Expr

type Output = Expr

The resulting type after applying the - operator.

fn sub(self, rhs: Expr) -> <Expr as Sub>::Output

Performs the - operation.