Struct cassowary::Expression

pub struct Expression {
    pub terms: Vec<Term>,
    pub constant: f64,
}

An expression that can be the left hand or right hand side of a constraint equation. It is a linear combination of variables, i.e. a sum of variables weighted by coefficients, plus an optional constant.

Fields

terms: Vec<Term>

constant: f64

Methods

impl Expression

fn from_constant(v: f64) -> Expression

Constructs an expression of the form n, where n is a constant real number, not a variable.

fn from_term(term: Term) -> Expression

Constructs an expression from a single term. Forms an expression of the form n x where n is the coefficient, and x is the variable.

fn new(terms: Vec<Term>, constant: f64) -> Expression

General constructor. Each Term in terms is part of the sum forming the expression, as well as constant.

fn negate(&mut self)

Mutates this expression by multiplying it by minus one.

Trait Implementations

impl BitOr<WeightedRelation> for Expression

type Output = PartialConstraint

The resulting type after applying the | operator

fn bitor(self, r: WeightedRelation) -> PartialConstraint

The method for the | operator

impl Add<Variable> for Expression

type Output = Expression

The resulting type after applying the + operator

fn add(self, v: Variable) -> Expression

The method for the + operator

impl Sub<Variable> for Expression

type Output = Expression

The resulting type after applying the - operator

fn sub(self, v: Variable) -> Expression

The method for the - operator

impl Add<Term> for Expression

type Output = Expression

The resulting type after applying the + operator

fn add(self, t: Term) -> Expression

The method for the + operator

impl Sub<Term> for Expression

type Output = Expression

The resulting type after applying the - operator

fn sub(self, t: Term) -> Expression

The method for the - operator

impl Mul<f64> for Expression

type Output = Expression

The resulting type after applying the * operator

fn mul(self, v: f64) -> Expression

The method for the * operator

impl Div<f64> for Expression

type Output = Expression

The resulting type after applying the / operator

fn div(self, v: f64) -> Expression

The method for the / operator

impl Add<f64> for Expression

type Output = Expression

The resulting type after applying the + operator

fn add(self, v: f64) -> Expression

The method for the + operator

impl Add<Expression> for Expression

type Output = Expression

The resulting type after applying the + operator

fn add(self, e: Expression) -> Expression

The method for the + operator

impl Neg for Expression

type Output = Expression

The resulting type after applying the - operator

fn neg(self) -> Expression

The method for the unary - operator

impl Sub<f64> for Expression

type Output = Expression

The resulting type after applying the - operator

fn sub(self, v: f64) -> Expression

The method for the - operator

impl Sub<Expression> for Expression

type Output = Expression

The resulting type after applying the - operator

fn sub(self, e: Expression) -> Expression

The method for the - operator

impl Clone for Expression

fn clone(&self) -> Expression

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Expression

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl From<f64> for Expression

fn from(v: f64) -> Expression

Performs the conversion.

impl From<Variable> for Expression

fn from(v: Variable) -> Expression

Performs the conversion.

impl From<Term> for Expression

fn from(t: Term) -> Expression

Performs the conversion.