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sp_runtime_interface::pass_by

Struct PassFatPointerAndRead

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pub struct PassFatPointerAndRead<T>(/* private fields */);
Expand description

Pass a value into the host by a fat pointer.

This casts the value into a &[u8] and passes a pointer to that byte blob and its length to the host. Then the host reads that blob and converts it into an owned type and passes it (either as an owned type or as a reference) to the host function.

Raw FFI type: u64 (a fat pointer; upper 32 bits is the size, lower 32 bits is the pointer)

Trait Implementations§

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impl<'a> FromFFIValue<'a> for PassFatPointerAndRead<&'a [u8]>

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type Owned = Vec<u8>

The owned inner type.
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fn from_ffi_value( context: &mut dyn FunctionContext, arg: Self::FFIType, ) -> Result<Self::Owned>

Creates Self::Owned from the given arg received through the FFI boundary from the runtime.
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fn take_from_owned(owned: &'a mut Self::Owned) -> Self::Inner

Creates Self::Inner from an owned value.
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fn write_back_into_runtime( _value: Self::Owned, _context: &mut dyn FunctionContext, _arg: Self::FFIType, ) -> Result<()>

Write back a modified value back into the runtime’s memory. Read more
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impl<'a> FromFFIValue<'a> for PassFatPointerAndRead<&'a str>

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type Owned = String

The owned inner type.
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fn from_ffi_value( context: &mut dyn FunctionContext, arg: Self::FFIType, ) -> Result<Self::Owned>

Creates Self::Owned from the given arg received through the FFI boundary from the runtime.
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fn take_from_owned(owned: &'a mut Self::Owned) -> Self::Inner

Creates Self::Inner from an owned value.
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fn write_back_into_runtime( _value: Self::Owned, _context: &mut dyn FunctionContext, _arg: Self::FFIType, ) -> Result<()>

Write back a modified value back into the runtime’s memory. Read more
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impl<'a> FromFFIValue<'a> for PassFatPointerAndRead<Vec<u8>>

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type Owned = Vec<u8>

The owned inner type.
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fn from_ffi_value( context: &mut dyn FunctionContext, arg: Self::FFIType, ) -> Result<Self::Owned>

Creates Self::Owned from the given arg received through the FFI boundary from the runtime.
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fn take_from_owned(owned: &'a mut Self::Owned) -> Self::Inner

Creates Self::Inner from an owned value.
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fn write_back_into_runtime( _value: Self::Owned, _context: &mut dyn FunctionContext, _arg: Self::FFIType, ) -> Result<()>

Write back a modified value back into the runtime’s memory. Read more
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impl<T> RIType for PassFatPointerAndRead<T>

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type FFIType = u64

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.

Auto Trait Implementations§

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impl<T> Freeze for PassFatPointerAndRead<T>

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impl<T> RefUnwindSafe for PassFatPointerAndRead<T>
where T: RefUnwindSafe,

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impl<T> Send for PassFatPointerAndRead<T>
where T: Send,

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impl<T> Sync for PassFatPointerAndRead<T>
where T: Sync,

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impl<T> Unpin for PassFatPointerAndRead<T>
where T: Unpin,

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impl<T> UnwindSafe for PassFatPointerAndRead<T>
where T: UnwindSafe,

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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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Immutably borrows from an owned value. Read more
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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Causes self to use its Display implementation when Debug-formatted.
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where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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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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where Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.borrow_mut() into the pipe function. Read more
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where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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const ALIGN: usize

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type Init = T

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unsafe fn init(init: <T as Pointable>::Init) -> usize

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