Trait Evaluatable 

pub trait Evaluatable {
    // Required method
    fn eval(
        &self,
        shell: &mut Shell<impl ShellExtensions>,
    ) -> Result<i64, EvalError>;
}

Trait implemented by evaluatable arithmetic expressions.

Required Methods

fn eval( &self, shell: &mut Shell<impl ShellExtensions>, ) -> Result<i64, EvalError>

Evaluate the given arithmetic expression, returning the resulting numeric value.

Arguments

• shell - The shell to use for evaluation.

Errors

• EvalError::DivideByZero on division or remainder by zero.
• EvalError::NegativeExponent on a negative exponent.
• EvalError::RecursionLimitExceeded when variable references nest too deeply.
• EvalError::ExpandingUnsetVariable when an unset variable is referenced under set -u.
• EvalError::FailedToAccessArray or EvalError::FailedToUpdateEnvironment when an array element or variable cannot be read or assigned.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Evaluatable for ArithmeticExpr