Struct odra_core::External

pub struct External<T: ContractRef> { /* private fields */ }

A module component that is a reference to an external contract.

Example

use core::ops::DerefMut;
use odra::{Address, External, prelude::*};

#[odra::module]
pub struct Contract {
    ext: odra::External<SetterGetterContractRef>
}

#[odra::module]
impl Contract {
    pub fn init(&mut self, address: odra::Address) {
        self.ext.set(address);
    }

    /// If a contract implements the set() method, you can't use
    /// the deref coercion mechanism, so you call the `External::set()` method.
    /// In this case you need to dereference the contract explicitly:
    pub fn set(&mut self, value: bool) {
        self.ext.deref_mut().set(value);
        // or
        // DerefMut::deref_mut(&mut self.ext).set(value);
    }

    /// For any other method, you can use the deref coercion mechanism, and call
    /// the method directly on the external instance:
    pub fn get(&self) -> bool {
        self.ext.get()
    }
}

#[odra::external_contract]
pub trait SetterGetter {
    fn set(&mut self, value: bool);
    fn get(&self) -> bool;
}

Implementations

impl<T: ContractRef> External<T>

pub fn set(&mut self, address: Address)

Sets the address of the external contract.

Trait Implementations

impl<T: ContractRef> Deref for External<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T: ContractRef> DerefMut for External<T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<T: ContractRef> ModuleComponent for External<T>

fn instance(env: Rc<ContractEnv>, index: u8) -> Self

Creates a new instance of External with the given environment and index.

impl<T: ContractRef> ModulePrimitive for External<T>