Struct ExprCast 

pub struct ExprCast {
    pub expr: Box<Expr>,
    pub from: Option<Type>,
    pub ty: Type,
}

A type cast expression.

Converts an expression’s value to a different type.

Examples

cast(x, i64)     // cast `x` to `i64`
cast(y, string)  // cast `y` to `string`

Fields

expr: Box<Expr>

The expression to cast.

from: Option<Type>

The source type, when the value alone cannot direct the conversion.

Most casts are directed by the target type and the value’s own shape, and leave this None. The exception is a #[document] column’s lowering cast (Type::Model → Type::Object): the structural target does not name the embedded model and a positional Value::Record is not self-describing, so the cast carries the model-level source type to resolve the embed’s field names.

ty: Type

The target type.

Trait Implementations

impl Clone for ExprCast

fn clone(&self) -> ExprCast

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExprCast

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

Formats the value using the given formatter.

impl From<ExprCast> for Expr

fn from(value: ExprCast) -> Self

Converts to this type from the input type.

impl PartialEq for ExprCast

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