Enum dharitri_wasm::types::OptionalArg

pub enum OptionalArg<T> {
    Some(T),
    None,
}

A smart contract argument or result that can be missing.

If arguments stop before this argument, None will be returned. As an endpoint result, the contract decides if it produces it or not.

As a principle, optional arguments or results should come last, otherwise there is ambiguity as to how to interpret what comes after.

Variants

Some(T)

None

Implementations

impl<T> OptionalArg<T>

pub fn into_option(self) -> Option<T>

Trait Implementations

impl<T> ContractCallArg for &OptionalArg<T>

where T: ContractCallArg,

fn push_async_arg(&self, serializer: &mut ArgBuffer) -> Result<(), SCError>

impl<T> ContractCallArg for OptionalArg<T>

where T: ContractCallArg,

fn push_async_arg(&self, serializer: &mut ArgBuffer) -> Result<(), SCError>

impl<T> DynArg for OptionalArg<T>

where T: DynArg,

fn dyn_load<I, D>(loader: &mut D, arg_id: ArgId) -> Self

where I: TopDecodeInput, D: DynArgInput<I>,

impl<FA, T> EndpointResult<FA> for OptionalArg<T>

where FA: EndpointFinishApi + Clone + 'static, T: EndpointResult<FA>,

fn finish(&self, api: FA)

impl<T> From<Option<T>> for OptionalArg<T>

fn from(v: Option<T>) -> Self

Converts to this type from the input type.

impl<T: TypeAbi> TypeAbi for OptionalArg<T>

fn type_name() -> String

fn provide_type_descriptions<TDC: TypeDescriptionContainer>( accumulator: &mut TDC )

A type can provide more than its own description. For instance, a struct can also provide the descriptions of the type of its fields. TypeAbi doesn’t care for the exact accumulator type, which is abstracted by the TypeDescriptionContainer trait.