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

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

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

`type LifetimeDef`[src]

`type ConstParam`[src]

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Provided methods

`pub fn as_type_param(&self) -> Option<&Self::TypeParam>`[src]

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

`pub fn as_lifetime_def(&self) -> Option<&Self::LifetimeDef>`[src]

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

`pub fn as_const_param(&self) -> Option<&Self::ConstParam>`[src]

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 = ()`

`pub fn as_type_param( &self ) -> Option<&<TypeParam as GenericParamExt>::TypeParam>`[src]

`impl GenericParamExt for GenericParam`[src]

`type TypeParam = TypeParam`

`type LifetimeDef = LifetimeDef`

`type ConstParam = ConstParam`

`pub fn as_type_param( &self ) -> Option<&<GenericParam as GenericParamExt>::TypeParam>`[src]

`pub fn as_lifetime_def( &self ) -> Option<&<GenericParam as GenericParamExt>::LifetimeDef>`[src]

`pub fn as_const_param( &self ) -> Option<&<GenericParam as GenericParamExt>::ConstParam>`[src]

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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`

`pub fn as_type_param(&self) -> Option<&T>`[src]

`pub fn as_lifetime_def(&self) -> Option<&L>`[src]

`pub fn as_const_param(&self) -> Option<&C>`[src]

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