Enum amplify_syn::ListReq[][src]

pub enum ListReq<T> where
    T: Clone
{ Single { whitelist: Option<Vec<T>>, default: Option<T>, }, Many { whitelist: Option<Vec<T>>, required: bool, max_no: Option<u8>, }, Predefined { whitelist: Option<Vec<T>>, default: Vec<T>, }, Deny, }

Requirements for list elements. For instance, used in AttrReq for providing [ParametrizedAttr] fields requirements.

Variants

Single

Only a single value allowed and it must be present

Show fields

Fields of Single

whitelist: Option<Vec<T>>

Restricts set of possible values to the given whitelist

NB: If whitelist does not contain values from the default field, they are still accepted as valid, i.e. “automatically whitelisted”

default: Option<T>

Default value assigned as a signe list item if no values are provided

NB: If whitelist does not contain values from the default field, they are still accepted as valid, i.e. “automatically whitelisted”

Many

Any number of any elements may be present

Show fields

Fields of Many

whitelist: Option<Vec<T>>

Restricts set of possible values to the given whitelist

required: bool

Require that at least one value is present

max_no: Option<u8>

Restricts the maximum number of items

Predefined

Any number of any elements may not be present; if none of the elements is present the list will use default vec of the values

Show fields

Fields of Predefined

whitelist: Option<Vec<T>>

Restricts set of possible values to the given whitelist.

NB: If whitelist does not contain values from the default field, they are still accepted as valid, i.e. “automatically whitelisted”

default: Vec<T>

Default set of values for the list used if no values are provided

NB: If whitelist does not contain values from the default field, they are still accepted as valid, i.e. “automatically whitelisted”

Deny

Element must not be present

Implementations

impl<T> ListReq<T> where
    T: Clone + ToTokens
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pub fn check(
    &self,
    value: &mut Vec<T>,
    attr: impl ToString,
    arg: impl ToString
) -> Result<(), Error>
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Checks the value against the list requirements, generating Error if the requirements are not met.

Trait Implementations

impl<T: Clone> Clone for ListReq<T> where
    T: Clone
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Auto Trait Implementations

impl<T> RefUnwindSafe for ListReq<T> where
    T: RefUnwindSafe

impl<T> Send for ListReq<T> where
    T: Send

impl<T> Sync for ListReq<T> where
    T: Sync

impl<T> Unpin for ListReq<T> where
    T: Unpin

impl<T> UnwindSafe for ListReq<T> where
    T: UnwindSafe

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> ToOwned for T where
    T: Clone
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type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.