sp_runtime_interface::pass_by

Struct ReturnAs

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pub struct ReturnAs<T, U>(/* private fields */);
Expand description

Return T through the FFI boundary by first converting it to U on the host’s side, and then converting it back to T in the runtime.

Raw FFI type: same as U’s FFI type

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impl<T, U> IntoFFIValue for ReturnAs<T, U>
where U: RIType + IntoFFIValue + Primitive, <U as RIType>::Inner: From<Self::Inner>,

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fn into_ffi_value( value: Self::Inner, context: &mut dyn FunctionContext, ) -> Result<Self::FFIType>

Convert Self::Inner into an FFI value.
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impl<T, U> RIType for ReturnAs<T, U>
where U: RIType,

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type FFIType = <U as RIType>::FFIType

The raw FFI type that is used to pass Self through the host <-> runtime boundary.
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type Inner = T

The inner type without any serialization strategy wrapper.

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impl<T, U> Freeze for ReturnAs<T, U>

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impl<T, U> RefUnwindSafe for ReturnAs<T, U>
where T: RefUnwindSafe, U: RefUnwindSafe,

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impl<T, U> Send for ReturnAs<T, U>
where T: Send, U: Send,

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impl<T, U> Sync for ReturnAs<T, U>
where T: Sync, U: Sync,

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impl<T, U> Unpin for ReturnAs<T, U>
where T: Unpin, U: Unpin,

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impl<T, U> UnwindSafe for ReturnAs<T, U>
where T: UnwindSafe, U: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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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.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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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.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> MaybeRefUnwindSafe for T
where T: RefUnwindSafe,