Enum PromiseOrValue

pub enum PromiseOrValue<T> {
    Promise(Promise),
    Value(T),
}

When the method can return either a promise or a value, it can be called with PromiseOrValue::Promise or PromiseOrValue::Value to specify which one should be returned.

Example

#[ext_contract]
pub trait ContractA {
    fn a(&mut self);
}

let value = Some(true);
let val: PromiseOrValue<bool> = if let Some(value) = value {
    PromiseOrValue::Value(value)
} else {
    contract_a::ext("bob_near".parse().unwrap()).a().into()
};

Variants

Promise(Promise)

Value(T)

Trait Implementations

impl<T> BorshSchema for PromiseOrValue<T>

where T: BorshSchema,

fn add_definitions_recursively( definitions: &mut BTreeMap<Declaration, Definition>, )

Recursively, using DFS, add type definitions required for this type. Type definition partially explains how to serialize/deserialize a type.

fn declaration() -> Declaration

Get the name of the type without brackets.

impl<T: BorshSerialize> BorshSerialize for PromiseOrValue<T>

fn serialize<W: Write>(&self, writer: &mut W) -> Result<(), Error>

impl<T> From<Promise> for PromiseOrValue<T>

fn from(promise: Promise) -> Self

Converts to this type from the input type.

impl<T: JsonSchema> JsonSchema for PromiseOrValue<T>

fn schema_name() -> String

The name of the generated JSON Schema.

fn json_schema(gen: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn is_referenceable() -> bool

Whether JSON Schemas generated for this type should be re-used where possible using the $ref keyword.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

impl<T> Serialize for PromiseOrValue<T>

where T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.