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QueryDeriveExpandCtx

rustc_expand::proc_macro

Struct QueryDeriveExpandCtx 

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struct QueryDeriveExpandCtx {
    expansion_ctx: *mut (),
    client: Client<TokenStream, TokenStream>,
}
Expand description

Stores the context necessary to expand a derive proc macro via a query.

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§expansion_ctx: *mut ()

Type-erased version of &mut ExtCtxt

§client: Client<TokenStream, TokenStream>

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impl QueryDeriveExpandCtx

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fn enter<F, R>( ecx: &mut ExtCtxt<'_>, client: Client<TokenStream, TokenStream>, f: F, ) -> R
where F: FnOnce() -> R,

Store the extension context and the client into the thread local value. It will be accessible via the with method while f is active.

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fn with<F, R>(f: F) -> R
where F: for<'a, 'b> FnOnce(&'b mut ExtCtxt<'a>, Client<TokenStream, TokenStream>) -> R,

Accesses the thread local value of the derive expansion context. Must be called while the enter function is active.

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impl<T> Aligned for T

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const ALIGN: Alignment

Alignment of Self.
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fn borrow_mut(&mut self) -> &mut T

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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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fn from(t: T) -> T

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fn instrument(self, span: Span) -> Instrumented<Self>

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<P> IntoQueryParam<P> for P

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fn into_query_param(self) -> P

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type Error = !

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const ALIGN: usize

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type Init = T

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type Output = T

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impl<T> ErasedDestructor for T
where T: 'static,

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes