Trait from_attr::ConvertParsed

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pub trait ConvertParsed: Sized {
    type Type;

    // Required method
    fn convert(path_value: PathValue<Self::Type>) -> Result<Self>;

    // Provided methods
    fn default() -> Option<Self> { ... }
    fn flag() -> Option<Self::Type> { ... }
}

Expand description

Helper trait to convert syn types implementing Parse like LitStr to rust types like String

You probably don’t need to implement this trait, as most syn types like LitStr and Type or that have a direct equivalent in those like String, char or f32 are already implemented. A special treatment have Vec which are parsed with the syntax [a, b, c].

Required Associated Types§

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type Type

The type this can be converted from

Required Methods§

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fn convert(path_value: PathValue<Self::Type>) -> Result<Self>

Convert the PathValue<Self::Type> to self.

Provided Methods§

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fn default() -> Option<Self>

Returns the value when this type is not specified.

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fn flag() -> Option<Self::Type>

Returns the value when this type is specified as flag.

Object Safety§

This trait is not object safe.

Trait from_attr::ConvertParsedCopy item path

Required Associated Types§

type Type

Required Methods§

fn convert(path_value: PathValue<Self::Type>) -> Result<Self>

Provided Methods§

fn default() -> Option<Self>

fn flag() -> Option<Self::Type>

Object Safety§

Implementations on Foreign Types§

impl ConvertParsed for TokenTree

type Type = TokenTree

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Meta

type Type = Meta

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Expr

type Type = Expr

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Member

type Type = Member

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for RangeLimits

type Type = RangeLimits

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for GenericParam

type Type = GenericParam

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for TraitBoundModifier

type Type = TraitBoundModifier

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for TypeParamBound

type Type = TypeParamBound

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for WherePredicate

type Type = WherePredicate

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for FnArg

type Type = FnArg

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for ForeignItem

type Type = ForeignItem

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for ImplItem

type Type = ImplItem

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Item

type Type = Item

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for TraitItem

type Type = TraitItem

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for UseTree

type Type = UseTree

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Lit

type Type = Lit

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for BinOp

type Type = BinOp

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for UnOp

type Type = UnOp

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Pat

type Type = Pat

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for GenericArgument

type Type = GenericArgument

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Visibility

type Type = Visibility

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Stmt

type Type = Stmt

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for ReturnType

type Type = ReturnType

fn convert(path_value: PathValue<Self>) -> Result<Self>

impl ConvertParsed for Type

Trait from_attr::ConvertParsed