Enum amplify_syn::ValueReq[][src]

pub enum ValueReq {
    Required,
    Default(ArgValue),
    Optional,
    Prohibited,
}
Expand description

Requirements for attribute or named argument value presence for a values with known class. If the value class is not known, use ArgValueReq instead.

Variants

Required

Argument or an attribute must hold a value

Default

Argument or an attribute must hold a value; if the value is not present it will be substituted for the default value provided as the inner field

Tuple Fields of Default

0: ArgValue
Optional

Argument or an attribute may or may not hold a value

Prohibited

Argument or an attribute must not hold a value

Implementations

Detects if the presence of the value is required

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

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.