Enum near_sdk::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::a("bob_near".parse().unwrap(), 0, Gas(1_000)).into()
};

Variants

Promise(Promise)

Value(T)

Trait Implementations

impl<T> BorshSchema for PromiseOrValue<T> where
    T: BorshSchema, 

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

Recursively, using DFS, add type definitions required for this type. For primitive types this is an empty map. Type definition explains how to serialize/deserialize a type.

fn declaration() -> Declaration

Get the name of the type without brackets.

fn add_definition(
    declaration: String,
    definition: Definition,
    definitions: &mut HashMap<String, Definition, RandomState>
)

Helper method to add a single type definition to the map.

fn schema_container() -> BorshSchemaContainer

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

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

fn try_to_vec(&self) -> Result<Vec<u8, Global>, Error>

Serialize this instance into a vector of bytes.

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

fn from(promise: Promise) -> Self

Converts to this type from the input 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.