Enum ArgValueReq 

pub enum ArgValueReq {
    Required {
        default: Option<ArgValue>,
        class: ValueClass,
    },
    Optional(ValueClass),
    Prohibited,
}

Requirements for attribute or named argument value presence

Variants

Required

Argument must hold a value with the provided class

Fields

default: Option<ArgValue>

Default value

class: ValueClass

Type of the value literal

Optional(ValueClass)

Argument or an attribute may or may not hold a value

Prohibited

Argument or an attribute must not hold a value

Implementations

impl ArgValueReq

pub fn with_default(default: impl Into<ArgValue>) -> ArgValueReq

Constructs argument requirements object with default value

pub fn required(class: impl Into<ValueClass>) -> ArgValueReq

Construct ArgValueReq::Required variant with no default value

pub fn optional(class: impl Into<ValueClass>) -> ArgValueReq

Construct ArgValueReq::Optional variant

pub fn value_class(&self) -> Option<ValueClass>

Returns value class requirements, if any

pub fn default_value(&self) -> ArgValue

Returns default argument value. If not default is provided within the requirement, returns ArgValue::None (since this is de facto default value for any argument).

pub fn is_required(&self) -> bool

Determines whether argument is required to have a value

pub fn check( &self, value: &mut ArgValue, attr: impl ToString, arg: impl ToString, ) -> Result<(), Error>

Checks the argument against current requirements, generating Error if the requirements are not met.

Trait Implementations

impl Clone for ArgValueReq

fn clone(&self) -> ArgValueReq

Returns a duplicate of the value.

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

Performs copy-assignment from source.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 272 bytes

Size for each variant:

• Required: 272 bytes
• Optional: 10 bytes
• Prohibited: 0 bytes