A Rust library for writing smart contracts for the Casper Blockchain.

Example

The following example is a simple counter smart contract. The contract stores a single value, which can be incremented or decremented. The counter value can be initialized at contract creation time.

use odra::prelude::*;

#[odra::module]
struct Counter {
count: odra::Var<u32>,
}

#[odra::module]
impl Counter {
pub fn init(&mut self, count: u32) {
self.count.set(count);
}

pub fn increment(&mut self) {
self.count.set(self.count.get_or_default() + 1);
}

pub fn decrement(&mut self) {
self.count.set(self.count.get_or_default() - 1);
}

pub fn get_count(&self) -> u32 {
self.count.get_or_default()
}
}

# fn main() {}