[−][src]Trait darling::ast::GenericParamExt

pub trait GenericParamExt {
    type TypeParam;
    type LifetimeDef;
    type ConstParam;
    fn as_type_param(&self) -> Option<&Self::TypeParam> { ... }

    fn as_lifetime_def(&self) -> Option<&Self::LifetimeDef> { ... }

    fn as_const_param(&self) -> Option<&Self::ConstParam> { ... }
}

Extension trait for GenericParam to support getting values by variant.

Usage

darling::ast::Generics needs a way to test its params array in order to iterate over type params. Rather than require callers to use darling::ast::GenericParam in all cases, this trait makes that polymorphic.

Associated Types

type TypeParam

The type this GenericParam uses to represent type params and their bounds

type LifetimeDef

type ConstParam

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Provided methods

fn as_type_param(&self) -> Option<&Self::TypeParam>

If this GenericParam is a type param, get the underlying value.

fn as_lifetime_def(&self) -> Option<&Self::LifetimeDef>

If this GenericParam is a lifetime, get the underlying value.

fn as_const_param(&self) -> Option<&Self::ConstParam>

If this GenericParam is a const param, get the underlying value.

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Implementations on Foreign Types

impl GenericParamExt for TypeParam[src]

type TypeParam = TypeParam

type LifetimeDef = ()

type ConstParam = ()

impl GenericParamExt for GenericParam[src]

type TypeParam = TypeParam

type LifetimeDef = LifetimeDef

type ConstParam = ConstParam

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Implementors

impl<T, L, C> GenericParamExt for darling::ast::GenericParam<T, L, C>[src]

type TypeParam = T

type LifetimeDef = L

type ConstParam = C

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