Enum sp_wasm_interface::ReturnValue

pub enum ReturnValue {
    Unit,
    Value(Value),
}

Typed value that can be returned from a function.

Basically a TypedValue plus Unit, for functions which return nothing.

Variants

Unit

For returning nothing.

Value(Value)

For returning some concrete value.

Implementations

impl ReturnValue

pub const ENCODED_MAX_SIZE: usize

Maximum number of bytes ReturnValue might occupy when serialized with SCALE.

Breakdown: 1 byte for encoding unit/value variant 1 byte for encoding value type 8 bytes for encoding the biggest value types available in wasm: f64, i64.

Trait Implementations

impl Clone for ReturnValue

fn clone(&self) -> ReturnValue

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ReturnValue

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Decode for ReturnValue

fn decode<__CodecInputEdqy: Input>(
    __codec_input_edqy: &mut __CodecInputEdqy
) -> Result<Self, Error>

Attempt to deserialise the value from input.

fn skip<I>(input: &mut I) -> Result<(), Error> where
    I: Input, 

Attempt to skip the encoded value from input.

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

impl Encode for ReturnValue

fn encode_to<__CodecOutputEdqy: Output + ?Sized>(
    &self,
    __codec_dest_edqy: &mut __CodecOutputEdqy
)

Convert self to a slice and append it to the destination.

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding.

fn encode(&self) -> Vec<u8, Global>

Convert self to an owned vector.

fn using_encoded<R, F>(&self, f: F) -> R where
    F: FnOnce(&[u8]) -> R, 

Convert self to a slice and then invoke the given closure with it.

fn encoded_size(&self) -> usize

Calculates the encoded size.

impl From<Value> for ReturnValue

fn from(v: Value) -> ReturnValue

Performs the conversion.

impl PartialEq<ReturnValue> for ReturnValue

fn eq(&self, other: &ReturnValue) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &ReturnValue) -> bool

This method tests for !=.

impl Copy for ReturnValue

impl EncodeLike<ReturnValue> for ReturnValue

impl StructuralPartialEq for ReturnValue