Struct ConstInput 

pub struct ConstInput {}

An Input implementation that resolves nothing.

Use ConstInput when evaluating expressions that contain no external arguments or references (i.e., constant expressions).

Examples

use toasty_core::stmt::{ConstInput, Value, Expr};

let expr = Expr::from(Value::from(42_i64));
let result = expr.eval(ConstInput::new()).unwrap();
assert_eq!(result, Value::from(42_i64));

Implementations

impl ConstInput

pub fn new() -> ConstInput

Creates a new ConstInput.

Trait Implementations

impl Debug for ConstInput

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

Formats the value using the given formatter.

impl Default for ConstInput

fn default() -> ConstInput

Returns the “default value” for a type.

impl Input for ConstInput

fn resolve_arg( &mut self, expr_arg: &ExprArg, projection: &Projection, ) -> Option<Expr>

Resolves an argument expression at the given projection.

fn resolve_ref( &mut self, expr_reference: &ExprReference, projection: &Projection, ) -> Option<Expr>

Resolves a reference expression at the given projection.