Struct sp_runtime_interface::pass_by::Enum
source · pub struct Enum<T: Copy + Into<u8> + TryFrom<u8>>(/* private fields */);
Expand description
The implementation of the pass by enum strategy. This strategy uses an u8
internally to pass
the enum between wasm and the host. So, this strategy only supports enums with unit variants.
Use this type as associated type for PassBy
to implement this strategy for a type.
This type expects the type that wants to implement this strategy as generic parameter. Besides
that the type needs to implement TryFrom<u8>
and From<Self> for u8
.
PassByEnum
is a derive macro to implement this strategy.
§Example
#[derive(Clone, Copy)]
enum Test {
Test1,
Test2,
}
impl From<Test> for u8 {
fn from(val: Test) -> u8 {
match val {
Test::Test1 => 0,
Test::Test2 => 1,
}
}
}
impl TryFrom<u8> for Test {
type Error = ();
fn try_from(val: u8) -> Result<Test, ()> {
match val {
0 => Ok(Test::Test1),
1 => Ok(Test::Test2),
_ => Err(()),
}
}
}
impl PassBy for Test {
type PassBy = Enum<Self>;
}
Trait Implementations§
source§impl<T: Copy + Into<u8> + TryFrom<u8>> PassByImpl<T> for Enum<T>
impl<T: Copy + Into<u8> + TryFrom<u8>> PassByImpl<T> for Enum<T>
source§fn into_ffi_value(
instance: T,
_: &mut dyn FunctionContext,
) -> Result<Self::FFIType>
fn into_ffi_value( instance: T, _: &mut dyn FunctionContext, ) -> Result<Self::FFIType>
Convert the given instance to the ffi value. Read more
source§fn from_ffi_value(_: &mut dyn FunctionContext, arg: Self::FFIType) -> Result<T>
fn from_ffi_value(_: &mut dyn FunctionContext, arg: Self::FFIType) -> Result<T>
Create
T
from the given ffi value. Read moreAuto Trait Implementations§
impl<T> Freeze for Enum<T>
impl<T> RefUnwindSafe for Enum<T>where
T: RefUnwindSafe,
impl<T> Send for Enum<T>where
T: Send,
impl<T> Sync for Enum<T>where
T: Sync,
impl<T> Unpin for Enum<T>where
T: Unpin,
impl<T> UnwindSafe for Enum<T>where
T: UnwindSafe,
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source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
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source§impl<T> FmtForward for T
impl<T> FmtForward for T
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Self: Binary,
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Self: Binary,
Causes
self
to use its Binary
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-formatted.source§fn fmt_display(self) -> FmtDisplay<Self>where
Self: Display,
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Self: Display,
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Debug
-formatted.source§fn fmt_lower_exp(self) -> FmtLowerExp<Self>where
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-formatted.source§fn fmt_lower_hex(self) -> FmtLowerHex<Self>where
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Self: UpperExp,
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-formatted.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
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 moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
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self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
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T: ?Sized,
impl<T> Pipe for Twhere
T: ?Sized,
source§fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> Rwhere
Self: Sized,
fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> Rwhere
Self: Sized,
Pipes by value. This is generally the method you want to use. Read more
source§fn pipe_ref<'a, R>(&'a self, func: impl FnOnce(&'a Self) -> R) -> Rwhere
R: 'a,
fn pipe_ref<'a, R>(&'a self, func: impl FnOnce(&'a Self) -> R) -> Rwhere
R: 'a,
Borrows
self
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Mutably borrows
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&'a mut self,
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