Enum Expr 

pub enum Expr {
    Const(f64),
    Var(String),
    Add(Box<Expr>, Box<Expr>),
    Mul(Box<Expr>, Box<Expr>),
    Pow(Box<Expr>, Box<Expr>),
    Neg(Box<Expr>),
    Sin(Box<Expr>),
    Cos(Box<Expr>),
    Exp(Box<Expr>),
    Ln(Box<Expr>),
}

A symbolic mathematical expression tree.

Each variant represents one kind of mathematical operation or atom.

Variants

Const(f64)

A numeric constant.

Var(String)

A named variable.

Add(Box<Expr>, Box<Expr>)

Addition of two sub-expressions.

Mul(Box<Expr>, Box<Expr>)

Multiplication of two sub-expressions.

Pow(Box<Expr>, Box<Expr>)

Exponentiation: base raised to exponent.

Neg(Box<Expr>)

Unary negation.

Sin(Box<Expr>)

Sine function.

Cos(Box<Expr>)

Cosine function.

Exp(Box<Expr>)

Natural exponential function.

Ln(Box<Expr>)

Natural logarithm.

Implementations

impl Expr

pub fn add_expr(self, rhs: Expr) -> Expr

Add another expression to self: self + rhs.

pub fn sub_expr(self, rhs: Expr) -> Expr

Subtract another expression from self: self + (-rhs).

pub fn mul_expr(self, rhs: Expr) -> Expr

Multiply self by another expression: self * rhs.

pub fn pow(self, exp: Expr) -> Expr

Raise self to the power of exp.

pub fn neg(self) -> Expr

Negate self: -self.

pub fn sin(self) -> Expr

Apply sine to self.

pub fn cos(self) -> Expr

Apply cosine to self.

pub fn exp(self) -> Expr

Apply the natural exponential to self.

pub fn ln(self) -> Expr

Apply the natural logarithm to self.

Trait Implementations

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

Formats the value using the given formatter.

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 StructuralPartialEq for Expr