Struct AllocateAndReturnByCodec

pub struct AllocateAndReturnByCodec<T>(/* private fields */);

(DEPRECATED) Return T into the runtime using the SCALE codec.

Encodes T using the SCALE codec, allocates runtime memory using the legacy allocator, copies the encoded payload into the runtime memory, and returns a fat pointer to it.

THIS STRATEGY IS DEPRECATED; DO NOT USE FOR NEW HOST FUNCTIONS!

Ideally use a mutable slice to return data to the guest, for example using the PassPointerAndWrite strategy.

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

Trait Implementations

impl<T: Encode> IntoFFIValue for AllocateAndReturnByCodec<T>

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

Convert Self::Inner into an FFI value.

impl<T> RIType for AllocateAndReturnByCodec<T>

type FFIType = u64

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

type Inner = T

The inner type without any serialization strategy wrapper.