Enum rustpython_vm::function::OptionalArg

pub enum OptionalArg<T = PyObjectRef> {
    Present(T),
    Missing,
}

An argument that may or may not be provided by the caller.

This style of argument is not possible in pure Python.

Variants

Present(T)

Missing

Methods

impl<T> OptionalArg<T>

pub fn is_present(&self) -> bool

pub fn into_option(self) -> Option<T>

pub fn unwrap_or(self, default: T) -> T

pub fn unwrap_or_else<F>(self, f: F) -> T where
    F: FnOnce() -> T, 

pub fn map_or_else<U, D, F>(self, default: D, f: F) -> U where
    D: FnOnce() -> U,
    F: FnOnce(T) -> U, 

Trait Implementations

impl<T> FromArgs for OptionalArg<T> where
    T: TryFromObject, 

fn arity() -> RangeInclusive<usize>

The range of positional arguments permitted by the function signature.

fn from_args(
    vm: &VirtualMachine,
    args: &mut PyFuncArgs
) -> Result<Self, ArgumentError>

Extracts this item from the next argument(s).

impl<T: Debug> Debug for OptionalArg<T>

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

Formats the value using the given formatter.